Comparing None to several variables in Python3

Question

Is there anyone that can tell my why I get this type of return value?

>>> a = 7
>>> b = None
>>> bool(a and b)
False
>>> bool((a is None) and (b is None))
False
>>> bool((a and b) is None) # (a and b) eq False
True
>>> bool(False is None)
False

I just can't understand why this is happening.

Answer 1

To explain

>>> 7 and None
None
>>> bool(None)
False

So to answer:

• a and b gives None and not False as you put in comment.
• bool(a and b) gives False

So then when you replace a and b by its real value:

• you get bool(None is None) which is True.

I believe you had bool(bool(a and b) is None) in mind, which would give False