In nicolewhite/pystr: Python String Methods in R

pystr

String operations the Python way: a package for those of us who miss Python's string methods while we're working in R.

Install

From CRAN (Stable Release)

install.packages("pystr")

From GitHub (Latest Development Release)

devtools::install_github("nicolewhite/pystr")

Load the Package

library(pystr)

String Formatting

Most importantly, pystr brings a port of Python's str.format to R with pystr_format.

Indexed Parameters

You can pass in parameters individually:

pystr_format("Hello {1}, my name is {2}.", "World", "Nicole")

As a vector:

params = c("World", "Nicole")
pystr_format("Hello {1}, my name is {2}.", params)

Or as a list:

params = list("World", "Nicole")
pystr_format("Hello {1}, my name is {2}.", params)

Named Parameters

You can pass in named parameters individually:

pystr_format("Hello {thing}, my name is {name}.", thing="World", name="Nicole")

As a named vector:

params = c(thing="World", name="Nicole")
pystr_format("Hello {thing}, my name is {name}.", params)

Or as a named list:

params = list(thing="World", name="Nicole")
pystr_format("Hello {thing}, my name is {name}.", params)

Repeated Parameters

Parameters can be used more than once throughout a string:

pystr_format("The name is {last}. {first} {last}.", last="Bond", first="James")

Replacement Types

Pass in characters and numbers:

pystr_format("Hello {name}, you have {n} new notifications!", name="Nicole", n=3)

Other Ported Methods

pystr_capitalize

Port of str.capitalize.

pystr_capitalize("ONCE UPON A TIME, ")

pystr_center

Port of str.center.

pystr_center("center me", 15, "*")

pystr_count

Port of str.count.

pystr_count("abcxyzabc123", "abc")

pystr_endswith

Port of str.endswith.

pystr_endswith("selfie.jpg", ".jpg")
pystr_endswith("selfie.jpg", c(".jpg", ".png"))

pystr_find

Port of str.find.

pystr_find("12345", "34")

pystr_index

Port of str.index.

pystr_index("12345", "34")
pystr_index("12345", "xy")

pystr_isalnum

Port of str.isalnum.

pystr_isalnum("abc123")
pystr_isalnum("abc123!")

pystr_isalpha

Port of str.isalpha.

pystr_isalpha("abc")
pystr_isalpha("abc!")

pystr_islower

Port of str.islower.

pystr_islower("all lowercase!")
pystr_islower("All lowercase?")

pystr_isnumeric

Port of str.isnumeric.

pystr_isnumeric("123")
pystr_isnumeric("123!")

pystr_isspace

Port of str.isspace.

pystr_isspace("   ")

pystr_istitle

Port of str.istitle.

pystr_istitle("I Am A Title")
pystr_istitle("I Am not A Title")

pystr_isupper

Port of str.isupper.

pystr_isupper("HELLO!")

pystr_join

Port of str.join.

pystr_join(c("A", "BB", "CCC"))
pystr_join(c(1, 2, 3), "+")

pystr_ljust

Port of str.ljust.

pystr_ljust("left", 10)
pystr_ljust("left", 10, "*")

pystr_lower

Port of str.lower.

pystr_lower("LOWERCASE ME!")

pystr_lstrip

Port of str.lstrip.

pystr_lstrip("www.example.com", "w.")

pystr_maketrans

Port of str.maketrans.

map = pystr_maketrans("abc", "123")
pystr_translate("a blue cat", map)

pystr_partition

Port of str.partition.

pystr_partition("onetwothreeonetwothree", "two")

pystr_replace

Port of str.replace.

pystr_replace("mississippi", "ss", "X")
pystr_replace("mississippi", "ss", "X", 1)

pystr_rfind

Port of str.rfind.

pystr_rfind("abcxyzabc", "abc")

pystr_rindex

Port of str.rindex.

pystr_rindex("abcdab", "ab")
pystr_rindex("abcdab", "xy")

pystr_rjust

Port of str.rjust.

pystr_rjust("right", 10)
pystr_rjust("right", 10, "*")

pystr_rpartition

Port of str.rpartition.

pystr_rpartition("onetwothreeonetwothree", "two")

pystr_rsplit

Port of str.rsplit.

pystr_rsplit("a--b--c", "--", 1)

pystr_rstrip

Port of str.rstrip.

pystr_rstrip("mississippi", "ipz")

pystr_split

Port of str.split.

pystr_split("1+2+3+4", "+")
pystr_split("1+2+3+4", "+", 1)

pystr_splitlines

Port of str.splitlines.

pystr_splitlines("First\nSecond\nThird")

pystr_startswith

Port of str.startswith.

pystr_startswith("http://www.example.com", "http://")
pystr_startswith("http://www.example.com", c("http://", "https://"))

pystr_strip

Port of str.strip.

pystr_strip("    very spacious    ")
pystr_strip("www.example.com", "wcom.")

pystr_swapcase

Port of str.swapcase.

pystr_swapcase("Swap Me!")

pystr_title

Port of str.title.

pystr_title("make me pretty")

pystr_translate

Port of str.translate.

map = pystr_maketrans("abc", "123")
pystr_translate("a blue cat", map)

pystr_upper

Port of str.upper.

pystr_upper("uppercase me!")

pystr_zfill

Port of str.zfill.

pystr_zfill("42", 5)
pystr_zfill("-42", 5)

Methods Not Ported (Yet)

• str.casefold
• str.encode
• str.expandtabs
• str.format_map
• str.isdecimal
• str.isdigit
• str.isidentifier
• str.isprintable

nicolewhite/pystr documentation built on May 23, 2019, 5:09 p.m.