Replaces is operator with == for literal or new object comparisons

[pixeebot]

The is and is not operator will only return True when the expression have the same id. In other words, a is b is equivalent to id(a) == id(b). New objects and literals have their own identities and thus shouldn't be compared with using the is or is not operators.

Our changes look something like this:

def foo(l):
-    return l is [1,2,3]
+    return l == [1,2,3]

More reading

• https://docs.python.org/3/library/stdtypes.html#comparisons

I have additional improvements ready for this repo! If you want to see them, leave the comment:

@pixeebot next

... and I will open a new PR right away!

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