Misc Python powertips
Check the existence of a local variable
Source: https://stackoverflow.com/questions/843277/how-do-i-check-if-a-variable-exists
To check the existence of a local variable:
if 'myVar' in locals():
# myVar exists.
To check the existence of a global variable:
if 'myVar' in globals():
# myVar exists.
To check if an object has an attribute:
if hasattr(obj, 'attr_name'):
# obj.attr_name exists.