python how to change the global variables [duplicate]

Question

I would like to get some kind of confirmation that the upload is success, I have my methods defined similar to the following. However the value of global variable is not changing. Please help

global upload_confirm
upload_confirm = False

def confirm_upload():
    upload_confirm = True

def start_new_upload():
    confirm_upload()
    while (upload_confirm != True):
        print "waiting for upload to be true"
        time.sleep(5)
    if (upload_confirm == True):
        print "start Upload"

start_new_upload()

Answer 1

You could try this:

def confirm_upload():
    global upload_confirm
    upload_confirm = True

Since you are doing upload_confirm = True in a local scope, Python treat it like a local variable. Hence, your global variable stays the same.