Can not increment global variable from function in python [duplicate]

Answer 1

This is because globals don't bleed into the scope of your function. You have to use the global statement to force this for assignment:

>>> COUNT = 0
>>> def increment():
...     global COUNT
...     COUNT += 1
... 
>>> increment()
>>> print(COUNT)
1

Note that using globals is a really bad idea - it makes code hard to read, and hard to use. Instead, return a value from your function and use that to do something. If you need to have data accessible from a range of functions, consider making a class.

It's also worth noting that CAPITALS is generaly reserved for constants, so it's a bad idea to name your variables like this. For normal variables, lowercase_with_underscores is preferred.

Answer 2

its a global variable so do this :

COUNT = 0

def increment():
    global COUNT
    COUNT = COUNT+1

increment()

print COUNT

Global variables can be accessed without declaring the global but if you are going to change their values the global declaration is required.