Python 3 changing variable in function from another function
问题 I would like to access the testing variable in main from testadder, such that it will add 1 to testing after testadder has been called in main. For some reason I can add 1 to a list this way, but not variables. The nonlocal declaration doesn't work since the functions aren't nestled. Is there a way to work around this? def testadder(test, testing): test.append(1) testing += 1 def main(): test = [] testing = 1 testadder(test, testing) print(test, testing) main() 回答1: Lists are mutable, but