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bpo-39939: Add str.removeprefix and str.removesuffix (GH-18939)

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Added str.removeprefix and str.removesuffix methods and corresponding
bytes, bytearray, and collections.UserString methods to remove affixes
from a string if present. See PEP 616 for a full description.
This commit is contained in:
sweeneyde 2020-04-22 17:05:48 -04:00 • committed by GitHub
parent 39652cd8bd
commit a81849b031
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GPG key ID: 4AEE18F83AFDEB23
13 changed files with 597 additions and 6 deletions
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36
Lib/test/string_tests.py
View file

@ -682,6 +682,42 @@ class BaseTest:
self.checkraises(OverflowError, A2_16, "replace", "A", A2_16)
self.checkraises(OverflowError, A2_16, "replace", "AA", A2_16+A2_16)
def test_removeprefix(self):
self.checkequal('am', 'spam', 'removeprefix', 'sp')
self.checkequal('spamspam', 'spamspamspam', 'removeprefix', 'spam')
self.checkequal('spam', 'spam', 'removeprefix', 'python')
self.checkequal('spam', 'spam', 'removeprefix', 'spider')
self.checkequal('spam', 'spam', 'removeprefix', 'spam and eggs')
self.checkequal('', '', 'removeprefix', '')
self.checkequal('', '', 'removeprefix', 'abcde')
self.checkequal('abcde', 'abcde', 'removeprefix', '')
self.checkequal('', 'abcde', 'removeprefix', 'abcde')
self.checkraises(TypeError, 'hello', 'removeprefix')
self.checkraises(TypeError, 'hello', 'removeprefix', 42)
self.checkraises(TypeError, 'hello', 'removeprefix', 42, 'h')
self.checkraises(TypeError, 'hello', 'removeprefix', 'h', 42)
self.checkraises(TypeError, 'hello', 'removeprefix', ("he", "l"))
def test_removesuffix(self):
self.checkequal('sp', 'spam', 'removesuffix', 'am')
self.checkequal('spamspam', 'spamspamspam', 'removesuffix', 'spam')
self.checkequal('spam', 'spam', 'removesuffix', 'python')
self.checkequal('spam', 'spam', 'removesuffix', 'blam')
self.checkequal('spam', 'spam', 'removesuffix', 'eggs and spam')
self.checkequal('', '', 'removesuffix', '')
self.checkequal('', '', 'removesuffix', 'abcde')
self.checkequal('abcde', 'abcde', 'removesuffix', '')
self.checkequal('', 'abcde', 'removesuffix', 'abcde')
self.checkraises(TypeError, 'hello', 'removesuffix')
self.checkraises(TypeError, 'hello', 'removesuffix', 42)
self.checkraises(TypeError, 'hello', 'removesuffix', 42, 'h')
self.checkraises(TypeError, 'hello', 'removesuffix', 'h', 42)
self.checkraises(TypeError, 'hello', 'removesuffix', ("lo", "l"))
def test_capitalize(self):
self.checkequal(' hello ', ' hello ', 'capitalize')
self.checkequal('Hello ', 'Hello ','capitalize')

2
Lib/test/test_doctest.py
View file

@ -665,7 +665,7 @@ plain ol' Python and is guaranteed to be available.
>>> import builtins
>>> tests = doctest.DocTestFinder().find(builtins)
>>> 810 < len(tests) < 830 # approximate number of objects with docstrings
>>> 816 < len(tests) < 836 # approximate number of objects with docstrings
True
>>> real_tests = [t for t in tests if len(t.examples) > 0]
>>> len(real_tests) # objects that actually have doctests