Calculate Mean, Median, and Mode Python

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#!/usr/bin/env python
def mean(arr, geometric= False):
    if arr == []:
        return None
    if geometric:
        prod = 1
        for i in arr:
            prod *= i
        return round(prod**(1/len(arr)), 2)
    else:
        return sum(arr)/len(arr)
def median(arr):
    if arr == []:
        return None
    arr.sort()
    if len(arr)%2 != 0:
        return arr[len(arr)//2]
    else:
        return (arr[len(arr)//2 - 1] + arr[len(arr)//2])/2
def mode(arr):
    if arr == []:
        return None
    counts = {}
    for i in set(arr):
        count = arr.count(i)
        counts[count] = i
    return counts[max(counts.keys())]
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