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Tue Apr 3 19:34:58 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-April/152607.html

This behavior was recently brought to my attention [1]:

--> 1 in 'hello'
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
TypeError: 'in <string>' requires string as left operand, not int

However, in any other collection (set, dict, list, tuple, etc), the answer would be False.

Does anyone remember the reason why an exception is raised in the string instance instead of returning False?

--
~Ethan~

[1] https://bugs.python.org/msg314900

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[Python-Dev] <int> in <str>