Python provides
-- the not operator, meaning logical negation
-- the in operator, meaning membership
On the other hand, Python provides the not in operator meaning
non-membership. However, it seems we can reformulate any "not in"
expression using only "not" and "in" operation. For instance
>>> 'th' not in "python"
False
>>> not ('th' in "python")
False
>>>
So what is the usefulness of the "not in" operator ? Recall what Zen of
Python tells
There should be one-- and preferably only one --obvious way to do it.
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