How this code execution works ?

Question

l = [1,2,False,1,1,{},'',0,44]
f = filter(None, l)
for i in f:
print(i)

In the above code, I have 2 queries.

1. The filter function accepts a function and a sequence as arguments. But here, None is used in place of a function. So how is it possible to call None as a function ?

2. In case of filter function, we return either True or False, so the filter function should print True or false right , how the values are getting printed finally. ( Quite confused how the filter function works)

Answer 1

I re-wrote the code a little so you can see what is going on:
https://code.sololearn.com/cAcLxu1a450G/?ref=app

In summary, filter(None, l) filters out all elements that have a truth value of False.

Answer 2

Quoting from the docs:
If function is None, the identity function is assumed, that is, all elements of iterable that are false are removed.

https://docs.python.org/3/library/functions.html#filter

Answer 3

Lisa I can able to get what the filter does in this case , but my question is how it's filtering out ? Because none is not callable right ?