Python functions

Where this idea appears

A calculation used for several records can be treated as one reusable operation. Thinking about what goes in and what comes back gives it a clear role.

One responsibility can serve several situations

A function gives a particular piece of work a name. It can receive information as input and may return a result. A calculation used on several screens can have one defined responsibility, even when each screen supplies different values.

Showing a result and returning a result are separate actions. A program may need a calculated total for another decision before anything appears on screen. Understanding that difference makes functions easier to recognise as parts that work together, rather than isolated blocks of instructions.

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Source

• Python tutorial: conditions, loops, and functions

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