'is None' VS '== None' in Python

They actually have a discussion about it

• https://stackoverflow.com/questions/14247373/python-none-comparison-should-i-use-is-or
• https://softwareengineering.stackexchange.com/questions/321861/var-is-none-vs-var-none/322394

Why use X is None

For this one, there’s only has one condition where X is None, which is X = None.

Why use X == None

For this one, there’s has multiple conditions where X == None, for example:

X = [1,2,3]
X == X[:]  # This is True since two of them are "equivalent"
X is X[:]  # This is False since they're actually different objects

For me, I think X[:] and X are exactly the same things. If you doubt, check the javascript syntax.

In my opinion 

It’s silly to have a keyword called is in there because other programming languages don’t have it.

It increases the difficulty to master a lot of programming languages at the same time.

And it is unnecessary according to the difference showed in here.

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