how to set a variable to undefined in python code example

Example 1: python undefine variable

# Basic syntax:
del variable

# Example usage:
variable = 42
print(variable)
--> 42
del variable
print(variable)
--> NameError: name 'variable' is not defined
# Note, this error is what we expect now that the variable has been
# 	deleted

Example 2: how to check if var exists python

# for local
if 'myVar' in locals():
  # myVar exists.
# for globals
if 'myVar' in globals():
  # myVar exists.