how to check if a variable exists in python

#if the variable is local: 
if 'myVar' in locals():
  # myVar exists

#if the variable is global:
if 'myVar' in globals():
  # myVar exists.

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