Functions That Python Provides

Python comes with many built-in functions that perform common operations. One example is abs, which produces the absolute value of a number:

 >>>​​ ​​abs(-9)
 9
 >>>​​ ​​abs(3.3)
 3.3

Each of these statements is a function call.

The general form of a function call is as follows:

 function_name(arguments)

An argument is an expression that appears between the parentheses of a function call. In abs(-9), the argument is -9.

Here, we calculate the difference between a day temperature and a night temperature, as might ...

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