Functions

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Functions package a small idea behind a name.

Contract

A function should have a clear contract:


python
def double(x):
    return x * 2

The function receives x, computes x * 2, and sends that result back to the caller.

return gives a value back to the program. print shows a value to the human.


python
answer = double(5) + 1

double(5) returns 10, so answer becomes 11.

Write a one-sentence contract before coding a function.

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