You can do something like:

def median(j):
    if len(j) < 2 : return j if j ==[] else j[0]
    j = sorted(j)
    length = len(j)-1
    return j[length//2] if (length + 1) % 2 else (j[length//2] + j[length//2+1])/2

I used j since list is a function by itself