Explore Courses Blog Tutorials Interview Questions
0 votes
in Python by (850 points)
It appears that "if x" is almost like short-hand for the longer "if x is not None" syntax. Are they functionally identical or are there cases where for a given value of x the two would evaluate differently?

I would assume the behavior should also be identical across Python implementations - but if there are subtle differences it would be great to know.

1 Answer

0 votes
by (119k points)

Both "if x" and "if x is none" are not the same. If you run the statement "if x:"  checks whether x is assigned or not. If you execute the statement "if x is not none", is operator checks whether x is none or not. 

If you are still confused, Assign the values x = none, x = [], and x = 21 and run the following code. You can observe for x = none, no print statement will be executed, for x = [], only second print statement will be executed, and for x = 21, both the print statements will be executed.

if x: 

    print ('if x' )

if x is not None:

    print( 'if x is not None')

If you want to become a pro in Python then sign up for this Python Training course by Intellipaat that offers instructor-led training, hands-on assignments, and certification. 

Related questions

0 votes
1 answer
0 votes
1 answer
0 votes
4 answers
0 votes
2 answers
asked Oct 3, 2019 in Python by Tech4ever (20.3k points)
Welcome to Intellipaat Community. Get your technical queries answered by top developers!

30.5k questions

32.6k answers


108k users

Browse Categories