question on global variables

[Harry George]

mongo57a at comcast.net writes:

> 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
> 
> 

mydata=0
print mydata --> 0

def myfunc1(x):
    mydata=x

myfunc1(5)
print mydata --> 0

def myfunc2(x):
    global mydata
    mydata=x

myfunc2(5)
print mydata --> 5

That is, "global" allows globally defined data to be modified from
inside a function.  Otherwise it is read only, and treated as a local
variable.

Of course, you should consider capturing "global" data in some object,
so you can isolate it if you need to do threads.


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-- 
Harry George
hgg9140 at seanet.com