What is this “and” statement actually doing in the return?

Question

I am trying to get a better understanding of the following python code and why the author has used the \"AND\" statement in the return.

def valid_password(se         


        

Answer 1

You just need to know that:

1. Empty strings in Python evaluates to False (also None, empty lists, and other "zero" types).
2. Boolean expressions are subject to an optimization called short-circuit evaluation

Therefore,

a = '1'
print('' and a)

... prints the empty string because as it is False, the expression can never be True and the second part (the a) is never even evaluated.

And

a = '1'
print('' or a)

prints '1', because the empty string is False, the second part has to be evaluated to give the result of the expression.