Having issues detecting blank inputs

Question

https://code.sololearn.com/cnsj6atyUb2A/#py

How do I prevent a user from entering a blank entry for the requested input? I figured out how to prevent spaces, but a blank input is still accepted if a user just presses enter. I outlined the part of this code that blocks spaces, but it doesn't block the blank entry

Answer 1

When you check a string for True or False, it is True if there's *anything* in it (even a space), and False, if there's nothing in it.

input, if the user just hits enter, gives an empty string.

And you can just test for that.

inp = input()
if not inp:
print('What, no input?')

Answer 2

Generally (not on Sololearn) I'd take input in a while loop, then break if all my conditions are met.

while True:
inp = input()
if ...:
break

To check if a str is empty, you can just use 'not inp' - str is False when it is of zero length.

Answer 3

Please explain that line.
"not inp" -str is False
Why the negative sign in front of str and how does this accomplish the zero length? Ive tried len to no success and I am confused as to why this would work. Thank you very much 👍 Not trying to be difficult just really dont understand that line

Answer 4

Ah. I see what you mean. Thank you kind one! I guess I was making this way more complicated than it had to be haha.
EDIT
I'm going to have to research this a bit I think