Chapter 11 Manipulating Numbers
11.1 Introduction
Just like every high-level programming language, Python provides many ready-to-use functions and methods (called subprograms) that you can use whenever and wherever you wish.
A “subprogram” is simply a group of statements packaged as a single unit. Each subprogram has a descriptive name and performs a specific task.
To better understand functions and methods, let's take Heron's[11] iterative formula that calculates the square root of a positive number.
.
where
►y is the number for which you want ...
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