While I appreciate that use of "is" in thing is None, I claim this relies on
knowledge of how Python works internally, to know that every None actually is
the same ID (the same object) - it is singular. That probably works for 0 and
1 also but you probably wouldn't consider testing thing is 1, at least I hope
you wouldn't. thing is None looks just as odd to me. Why not thing == None ?
That works.
--- Joseph S.
-----Original Message-----
From: Tobiah <t...@tobiah.org>
Sent: Tuesday, July 24, 2018 3:33 PM
To: python-list@python.org
Subject: Checking whether type is None
Consider:
>>> type({}) is dict
True
>>> type(3) is int
True
>>> type(None) is None
False
Obvious I guess, since the type object is not None.
So what would I compare type(None) to?
>>> type(None)
<type 'NoneType'>
>>> type(None) is NoneType
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'NoneType' is not defined
I know I ask whether:
>>> thing is None
but I wanted a generic test.
I'm trying to get away from things like:
>>> type(thing) is type(None)
because of something I read somewhere preferring my original test method.
Thanks
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