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

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

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.