关于while循环的一般学习问题

Question

So for the basic code below. I thought the spam = spam + 1 would be adding 1 to the local variable spam, but it appears to add it to the global ( or else why would you start with the global variable spam = 0) . I thought local variables only exist within the function( starting after the colon.) It seems like this should not work considering local/global scopes?

  spam = 0
    while spam < 5:
        print('Hello, world.')
        spam = spam + 1

Answer 1

The while loop doesn't create a new scope. Scopes are only established by function and class definitions. The while loop is not a function definition.

So the spam = 0 and spam = spam + 1 statements are in the same scope, since there's no function definition around either of them.