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How to Manipulate Variable Value inside a Function When The Variable was Declared Outside the Function?

debugcn Published at Dev
15
KingMak

I would like to increase the value of variable count by 1, but only when the function printcount is called in the CODE below.

global count
count = 0

def PrintCount():
    count += 1
    print count

PrintCount()

When I run this code I get the following error:

Traceback (most recent call last):
  File "C:\Users\Cross\Desktop\Code.py", line 8, in <module>
    PrintCount()
  File "C:\Users\Cross\Desktop\Code.py", line 5, in PrintCount
    count += 1
UnboundLocalError: local variable 'count' referenced before assignment

I would like to know why this is happening and how to fix it.

Thank You.

falsetru

Use global keyword inside the function to access (especially modify) the global variable count:

def PrintCount():
    global count # <----
    count += 1
    print count

Declaring global outside the function has no effect.

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