Question

I am trying to check for where a global file has been defined or not.

import os, sys, logging...

global my_logger

def init():
  if my_logger is None:
     print 'Logger needs to be initialized'

However, when I run this, I get the error:

NameError: global name 'my_logger' is not defined

Isn’t there a way to check if a variable has been declared or no? Do I have to initialize global variables before I can run a check?

Answer 1

You’re not using the global keyword correctly, look up some documentation concerning that.

As a general rule, however, you can test whether a global variable is defined like so:

defined = 'my_logger' in globals()
if defined:
    print('my_logger has not been defined')