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String Functions in Python
The standard library’s string module provides many useful string-related functions. Here are some examples to give you a sense of the module.
import string
# We define a function to print with a shorter name as we'll use it a lot below.
def p(label, value):
print(f"{label} {value}")
# Here's a sample of the functions available in the `string` module.
# Since these are functions from the module, not methods on the string object itself,
# we need to pass the string in question as an argument to the function.
# You can find more functions in the Python documentation for the `string` module.
p("Contains: ", "es" in "test")
p("Count: ", "test".count("t"))
p("StartsWith:", "test".startswith("te"))
p("EndsWith: ", "test".endswith("st"))
p("Index: ", "test".index("e"))
p("Join: ", "-".join(["a", "b"]))
p("Repeat: ", "a" * 5)
p("Replace: ", "foo".replace("o", "0"))
p("Replace: ", "foo".replace("o", "0", 1))
p("Split: ", "a-b-c-d-e".split("-"))
p("ToLower: ", "TEST".lower())
p("ToUpper: ", "test".upper())When you run this program, you’ll get:
$ python string_functions.py
Contains: True
Count: 2
StartsWith: True
EndsWith: True
Index: 1
Join: a-b
Repeat: aaaaa
Replace: f00
Replace: f0o
Split: ['a', 'b', 'c', 'd', 'e']
ToLower: test
ToUpper: TESTIn Python, many of these operations are methods on string objects rather than standalone functions. The in operator is used for checking if a substring is contained in a string. The string module provides additional string constants and functions, but for basic string operations, Python’s built-in string methods are typically used.