If false Python statement | Example code

What does if False Python mean?

The if False is a way of preventing the code which follows from executing but is bad practice.

Example If false Python

So if False python means that the code under this condition will not run. As this condition is always false, the code of this branch is not executed.

if False:
    print("Never execute")

Output: Nothing

If false Python

Use not Keyword

It will execute the if block code.

var = False
if not var:
    print('stuff')

Output: stuff

What is the correct way to check for False?

Answer: if the value could be anything you could check that it’s a boolean and not: this doesn’t rely on False being a singleton. If it always is a singleton you can also do:

if somevalue is False

But PEP8 of Python states you shouldn’t care if it about the class and just use:

if not somevalue

this will evaluate if somevalue is “falsy”. See Python documentation on Truth value testing.

PEP8 states:

Don’t compare boolean values to True or False using == .

Yes:   if greeting:
No:    if greeting == True:
Worse: if greeting is True:

Source: stackoverflow.com

Do comment if you have any doubts and suggestions on this Python if the topic.

Note: IDE: PyCharm 2021.1.3 (Community Edition)

Windows 10

Python 3.7

All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.


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