How to check if a variable exists in Python ?

Python doesn’t have a specific function to test whether a variable is defined, since all variables are expected to have been defined before use, even if initially assigned the None object.

The following are the ways to check if variable exists in Python.

Local variable

if 'myVar' in locals():
    # myVar exists.

Global variable

if 'myVar' in globals():
    # myVar exists.