Syntax for an If statement using a boolean

Question

I just recently joined the python3 HypeTrain. However I just wondered how you can use an if statement onto a boolean. Example:

RandomBool = True
# and now how can I check this in an if statement? Like the following:
if RandomBool == True:
    # DoYourThing

And also, can I just switch the value of a boolean like this?

RandomBool1 == True # Boolean states True
if # AnyThing:
    RandomBool1 = False # Boolean states False from now on?

"if Check6228 == False: UnboundLocalError: local variable 'Check6228' referenced before assignmen" — Lucidity, Jul 17 '16 at 16:26
Value assignment uses the `=` operator, `==` checks for _equality_. — miradulo, Jul 17 '16 at 16:27
Nah using == was correctly but i found a mistake inb the declaring process! Give me a sec :D — Lucidity, Jul 17 '16 at 16:28
@Lucidity Most likely, as you did in your second example with `RandomBool1 == True`, presuming you hadn't assigned a value to `RandomBool1` before that. — miradulo, Jul 17 '16 at 16:28
Possible duplicate of [Strange PEP8 recommandation on comparing Boolean values to True or False](https://stackoverflow.com/questions/4050335/strange-pep8-recommandation-on-comparing-boolean-values-to-true-or-false) — tamerlaha, Oct 26 '17 at 11:38

score 111 · Accepted Answer · answered Jul 17 '16 at 16:28

111

You can change the value of a bool all you want. As for an if:

if randombool == True:

works, but you can also use:

if randombool:

If you want to test whether something is false you can use:

if randombool == False

but you can also use:

if not randombool:

answered Jul 17 '16 at 16:28

Mathime

This answer could be completed with the response from @user15547210 I think "if randombool is True:" might be longer than "if randombool:", but it's also more intuitive than both options here. Anyway, the three form the complete set for anyone to choose from. – ao_martinv May 25 '23 at 09:03

score 13 · Answer 2 · answered Apr 03 '21 at 19:55

13

I think You could also just use

if randombool is True:

elif randombool is False:

I don't think you need to use equal signs unless it's an int or float.

Correct me if I'm wrong

answered Apr 03 '21 at 19:55

user15547210

score 1 · Answer 3 · answered Mar 29 '23 at 16:33

1

According to PEP 8, it looks like we should just be using

if RandomBool:

or

if not RandomBool:

I believe is compares memory addresses, and PEP 8 says we shouldn't compare bools with ==:

answered Mar 29 '23 at 16:33

jaredlee.dev

3 Answers3