根据伪代码写出phyton代码

def selection(a):
    n = len(a)
    a = [0] + a
    for i in range(1,n):
        min = i
        for j in range(i+1, n+1):
            if a[min]>a[j]:
                min = j
        tmp = a[min]
        a[min] = a[i]
        a[i] = tmp
    return a[1:]