question on global variables

[mongo57a at comcast.net]

Somewhat new to Python here.....

I want to change/use a value throughout my program - what I would normally
refer to as a "global" variable.

I see that there is a "global" command - and I assume its use would be
global var_name. This I have coded (works) but I am unable to use it "global
name var_name is not defined".

TIA


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