Ockonal Ockonal - 1 year ago 161
Python Question

How do I check if a variable exists in Python?

I want to check if a variable exists. Now I'm doing something like this:

except NameError:
# Do something.

Are there other ways without exceptions?

Answer Source

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.
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