not None test in Python

In Python, you can check if a variable is not None using the is not operator. Here is an example code snippet:

not None test in Python using the is not None keyword

x = 5
if x is not None:
    print("x is not None")
else:
    print("x is None")

This will print "x is not None" because the variable x is not None.

Alternatively, you can use if x: to check if a variable is truthy. Note that this is not equivalent to if x is not None:. The if x: condition evaluates to True unless the value is considered "falsy" (such as None, False, 0, "", or empty collections).

not None test in Python

x = 5
if x:
    print("x is truthy")
else:
    print("x is falsy")

This will print "x is truthy" because 5 is a truthy value. Unlike is not None, the if x: check will also evaluate to False for 0, False, empty strings, and empty collections.