check if variable exists python code example

Example 1: 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.

Example 2: js check if function exists

if (typeof yourFunctionName == 'function') { 
  yourFunctionName(); 
}

Example 3: how to check if var exists python

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

Example 4: python check environment variable exists

from os import environ
if environ.get('Foo') is not None:

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