NEWS.md
In reticulate: Interface to 'Python'

reticulate 1.34.0

reticulate 1.33.0

Fixed issue where asyncio, (and modules that use asyncio), would error on Windows when running under RStudio (#1478, #1479).
Added compatability with Python 3.12.
condaenv_exists() is now exported.

reticulate 1.32.0

reticulate now supports casting R data.frames to Pandas data.frames using nullable data types, allowing users to preserve NA's from R atomic vectors. This feature is opt-in and can be enabled by setting the R option reticulate.pandas_use_nullable_dtypes to TRUE. (#1439)
reticulate now exports a chooseOpsMethod() method, allowing for Ops dispatch to more specialized Ops methods defined for Python objects.
py_discover_config() will now warn instead of error upon encountering a broken Python installation. (#1441, #1459)
Fixed issue where Python would raise exception "OSError: [WinError 6] The handle is invalid" when opening a subprocess while running in Rstudio on Windows. (#1448, #518)
Fixed issue where the multiprocessing Python module would crash or hang when spawning a Process() on Windows. (#1430, #1346, fixed in #1461)
Fixed issue where virtualenv_create() would fail to discover a 'virtualenv' module in the system Python installation on Ubuntu. Reticulate will no longer discover and attempt to use the venv module stub present on Ubuntu systems where the python3-venv apt package has not been installed. (mlverse/pysparklyr#11, #1437, #1455)
Fixed issue where the user was prompted to create an 'r-reticulate' venv in the RStudio IDE before reticulate was requested to initialize Python. (#1450, #1456)
Improved error message when reticulate attempts to initialize a virtual environment after the Python installation it was created from is no longer available. (#1149, #1457)
Improved error message on Fedora when attempting to create a virtual environment from the system python before running dnf install python3-pip.
Fixed issue where install_python() on macOS in the RStudio IDE would fail to discover and use brew for Python build dependencies.
Fixed error with virtualenv_create(python = "/usr/bin/python") on centos7. (#1467)

reticulate 1.31

reticulate will no longer prompt users to install miniconda. Instead, reticulate will now prompt users to create a default r-reticulate venv.
The search that reticulate conducts to select which Python installation to load has changed. See the updated Python "Order of Discover" in the "versions" vignette. vignette("versions", package = "reticulate").
Updated recommendations in the "python_dependencies" vignette for how R packages can approach Python dependency management. vignette("python_dependencies", package = "reticulate")
New function virtualenv_starter(), which can be used to find a suitable python binary for creating a virtual environmnent. This is now the default method for finding the python binary when calling virtualenv_create(version = <version>).
virtualenv_create() and virtualenv_install() gain a requirements argument, accepting a filepath to a python requirements file.
virtualenv_create() gains a force argument.
virtualenv_install() gains a python_version argument, allowing users to customize which python version is used when bootstrapping a new virtual environment.
Fixed an issue where the list of available python versions used by install_python() would be out-of-date.
install_python() now gives a better error message if git is not installed.
install_python() on macOS will now will use brew, if it's available, to install build dependencies, substantially speeding up python build times.
New function conda_search(), contributed by @mkoohafkan in PR #1364.

New [ and [<- methods that invoke Python __getitem__, __setitem__ and __delitem__. The R generics [ and [<- now accept python-style slice syntax like x[1:2:3]. See examples in ?py_get_item.
py_iterator() gains a prefetch argument, primarily to avoid deadlocks where the main thread is blocked, waiting for the iterator, which is waiting to run on the main thread, as encountered in TensorFlow/Keras. (#1405).
String columns from Pandas data frames containing None, pd.NA or np.nan are now simplified into character vectors and missing values replaced by NA (#1428).
Converting from Pandas data frames containing columns with Pandas nullable data types are now correctly converted into R data.frames preserving the missing values (#1427).

The knitr engine gains a jupyter_compat option, enabling reticulate to better match the behavior of Jupyter. When this chunk option is set to TRUE, only the return value from the last expression in a chunk is auto-printed. (#1391, #1394, contributed by @matthew-brett)
The knitr engine now more reliably detects and displays matplotlib pending plots, without the need for a matplotlib artist object to be returned as a top-level expression. E.g., the knitr engine will now display plots when the matplotlib api returns something other than an artist object, (plt.bar()), or the matplotlib return value is not auto-printed due to being assigned, (x = plt.plot()), or suppressed with a ;, (plt.plot();). (#1391, #1401, contributed by @matthew-brett)
Fixed an issue where knitr engine would not respect chunk options fig.width / fig.height when rendering matplotlib plots. (#1398)
Fixed an issue where the reticulate knitr engine would not capture output printed from python. (PR #1412, fixing #1378, #331)

Reticulate now periodically flushes python stdout and stderr buffers even while the main thread is blocked executing Python code. Streaming output from a long-running Python function call will now appear in the R console while the Python function is still executing. (Previously, output might not appear until the Python function had finished and control of the main thread had returned to R).
Updated sparse matrix conversion routines for compatibility with scipy 1.11.0.
Fixed an issue where a py capsule finalizer could access the R API from a background thread. (#1406)
Fixed issue where R would segfault (crash) in long-lived R sessions where both rpy2 and reticulate were in use (#1236).
Fixed an issue where exceptions from reticulate would not be formatted properly when running tests under testthat (r-lib/rlang#1637, #1413).
Fixed an issue where py_get_attr(silent = TRUE) would not return an R NULL, if the attribute was missing, as documented. (#1413)
Fixed an issue where py_get_attr(silent = TRUE) would leave a python global exception set if the attribute was missing, resulting in fatal errors when running python under debug mode. (#1396)

reticulate 1.30

Fix compilation error on R 3.5. Bump minimum R version dependency to 3.5.

reticulate 1.29

R error information (call, message, other attributes) is now preserved as an R error condition traverses the R <-> Python boundary.
Python Exceptions now inherit from error and condition, and can be passed directly to base::stop() to signal an error in R and raise an exception in Python.
Raised Python Exceptions are now used directly to signal an R error. For example, in the following code, e is now an object that inherits from python.builtin.Exception as well as error and condition: r e <- tryCatch(py_func_that_raises_exception(), error = function(e) e) Use base::conditionCall() and base::conditionMessage() to access the original R call and error message.
py_last_error() return object contains r_call, r_trace and/or r_class if the Python Exception was raised by an R function called from Python.
The hint to run reticulate::py_last_error() after an exception is now clickable in the RStudio IDE.
Filepaths to Python files in the print output from py_last_error() are now clickable links in the RStudio IDE.
Python exceptions encountered in repl_python() are now printed with the full Python traceback by default. In the RStudio IDE, filepaths in the tracebacks are rendered as clickable links. (#1240)

Converted Python callables gain support for dynamic dots from the rlang package. New features:
- splicing (unpacking) arguments: fn(!!!kwargs)
- dynamic names: nm <- "key"; fn("{nm}" := value)
- trailing commas ignored (matching Python syntax): fn(a, ) identical to fn(a)
New Ops group generics for Python objects: +, -, *, /, ^, %%, %/%, &, |, !, %*%. Methods for all the Ops group generics are now defined for Python objects. (#1187, #1363) E.g., this now works: r np <- reticulate::import("numpy", convert = FALSE) x <- np$array(1:5) y <- np$array(6:10) x + y
Fixed two issues with R comparison operator methods (==, !=, <, <=, >=, >):
The operators no longer error on Python objects that define "rich comparison" Python methods that don't return a single bool. (e.g., numpy arrays).
The operators now respect the 'convert' value of the supplied Python objects. Note, this may be a breaking change as, e.g, ==, may now no long return an R scalar logical if one of the Python object being compared was created with convert = FALSE. Wrap the result of the comparison with py_bool() to restore the previous behavior. (#1187, #1363)
R functions wrapping Python callables now have formals matching those of the Python callable signature, enabling better autocompletion in more contexts (#1361).
new nameOfClass() S3 method for Python types, enabling usage: base::inherits(x, <python-type-object>) (requires R >= 4.3.0)
py_run_file() and source_python() now prepend the script directory to the Python module search path, sys.path, while the requested script is executing. This allows the Python scripts to resolve imports of modules defined in the script directory, matching the behavior of python <script> at the command line. (#1347)

The knitr engine now suppresses warnings from Python code if warning=FALSE is set in the chunk options. (quarto-dev/quarto#125, #1358)
Fixed issue where reticulate's knitr engine would attach comments in a code chunk to the wrong code chunk (requires Python>=3.8) (#1223).
The knitr Python engine now respects the strip.white option (#1273).
Fixed issue where the knitr engine would show an additional plot from a chunk if the user called matplotlib.pyplot.show() (#1380, #1383)

py_to_r() now succeeds when converting subtypes of the built-in types (e.g. list, dict, str). (#1352, #1348, #1226, #1354, #1366)
New pillar::type_sum() method now exported for Python objects. That ensures the full object class name is printing in R tracebacks and tibbles containing Python objects.
py_load_object() gains a convert argument. If convert = FALSE, the returned Python object will not be converted to an R object.
Fixed error r_to_py() with Pandas>=2.0 and R data.frames with a factor column containing levels with NA.
r_to_py() now succeeds for many additional types of R objects. Objects that reticulate doesn't know how to convert are presented to the Python runtime as a pycapsule (an opaque pointer to the underlying R object). Previously this would error. This allows for R code to pass R objects that cannot be safely converted to Python through the Python runtime to other R code. (e.g, to an R function called by Python code). (#1304)
reticulate gains the ability to bind to micromamba Python installations (#1378, #1176, #1382, #1379, thanks to Zia Khan, @zia1138)
Default Python version used by install_miniconda() and friends is now 3.9 (was 3.8).

reticulate 1.28

Fixed issue where source_python() (and likely many other entrypoints) would error if reticulate was built with Rcpp 1.0.10. Exception and error handling has been updated to accommodate usage of R_ProtectUnwind(). (#1328, #1329).
Fixed issue where reticulate failed to discover Python 3.11 on Windows. (#1325)
Fixed issue where reticulate would error by attempting to bind to a cygwin/msys2 installation of Python on Windows (#1325).

reticulate 1.27

py_run_file() now ensures the __file__ dunder is visible to the executing python code. (#1283, #1284)
Fixed errors with install_miniconda() and conda_install(), on Windows (#1286, #1287, conda/conda#11795, #1312, #1297), and on Linux and macOS (#1306, conda/conda#10431)
Fixed error when activating a conda env from a UNC drive on Windows (#1303).

reticulate 1.26

Fixed issue where reticulate failed to bind to python2. (#1241, #1229)
A warning is now issued when reticulate binds to python2 that python2 support will be removed in an upcoming reticulate release.
py_id() now returns a character string, instead of an R integer (#1216).
Fixed an issue where py_to_r() would not convert elements of a dictionary (#1221).
Fixed an issue where setting RETICULATE_PYTHON or RETICULATE_PYTHON_FALLBACK on Windows to the pyenv-win python.bat shim would result in an error (#1263).
Fixed an issue where datetime.datetime objects with a tzinfo attribute was not getting converted to R correctly (#1266).
Fixed an issue where pandas pandas.Categorical(,ordered=True) Series were not correctly converted to an R ordered factor (#1234).
The reticulate Python engine no longer halts on error for Python chunks containing parse errors when the error=TRUE chunk option is set. (#583)
install_python() now leverages brew for python build dependencies like openssl@1.1 if brew is already installed and on the PATH, substantially speeding up install_python() on macOS systems with brew configured.
Fixed an issue where reticulate would fail to bind to a conda environment on macOS or linux if conda installed a non-POSIX compliant activation script into the conda environment. (#1255)
Fixed an issue where the python knitr engine would error when printing to HTML a constructor of class instances with a _repr_html_ or to_html method (e.g., pandas.DataFrame; #1249, #1250).
Fixed an issue where the python knitr engine would error when printing a plotly figure to an HTML document in some (head-less) linux environments (#1250).
Fixed an issue where conda_install(pip=TRUE) would install packages into a user Python library instead of the conda env if the environment variable PIP_USER=true was set. py_install(), virtualenv_install(), and conda_install() now always specify --no-user when invoking pip install. (#1209)
Fixed issue where py_last_error() would return unconverted Python objects (#1233)
The Knitr engine now supports printing Python objects with _repr_markdown_ methods. (via quarto-dev/quarto-cli#1501)
sys.executable on Windows now correctly reports the path to the Python executable instead of the launching R executable. (#1258)
The sys module is no longer automatically imported in __main__ by reticulate.
Fixed an issue on Windows where reticulate would fail to find Python installations from pyenv installed via scoop.
Fixed an issue where configure_environment() would error on Windows. (#1247)
Updated docs for compatibility with HTML5 / R 4.2.
Updated r_to_py.sparseMatrix() method for compatibility with Matrix 1.4-2.

reticulate 1.25

Fixed an issue where reticulate would fail if R was running embedded under rpy2. reticulate now ensures the Python GIL is acquired before calling into Python. (#1188, #1203)
Fixed an issue where reticulate would fail to bind to an ArcGIS Pro conda environment (#1200, @philiporlando).
Fixed an issue where reticulate would fail to bind to an Anaconda base environment on Windows.
All commands that create, modify, or delete a Python environment now echo the system command about to be executed. Affected: virtualenv_{create,install,remove} conda_{create,clone,remove,install,update} py_install
install_python() and create_virtualenv() gain the ability to automatically select the latest patch of a requested Python version. e.g.: install_python("3.9:latest"), create_virtualenv("my-env", version = "3.9:latest")
install_python() version arg gains default value of "3.9:latest". install_python() can now be called with no arguments.
Fixed an issue where reticulate would fail to bind to a conda python if the user didn't have write permissions to the conda installation (#1156).
Fixed an issue where reticulate would fail to bind to a conda python if spaces were present in the file path to the associated conda binary (#1154).
use_python(, required = TRUE) now issues a warning if the request will be ignored (#1150).
New function py_repr() (#1157)
print() and related changes (#1148, #1157):
The default print() method for Python objects now invokes py_repr() instead of str().
All Python objects gain a default format() method that invokes py_str().
py_str() default method no longer strips the object memory address.
print() now returns the printed object invisibly, for composability with %>%.
Exception handling changes (#1142, @t-kalinowski):
R error messages from Python exceptions are now truncated differently to satisfy getOption("warning.length"). A hint to call reticulate::py_last_error() is shown if the exception message was truncated.
Python buffers sys.stderr and sys.stdout are now flushed when Python exceptions are raised.

-py_last_error(): * Return object is now an S3 object 'py_error', includes a default print method. * The python Exception object ('python.builtin.Exception') is available as an R attribute. * Gains the ability to restore a previous exception if provided in a call py_last_error(previous_error)

Python traceback objects gain a default format() S3 method.
Fixed py_to_r() for scipy matrices when scipy >= 1.8.0, since sparse matrices are now deprecated.
Fixed r_to_py() for small scipy matrices.
New maintainer: Tomasz Kalinowski

reticulate 1.24

Fixed an issue where reticulate would fail to bind to the system version of Python on macOS if command line tools were installed, but Xcode was not.

reticulate 1.23

use_condaenv() gains the ability to accept an absolute path to a python binary for envname.
All python objects gain a length() method, that returns either py_len(x), or if that fails, as.integer(py_bool(x)).
conda_create() default for python_version changed from NULL to miniconda_python_version() (presently, 3.8).
New function py_bool(), for evaluating Python "truthiness" of an object.
reticulate gains the function py_list_packages(), and can be used to list the Python modules available and installed in a particular Python environment. (#933)
reticulate now supports conversion of Python datatable objects. (#1081)
repl_python() gains support for invoking select magic and system commands like !ls and %cd <dir>. See ?repl_python() for details and examples.
The development branch for reticulate has moved to the "main" branch.
reticulate gains reticulate::conda_update(), for updating the version of conda in a particular conda installation.
reticulate gains reticulate::miniconda_uninstall(), for uninstalling the reticulate-managed version of Miniconda. (#1077)
reticulate::use_python() and friends now assume required = TRUE by default. For backwards compatibility, when use_python() is called as part of a package load hook, the default value will instead be FALSE.
reticulate now provides support for Python environments managed by poetry. For projects containing a pyproject.toml file, reticulate will attempt to find and use the virtual environment managed by Poetry for that project. (#1031)
The default version of Python used for the r-reticulate Miniconda environment installed via reticulate::install_miniconda() has changed from 3.6 to 3.8.
reticulate::install_miniconda() now prefers installing the latest arm64 builds of miniforge. See https://conda-forge.org/blog/posts/2020-10-29-macos-arm64/ for more details.
reticulate::conda_create() gains the environment argument, used when creating a new conda environment based on an exported environment definition (e.g. environment.yml or environment.json).
reticulate gains the function, conda_export(), for exporting a conda environment definition as YAML. Environments are exported as via the conda env export command. (#779)
reticulate::find_conda() will now locate miniforge Conda installations located within the default install locations.
Fixed an issue that caused reticulate::conda_install(pip = TRUE) to fail on windows. (#1053, @t-kalinowski)

reticulate 1.22

Fixed a regression that caused reticulate::conda_install(pip = TRUE) to fail. (#1052)

reticulate 1.21

use_condaenv("base") can now be used to activate the base Anaconda environment.
reticulate will now execute any hooks registered via setHook("reticulate.onPyInit", <...>) after Python has been initialized. This can be useful for packages that need to take some action after reticulate has initialized Python.
Further refined interrupt handling.
Fixed an issue where attempting to bind reticulate to /usr/bin/python3 on macOS could fail if Xcode was not installed. (#1017)
The reticulate Python REPL no longer exits when a top-level interrupt is sent (e.g. via Ctrl + C).
The miniconda auto-installer now supports aarch64 Linux machines. (#1012)
Fixed an issue where matplotlib plots were incorrectly overwritten when multiple Python chunks in the same R Markdown document included plot output. (#1010)
reticulate can now use the version of Python configured in projects using pipenv. If the project contains a Pipfile at the root directory (as understood by here::here()), then reticulate will invoke pipenv --venv to determine the path to the Python virtual environment associated with the project. Note that the RETICULATE_PYTHON environment variable, as well as usages of use_python(..., force = TRUE), will still take precedence. (#1006)
Fixed an issue where reticulate::py_run_string(..., local = TRUE) failed to return the dictionary of defined Python objects in some cases.

reticulate 1.20

Fixed an issue causing tests to fail on CRAN's M1mac machine.

reticulate 1.19

Fixed an issue where reticulate's interrupt handlers could cause issues with newer versions of Python.
reticulate now better handles Pandas categorical variables containing NA values. (#942)
reticulate now supports converting pandas.NA objects into R NA objects. (#950)
reticulate now sets the PYTHONIOENCODING environment variable to UTF-8 when running within RStudio. This should allow UTF-8 input and output to be handled more appropriately.
reticulate gains the install_python() function, used to install different versions of Python via pyenv (pyenv-windows on Windows).
Interrupt signals (e.g. those generated by Ctrl + C) are now better handled by reticulate. In particular, when repl_python() is active, Ctrl + C can be used to interrupt a pending Python computation.
virtualenv_create() gains the pip_version and setuptools_version arguments, allowing users to control the versions of pip and setuptools used when initializing the virtual environment. The extra argument can also now be used to pass arbitrary command line arguments when necessary.
virtualenv_create() gains the module argument, used to control whether virtualenv or venv is used to create the requested virtual environment.
py_to_r.datetime.datetime no longer errs when tzname is NULL, and instead assumes the time is formatted for UTC. (#876)
reticulate now supports the rendering of plotly plots and Altair charts in rendered R Markdown documents. (#711)
reticulate now avoids invoking property methods when inferring the type for Python class members, for auto-completion systems. (#907)
reticulate now attempts to set the QT_QPA_PLATFORM_PLUGIN_PATH environment variable when initializing a Conda installation of Python, when that associated plugins directory exists. (#586)
The reticulate Python engine now supports the results = "hold" knitr chunk option. When set, any generated outputs are "held" and then displayed after the associated chunk's source code. (#530)
conda_create() gains the python_version argument, making it easier to request that Conda environments are created with a pre-specified version of Python. (#766)
Fixed an issue where reticulate::conda_install() would attempt to re-install the default Python package, potentially upgrading or downgrading the version of Python used in an environment.
Fixed an issue where reticulate invoked its reticulate.initialized hook too early.
Fixed an issue where Python modules loaded on a separate thread could cause a crash. (#885)
conda_install() now allows version specifications for the python_version argument; e.g. conda_install(python_version = ">=3.6"). (#880)
Fixed an issue where conda_install() failed to pass along forge and channel in calls to conda_create(). (#878)
Fixed an issue where Python's auto-loader hooks could fail when binding to a Python 2.7 installation.

reticulate 1.18

Fixed an issue where python_config() could throw an error when attempting to query information about a Python 2.6 installation.

reticulate 1.17

reticulate now checks for and disallows installation of Python packages during R CMD check.
reticulate no longer injects the r helper object into the main module if another variable called r has already been defined.
The function py_help_handler() has now been exported, to be used by front-ends and other tools which need to provide help for Python objects in different contexts. (#864)
Fixed an issue where timezone information could be lost when converting Python datetime objects to R. (#829)
Fixed an issue where numeric (rather than integer) dimensions could cause issues when converting SciPy sparse matrices to their R counterparts. (#844)
Fixed an issue where R data.frames with non-ASCII column names could not be converted to Pandas DataFrames. (#834)
Fixed an issue where the pip_ignore_installed argument in conda_install() was silently being ignored.
Fixed an issue where reticulate::conda_install() could re-install Python into an environment when not explicitly requested by the user.
reticulate now sets LD_LIBRARY_PATH when discovering Python. (#836)
reticulate is now better at capturing Python logger streams (those that write to stdout or stderr) when py_capture_output() is set. (#825)
reticulate no longer calls utils::loadhistory() after each REPL iteration.
reticulate now better detects when Python modules are loaded.
reticulate::import_from_path() now accepts the delay_load parameter, allowing modules which should be loaded from a pre-specified path to be lazy-loaded.
Fixed an issue where reticulate load hooks (normally defined via setHook("reticulate::<module>::load", ...)) would segfault if those hooks attempted to load the hooked module.
reticulate now attempts to resolve the conda binary used to create the associated Conda environment in calls to py_install(). This should fix use cases where Conda environments are placed outside of the Conda installation itself.
reticulate now sets PYTHONPATH before loading Python, to ensure modules are looked up in the same locations where a regular Python interpreter would find them on load. This should fix issues where reticulate was unable to bind to a Python virtual environment in some cases.
reticulate::virtualenv_create() gains the packages argument, allowing one to choose a set of packages to be installed (via pip install) after the virtual environment has been created.
reticulate::virtualenv_create() gains the system_site_packages argument, allowing one to control whether the --system-site-packages flag is passed along when creating a new virtual environment. The default value can be customized via the "reticulate.virtualenv.system_site_packages" option and now defaults to FALSE when unset.
Fixed an issue where reticulate::configure_environment() would fail when attempting to configure an Anaconda environment. (#794)
reticulate now avoids presenting a Miniconda prompt for interactive sessions during R session initialization.
Fixed unsafe usages of Rprintf() and REprintf().
reticulate::py_install() better respects the method argument, when py_install() is called without an explicit environment name. (#777)
reticulate:::pip_freeze() now better handles pip direct references. (#775)
Fixed an issue where output generated from repl_python() would be buffered until the whole submitted command had completed. (#739, @randy3k)
reticulate now explicitly qualifies symbols used from TinyThread with tthread::, to avoid issues with symbol conflicts during compilation. (#773)
reticulate will now prefer an existing Miniconda installation over a conda binary on the PATH, when looking for Conda. (#790)

reticulate 1.16

TinyThread now calls Rf_error() rather than std::terminate() when an internal error occurs.
Conversion of Pandas DataFrames to R no longer emits deprecation warnings with pandas >= 0.25.0. (#762)
reticulate now properly handles the version strings returned by beta versions of pip. (#757)
conda_create() gains the forge and channel arguments, analogous to those already in conda_install(). (#752, @jtilly)

reticulate 1.15

reticulate now ensures SciPy csr_matrix objects are sorted before attempting to convert them to their R equivalent. (#738, @paulofelipe)
Fixed an issue where calling input() from Python with no prompt would fail. (#728)
Lines ending with a semi-colon are no longer auto-printed in the reticulate REPL. (#717, @jsfalk)
reticulate now searches for Conda binaries in /opt/anaconda and /opt/miniconda. (#713)
The conda executable used by reticulate can now be configured using an R option. Use options(reticulate.conda_binary = <...>) to force reticulate to use a particular conda executable.
reticulate::use_condaenv() better handles cases where no matching environment could be found. (#687)
reticulate gains the py_ellipsis() function, used to access the Python Ellipsis builtin. (#700, @skeydan)
reticulate::configure_environment() now only allows environment configuration within interactive R sessions, and ensures that the version of Python that has been initialized by Python is indeed associated with a virtual environment or Conda environment. Use reticulate::configure_environment(force = TRUE) to force environment configuration within non-interactive R sessions.
reticulate now automatically flushes output written to Python's stdout / stderr, as a top-level task added by addTaskCallback(). This behavior is controlled with the options(reticulate.autoflush) option. (#685)
reticulate::install_miniconda() no longer attempts to modify the system PATH or registry when installing Miniconda. (#681)
reticulate::conda_install() gains the channel argument, allowing custom Conda channels to be used when installing Python packages. (#443)
reticulate::configure_environment() can now be used to configure a non-Miniconda Python environment. (#682; @skeydan)
Fixed an issue where matplotlib plots would be included using absolute paths, which fails in non-standalone documents rendered to HTML. (#669)
Fixed an issue where reticulate would attempt to flush a non-existent stdout / stderr stream. (#584)

reticulate 1.14

Fixed an issue where rmarkdown::render() could fail when including matplotlib plots when knit_root_dir is set. (#645)
reticulate now scans for Conda installations within the ~/opt folder, as per the updated installers distributed for macOS. (#661)
Python classes can now be defined directly from R using the PyClass() function. (#635; @dfalbel)
reticulate is now compatible with Python 3.9. (#630, @skeydan)
Pandas DataFrames with a large number of columns should now be converted to R data.frames more quickly. (#620, @skeydan)
Python loggers are now better behaved in the Python chunks of R Markdown documents. (#386)
reticulate will now attempt to bind to python3 rather than python, when no other version of Python has been explicitly requested by e.g. use_python().
reticulate now provides R hooks for Python's input() and raw_input() functions. It should now be possible to read user input from Python scripts loaded by reticulate. (#610)
reticulate now more consistently normalizes the paths reported by py_config(). (#609)
reticulate now provides a mechanism for allowing client packages to declare their Python package dependencies. Packages should declare the Python packages they require as part of the Config/reticulate field in their DESCRIPTION file. Currently, this only activated when using Miniconda; as the assumption is that users will otherwise prefer to manually manage their Python environments. Please see vignette("python_dependencies") for more details.
reticulate will now prompt the user to create and use a Miniconda environment when no other suitable Python environment has already been requested. This should help ease some of the trouble in setting up a Python environment on different platforms. The installer code was contributed by @hafen, from the rminiconda package.
Fixed an issue where virtualenv_create(..., python = "<python>") could fail to use the requested version of Python when venv is not installed. (#399)
Fixed an issue where iterable Python objects could not be iterated with iter_next() due to a missing class. (#603)
Fixed an issue where Conda environments could be mis-detected as virtual environments.
R functions wrapping Python functions now inherit the formal arguments as specified by Python, making autocompletion more reliable. (#573, @flying-sheep)
Fixed an issue where attempts to query Conda for environments could fail on Windows. (#576; #575; @dfalbel)
Properly check for NULL keyword arguments in call_r_function(). (#562, @dfalbel)

reticulate 1.13

Fixed an issue where subsetting with [.python.builtin.object could fail when convert = TRUE is set on the associated Python object. (#554)
Fixed an issue where the wrong definition of [[.python.builtin.object was being exported. (#554)
py_install() now accepts python_version, and can be used if a particular version of Python is required for a Conda environment. (This argument is ignored for virtual environments.) (#549)
Fixed an issue where reticulate could segfault in some cases (e.g. when using the iterate() function). (#551)
It is now possible to compile reticulate with support for debug versions of Python by setting the RETICULATE_PYTHON_DEBUG preprocessor define during compilation. (#548)
reticulate now warns if it did not honor the user's request to load a particular version of Python, as through e.g. reticulate::use_python(). (#545)
py_save_object() and py_load_object() now accept ... arguments. (#542)
py_install() has been revamped, and now better detects available Python tooling (virtualenv vs. venv vs. Conda). (#544)
reticulate now flushes stdout / stderr after calls to py_run_file() and py_run_string().
Python tuples are now converted recursively, in the same way that Python lists are. This means that the sub-elements of the tuple will be converted to R objects when possible. (#525, @skeydan)
Python OrderedDict objects with non-string keys are now properly converted to R. (#516)
Fixed an issue where reticulate could crash after a failed attempt to load NumPy. (#497, @ecoughlan)

reticulate 1.12

Fixed an issue where Python objects within Python lists would not be converted to R objects as expected.
Fixed an issue where single-row data.frames with row names could not be converted. (#468)
Fixed an issue where reticulate could fail to query Anaconda environment names with Anaconda 3.7.
Fixed an issue where vectors of R Dates were not converted correctly. (#454)
Fixed an issue where R Dates could not be passed to Python functions. (#458)

reticulate 1.11.1

Fixed a failing virtual environment test on CRAN.

reticulate 1.11

Fixed an issue where attempts to activate virtual environments created with virtualenv 16.4.1 would fail. (#437)
Fixed an issue where conversion of Pandas Categorical variables to R objects would fail. (#389)
Textual output generated when adding items to a matplotlib plot object are now suppressed.
If the last statement in a Python chunk returns a matplotlib plot object, the plot will now be auto-shown as in other environments.
The reticulate function help handler now returns function arguments for Python builtin functions.
Top-level Python statements can now include leading indent when submitted with repl_python().
The current matplotlib figure is now cleared as each Python chunk in an R Markdown document is run.
The r helper object (used for evaluating R code from Python) now better handles conversion of R functions. (#383)
The use_virtualenv() function now understands how to bind to virtual environments created by the Python venv module.
Reticulate better handles conversions of R lists to Python, and similarly, Python lists to R. We now call r_to_py() on each sub-element of an R list, and similarly, py_to_r() on each sub-element of a Python list.
Reticulate now always converts R Date objects into Python datetime objects. Note that these conversions can be inefficient -- if you would prefer conversion to NumPy datetime64 objects / arrays, you should convert your date to POSIXct first.
Python chunks containing errors will cause execution to halt if 'error=FALSE' during render, conforming with the default knitr behavior for R chunks.
The output of bare statements (e.g. 1 + 1) is now emitted as output when using the reticulate Python engine.
Remapping of Python output streams to be R can now be explicitly enabled by setting the environment variable RETICULATE_REMAP_OUTPUT_STREAMS to 1. (#335)
Allow syntax errors in Python chunks with 'eval = FALSE' (#343)
Avoid dropping blank lines in Python chunks (#328)
Use "agg" matplotlib backend when running under RStudio Desktop (avoids crashes when attempting to generate Python plots)
Add as.character() S3 method for Python bytes (defaults to converting using UTF-8 encoding)
Add py_main_thread_func() for providing R callbacks to Python libraries that may invoke the function on a Python background thread.
Add py_to_r S3 methods for Scipy sparse matrices: CSR to dgRMatrix, COO to dgTMatrix, and for all other sparse matrices, conversion via CSC/dgCMatrix.

reticulate 1.10

Output is now properly displayed when using the reticulate REPL with Windows + Python 2.7.
Address memory protection issues identified by rchk
Make variables defined using %as% operator in with() available after execution of the with block (same behavior as Python).
Check for presence of "module" property before reading in as_r_class()
Only update pip in virtualenv_install() when version is < 8.1
Support converting Python OrderedDict to R
Support for iterating all types of Python iterable
Add conda_python() and virtualenv_python() functions for finding the python binary associated with an environment.

reticulate 1.9

Detect python 3 in environments where there is no python 2 (e.g. Ubuntu 18.04)
Always call r_to_py S3 method when converting objects from Python to R
Handle NULL module name when determining R class for Python objects
Convert RAW vectors to Python bytearray; Convert Python bytearray to RAW
Use importlib for detecting modules (rather than imp) for Python >= 3.4
Close text connection used for reading Python configuration probe

reticulate 1.8

source_python() now flushes stdout and stderr after running the associated Python script, to ensure that print()-ed output is output to the console. (#284)
Fixed an issue where logical R matrices would not be converted correctly to their NumPy counterpart. (#280)
Fixed an issue where Python chunks containing multiple statements on the same line would be evaluated and printed multiple times.
Added py_get_item(), py_set_item(), and py_del_item() as lower-level APIs for directly accessing the items of e.g. a Python dictionary or a Pandas DataFrame.
Fix issue with Pandas column names that clash with built in methods (e.g. 'pop')
Improve default str() output for Python objects (print __dict__ if available)

reticulate 1.7

Improved filtering of non-numeric characters in Python / NumPy versions.
Added py_func() to wrap an R function in a Python function with the same signature as that of the original R function.
Added support for conversion between Matrix::dgCMatrix objects in R and Scipy CSC matrices in Python.
source_python() can now source a Python script from a URL into R environments.
Always run source_python() in the main Python module.
py_install() function for installing Python packages into virtualenvs and conda envs
Automatically create conda environment for conda_install()
Removed delay_load parameter from import_from_path()

reticulate 1.6

repl_python() function implementing a lightweight Python REPL in R.
Support for converting Pandas objects (Index, Series, DataFrame)
Support for converting Python datetime objects.
py_dict() function to enable creation of dictionaries based on lists of keys and values.
Provide default base directory (e.g. '~/.virtualenvs') for environments specified by name in use_virtualenv().
Fail when environment not found with use_condaenv(..., required = TRUE)
Ensure that use_* python version is satisfied when using eng_python()
Forward required argument from use_virtualenv() and use_condaenv()
Fix leak which occurred when assigning R objects into Python containers
Add support for Conda Forge (enabled by default) to conda_install()
Added functions for managing Python virtual environments (virtualenv)

reticulate 1.5

Remove implicit documentation extraction for Python classes
Add Library\bin to PATH on Windows to ensure Anaconda can find MKL
New source_python() function for sourcing Python scripts into R environments.

reticulate 1.4

Support for RETICULATE_DUMP_STACK_TRACE environment variable which can be set to the number of milliseconds in which to output into stderr the call stacks from all running threads.
Provide hook to change target module when delay loading
Scan for conda environments in system-level installations
Support for miniconda environments
Implement eval, echo, and include knitr chunk options for Python engine

reticulate 1.3.1

Bugfix: ensure single-line Python chunks that produce no output still have source code emitted.

reticulate 1.3

Use existing instance of Python when reticulate is loaded within an embedded Python environment (e.g. rpy2, rice, etc.)
Force use of Python specified in PYTHON_SESSION_INITIALIZED (defined by rpy2)
Define R_SESSION_INITIALIZED (used by rpy2)
Force use of Python when required = TRUE in use_python functions
Force use of Python specified by RETICULATE_PYTHON
dict: Don't scan parent frame for Python objects if a single unnamed list is passed.
Wait as long as required for scheduling generator calls on the main thread
Refine stripping of object addresses from output of py_str() method
Added py_id() function to get globally unique ids for Python objects
Added py_len() function and S3 length() method for Python lists (already had length() methods for dicts, tuples, and NumPy arrays).
Exported py object (reference to Python main module)
Added eng_python() (knitr engine for Python chunks)
Improved compatibility with strings containing high unicode characters when running under Python 2
Remove dim methods for NumPy arrays (semantics of NumPy reshaping are different from R reshaping)
Added array_reshape function for reshaping R arrays using NumPy (row-major) semantics.
Provide mechanism for custom R wrapper objects for Python objects
Added interface to pickle (py_save_object() and py_load_object())
Catch and print errors which occur in generator functions
Write using Rprintf when providing custom Python output streams (enables correct handling of terminal control characters)
Implement isatty when providing custom Python output streams

reticulate 1.2

Add np_array function for creating NumPy arrays and converting the data type, dimensions, and in-memory ordering of existing NumPy arrays.
Add dim and length functions for NumPy arrays
Add py_set_seed function for setting Python and NumPy random seeds.
Search in additional locations for Anaconda on Linux/Mac
Improved support for UTF-8 conversions (always use UTF-8 when converting from Python to R)
Ignore private ("_" prefixed) attributes of dictionaries for .DollarNames
Provide "`function`" rather than "function" in completions.
Fail gracefully if call to conda in conda_list results in an error
Add pip_ignore_installed option to conda_install function.

reticulate 1.1

Allow dict() function to accept keys with mixed alpha/numeric characters
Use conda_list() to discover conda environments on Windows (slower but much more reliable than scanning the filesystem)
Add interface for registering F1 help handlers for Python modules
Provide virtual/conda env hint mechanism for delay loaded imports

reticulate 1.0

Search WORKON_HOME (used by virtualenv_wrapper) for Python environments
Support priority field for delay loaded modules.
Use json output from conda_list (handle spaces in path of conda env)
Look for callable before iterable when converting Python objects to R
Correct propagation of errors in R functions called from Python
Support for generators (creating Python iterators from R functions)
Changed default completed value for iter_next() to NULL (was NA)
Support for converting 16-bit floats (NPY_HALF) to R
Don't throw error when probing Python <= 2.6
Copy Python dictionary before converting to R named list (fixes issue with dictionaries that are mutated during iteration, e.g. sys.modules)
Ensure that existing warning filters aren't reset by py_suppress_warnings

reticulate 0.9

Detect older versions of Anaconda during registry scanning.
Don't probe python versions on windows when no executable is found
Poll for interrupts every 500ms rather than 100ms
Provide sys.stdout and sys.stderr when they are None (e.g. in R GUI)
Add Scripts directory to PATH on Windows
Add iter_next function for element-by-element access to iterators
Eliminate special print method for iterators/generators
Added py_help() function for printing documentation on Python objects
Added conda_version() function.
Search dict() parent frames for symbols; only use symbols which inherit from python.builtin.object as keys.

reticulate 0.8

Add import_from_path() function for importing Python modules from the filesystem.
Add py_discover_config() function to determine which versions of Python will be discovered and which one will be used by reticulate.
Add py_function_docs() amd py_function_wrapper() utility functions for scaffolding R wrappers for Python functions.
Add py_last_error() function for retrieving last Python error.
Convert 0-dimension NumPy arrays (scalars) to single element R vectors
Convert "callable" Python objects to R functions
Automatically add Python bin directory to system PATH for consistent version usage in reticulate and calls to system
Added length() method for tuple objects
Enable specification of __name__ for R functions converted to Python functions.
Give priority to the first registered delay load module (previously the last registered module was given priority)
Add additional safety checks to detect use of NULL xptr objects (i.e. objects from a previous session). This should mean that S3 methods no longer need to check whether they are handling an xptr.
Added py_eval() function for evaluating simple Python statements.
Add local option to py_run_string() and py_run_file(). Modify behavior to return local execution dictionary (rather than a reference to the main module).
Use PyImport_Import rather than PyImport_ImportModule for import()
Added ability to customize mapping of Python classes to R classes via the as argument to import() and the register_class_filter() function
Added separate on_load and on_error functions for delay_load
Scan customary root directories for virtualenv installations
Allow calling __getitem__ via [[ operator (zero-based to match Python style indexing)
Added conda_* family of functions for using conda utilities from within R.
Implement comparison operators (e.g. ==, >=, etc.) for Python objects
Implement names() generic for Python objects
Improve performance for marshalling of large Python dictionaries and iterators that return large numbers of items.
Implement str methods for Python List, Dict, and Tuple (to prevent printing of very large collections via default str method)
Use grepl() rather than endsWith() for compatibility with R <= 3.2
Use inspect.getmro rather than __bases__ for enumerating the base classes of Python objects.
Fix PROTECT/UNPROTECT issue detected by CRAN
Correct conversion of strings with Unicode characters on Windows
Fix incompatibility with system-wide Python installations on Windows
Fix issue with Python dictionary keys that shared names with primitive R functions (don't check environment inheritance chain when looking for dictionary key objects by name).
Propagate convert parameter for modules with delay_load

reticulate 0.7

Initial CRAN release

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reticulate Interface to 'Python'

NEWS.md In reticulate: Interface to 'Python'