For i, are very use for things like fill things, create list, something that follows a pattern, also create loops
While are for things that change over the time like a user input, also it helps to validate things and create loops
If you have still doutbs please look this:
If and For in Reference in Python3 Official Source
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Enjoy.
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Here is the link to the video for mastery 19:
Here is the link to video for mastery20:
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Use of loops with “for”
Nesting of conditional statements
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