Python not Keyword

A logical operator that returns True if the statement is False, returns False if the statement is True.

Example

success = False
if not success:
    print('Sadly, we did not succeed')

# but what if we turn things around?
success = not success # success will now be 'not False' which is True

if (success):
    print('Yes, we succeeded!')

Output

Sadly, we did not succeed
Yes, we succeeded!

Notes

You can use the not operator in other interesting ways, for example:

print(not 1 < 2)
print(not 1 in [2, 3, 4])

Output

False
True