python ÁбíÈ«ÅÅÁÐ

def perm(data):
    if len(data) == 1:
        return [data]
    r = []
    for i in range(len(data)):
        s = data[:i] + data[i+1:]
        p = perm(s)
        for x in p:
            r.append(data[i:i+1]+x)
    return r

arr = [1,2,3]
print(perm(arr))