... numbers:

I used == because in Python == is used for testing if two things are equal.

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... numbers.

Python allows more types of variables. For example, later in the tutorial we will learn about lists and functions.

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... last.

Technically range returns an iterator and for takes an iterator, which saves memory and is why the for loop does not need to have range converted to a list first.

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... cal.py)

import actually looks for a file named calendar.py and reads it in. If the file is named calendar.py and it sees a `import calendar' it tries to read in itself which works poorly at best.

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