overload `in(x, o::Py)` to call `o.__contains__(x)`

[stevengj]

I just noticed that PyCall was missing an overload of in for PyObject, and I figured you might want the same for Py.

[stevengj]

There are a few other such methods that might be worth exposing as well: https://docs.python.org/3/library/operator.html

[cjdoris]

Already got it thanks! 🙂

https://github.com/cjdoris/PythonCall.jl/blob/ffdac16d3092a59ee83c5d0f69245d34a4c3e4dc/src/Py.jl#L337

I think all those operators which have an equivalent in Base are already there. Let me know if you spot any I've missed.