How
Python doesn’t support ++, but you can do:
number += 1
Why
Simply put, the ++ and — operators don’t exist in Python because they wouldn’t be operators, they would have to be statements. All namespace modification in Python is a statement, for simplicity and consistency. That’s one of the design decisions. And because integers are immutable, the only way to ‘change’ a variable is by reassigning it.
Fortunately we have wonderful tools for the use-cases of ++ and — in other languages, like enumerate() and itertools.count().
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http://stackoverflow.com/questions/2632677/python-integer-incrementing-with