python - What is the meaning of "spam = spam + 1"

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Answer 1

As noted, spam = spam + 1 increases the value of spam by one.

That makes more sense if the program you are looking at is actually this:

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

Now the spam = spam + 1 is part of the loop body ... and whole program is going to print "Hello, world" 5 times.

Indentation is significant to the meaning of a program in Python.