[Solved] What does this `key=func` part mean in `max(a,b,c,key=func)` in Python?

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it allows to define a criterion which replaces the < comparison between elements.

For instance:

>>>l = ["hhfhfhh","xx","123455676883"]
>>>max(l, key=len)
'123455676883'

returns the longest string in the list which is "123455676883"

Without it, it would return "xx" because it’s the highest ranking string according to string comparison.

>>>l = ["hhfhfhh","xx","123455676883"]
>>>max(l)
'xx'

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solved What does this `key=func` part mean in `max(a,b,c,key=func)` in Python?