How to check if a Python variable exists?
Variables in Python can be defined locally or globally. There are two types of variables first one is a local variable that is defined inside the function and the second one are global variable that is defined outside the function.
Method 1: Checking the existence of a local variable
Method 2: Checking the existence of a globel variable
To check the existence of variables globally we are going to use the globals() function to get the dictionary of the current global symbol table.
Method 3: Testing if a Variable Is Defined or not using try and except
A NameError exception is raised when attempting to access a variable that hasn’t yet been defined, you can manage this with a try/except statement
Error: No value detected