taking a list of numbers as input in one line

def mean(li):
    x = sum(li)
    x = float(x)
    z = len(li)
    z = float(z)
    return x/z
print ("Enter how many elements do you want to enter?")

n = int(raw_input())
ls = [int(i) for i in raw_input().split()]
print(ls)
print (' '.join(str(x) for x in ls))
ans = mean(ls)
print(ans)