[Python] How to programm a function yielding average value of a list of values using...

It's hard to apply functional programming to python in a strict way. Particulary if a counter is needed changing for any invokation using recursion. Any recommendations?

My solutions so far are mediocre like calc_average(count, list) ...

How can I modify to avoid providing two parameters to the function instead of one (the list itself) ?

def calc_average(anzahl,nums):
match nums:
case():
return 0
case(summe, *rest):
return (summe/anzahl + calc_average(anzahl,rest))

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