11 functions part two

In this python video we will learn about functions with parameters and make our function give us something in return. Previously we learned that a function is, but in this video, we will make functions that are a bit more useful.
Timestamps:
- Intro: 0:00​
- Write validate functions: 1:50
- Testing function: 5:09
- Call function in a for loop: 5:28
- Testing with for loop: 6:03
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