Get median of two sorted same sized array

MedianOfTwoArrays.py

# Im trying with same sized array here

array1 = [10,11,12,18,20]
array2 = [2,5,8,15,19]

def GetMedianOfTwoArrays(array1, array2, a1Start, a1End, a2Start, a2End):
    
    # Find medians from the two arrays
    m1 = (a1Start + a1End) / 2
    m2 = (a2Start + a2End) / 2
    
    if (a1End - a1Start == 1 & a2End - a2Start == 1):
        # if we have two 2 sized sorted array here then the median is max(array1[0], array2[0]) + min(array1[1], array2[1]) / 2
        return (max(array1[a1Start], array2[a2Start]) + min(array1[a1End], array2[a2End])) / 2
    
    if (array1[m1] == array2[m2]):
        return array1[m1]
    
    if (array1[m1] > array2[m2]):
        # This essentially means that I have to look from array1Start to mid1 and mid2 to array2End
        return GetMedianOfTwoArrays(array1, array2, a1Start, m1, m2, a2End)
    else:
        # This essentially means that I have to look for mid1 to array1End and array2Start to mid2
        return GetMedianOfTwoArrays(array1, array2, m1, a1End, a2Start, m2)

        

result = GetMedianOfTwoArrays(array1, array2, 0,len(array1)-1, 0, len(array2)-1) 
print(result)