How to make a custom C PyTypeObject work with python's "in" keyword?

Question

As a simple example, I want to allow this kind of usage in a python script assuming mycustom_CType is an instance of my defined PyTypeObject in C:

print('foo' in mycustom_CType)

What slots and functions in PyTypeObject's struct does python need for this to work? I'm guessing possibly tp_iter and tp_iternext but I can't be sure since the python docs doesn't say that for those 2 struct fields.

Ignacio Vazquez-Abrams · Accepted Answer · 2013-07-01 19:28:28Z

2

The tp_as_sequence.sq_contains member of the type is invoked for containment checking.

answered Jul 1, 2013 at 19:28

Ignacio Vazquez-Abrams

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