Author: Khan Academy via YouTube
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What happens when you pass a list as an argument to a function? Python passes arguments by assignment, not pass-by-value or pass-by-reference. Mutating a list parameter inside a function, then, can have side effects! Trace how the computer handles mutable and immutable argument types in memory.

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TIMESTAMPS:
00:00 : passing a primitive type
00:40 : memory representation – float argument
01:09 : memory representation – list argument
01:41 : mutating the list argument
02:19 : immutable vs. mutable arguments
02:46 : risks of functions side effects
03:27 : accumulator pattern
03:48 : documenting side effects
04:12 : summary

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