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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.
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sweeneyde 2020-04-22 17:05:48 -04:00 • committed by GitHub
parent 39652cd8bd
commit a81849b031
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13 changed files with 597 additions and 6 deletions
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8
Lib/collections/__init__.py
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@ -1239,6 +1239,14 @@ class UserString(_collections_abc.Sequence):
if isinstance(sub, UserString):
sub = sub.data
return self.data.count(sub, start, end)
def removeprefix(self, prefix, /):
if isinstance(prefix, UserString):
prefix = prefix.data
return self.__class__(self.data.removeprefix(prefix))
def removesuffix(self, suffix, /):
if isinstance(suffix, UserString):
suffix = suffix.data
return self.__class__(self.data.removesuffix(suffix))
def encode(self, encoding='utf-8', errors='strict'):
encoding = 'utf-8' if encoding is None else encoding
errors = 'strict' if errors is None else errors