Contains

[Masynchin]

How do I this?

filter(_ in "123", names)

I tried to implement it since _ has not __contains__, but the only result was not-working "123" in _. Hopes the author can implement this better than me.

[coady]

Unfortunately there's no way to support __contains__. Python coerces the result type of some __dunder__ methods, so it's impossible to return the instance.

In []: class C:
    ...:     def __contains__(self, value):
    ...:         return 'contains'
    ...: 

In []: None in C()
Out[]: True