Check if var exists

[tomtetlaw]

How do I check if a variable exists?

[AceofSpades19]

If I understand you correctly, you probably want something like

if x is None:
    print "x has no value"

[tomtetlaw]

for your code, you would have to hade done x = None what i want is to check if a var has been defined

[scru]

First of all python has no variables. Here's how to check if a name is defined in local namespace:

"name" in locals()

and global namespace:

"name" in globals()

[tomtetlaw]

Oh ok cool. I understand that everything in python is an object.

[sneekula]

Variables in Python are officially names/identifiers (keys in a dictionary) of object references. I still like to refer to them with the old fashioned name variables, this way other folks know what we are talking about.