"""    遍历整个列表
"""list_test = [1,2,3,4,5,6]
for i in range(len(list_test)):
    print('列表第'+ str(i)+'个元素为:'+str(list_test[i]))
for value in list_test:
    print('列表元素有'+str(value))

"""    练习题
"""list_sum = []
for value in range(21):
    list_sum.append(value)
print(list_sum)
print(sum(list_sum))