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Home/ Questions/Q 599025
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T16:27:11+00:00 2026-05-13T16:27:11+00:00

If I am creating my own class in Python, what function should I define

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If I am creating my own class in Python, what function should I define so as to allow the use of the in operator, e.g.

class MyClass(object):
    ...

m = MyClass()

if 54 in m:
    ...

See also What does __contains__ do, what can call __contains__ function for the corresponding question about what __contains__ does.

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  1. Editorial Team
    Editorial Team
    2026-05-13T16:27:11+00:00Added an answer on May 13, 2026 at 4:27 pm

    MyClass.__contains__(self, item)

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