Python-ideas

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python-ideas@python.org

January 2020

59 participants
42 discussions

Allow metaclass to override __subclasscheck__ for metaclass relations
by Soni L. Jan. 1, 2020

Jan. 1, 2020

I would like this code to work, but currently python ignores __subclasscheck__ in many places where it checks for subclasses: class MM(type): def __subclasscheck__(self, subclass): return issubclass(subclass, type) class M(type, metaclass=MM): pass class N(type): pass class C(metaclass=M): pass class D(metaclass=N): pass class E(C, D, … [View More]

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more readable "if" for multiple "in" condition
by iman.h.a.khamse＠gmail.com Jan. 1, 2020

Jan. 1, 2020

Hi I think the following syntax's: if foo in foobar or bar in foobar or baz in foobar: pass if foo in foobar and bar in foobar and baz in foobar: pass can be more readable and shorter if written as: if foo or bar or baz in foobar: pass if foo and bar and baz in foobar: pass maybe for "is" instead of: if foobar is foo or foobar is bar or foobar is baz: pass if foobar is foo or bar or baz: pass now the recommended syntax translate to this: (I think so) if foo (IS … [View More]

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