This is a proposal to change the behaviour of the startswith() and
endswith() methods for str, bytes and bytearray objects, making them
return the matched value instead of the True boolean.
Here a str example with the endswith() method:
domain = "python.org"
if domain.endswith(".fr"):
print(".fr")
elif domain.endswith(".com"):
print(".com")
elif domain.endswith("org"):
print(".org")
With the ".org" non-empty str returned by the endswith() method
instead of the True boolean, the above code will work in the same
manner; moreover as startswith() and endswith() methods support a
tuple as argument, and as the PEP 572 walrus operator is supported
since Python 3.8, we can now write this code in a more compact and
pythonic way:
if suffix := domain.endswith((".fr", ".com", ".org"):
print(suffix)
As the PEP 616 new methods removeprefix() and removesuffix() don't
support a tuple as argument, it will provide a nice and pythonic way
to do it:
if suffix := domain.endswith((".fr", ".com", ".org"):
print(domain[:-len(suffix)])
Hope I don't miss something obvious and that this proposal could
interest some people.
Best regards
Florent
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