can't understand what's happening in output pls help. is 0 being taken as false and not 0 as true . So as 3 is true but not not

Question

if 0:
print("yes")

if not 0:
print("lol")

if 3:
print("yes")

if not 3:
print("lol")

output-
lol
yes

Answer 1

Its better understand that "if" statement want an boolean value else python have to convert it to boolean. Then, the problem, is understand as python convert types to boolean. Well:

- All numeric values will be converted to true except 0

- All class objects will be converted to true except when you define custom __bool__ operator

- None is always converted to false

- Strings are converted to true if are not empty strings, else false

Answer 2

0 has always a boolean value of false
every other number returns true - nums included

Answer 3

Mostly program languages do it like Mbrustler said. A think you are confuse because in SHELL you have 0 as exit_success and non-zero means exit_failure, in other words, it's backwards.