第七天

list = [8,4,2,1,23,344,12]

sum = 0

for x in list:

print('数字的值',x)

sum += x

print('和',sum)

num = int(input('请输入数字'))

if list.count(num ) == 0:

print('数字不存在')

else:

print('存在')

arrScore =[]

# i = 1

# while i<=3:

# s = float(input('请录入第%d个人的成绩:'%i))

# i +=1

# arrScore.append(s)

# arrScore.sort()

# print(arrScore)

users = [['tom1','123'],['tom2','123']]
flag = False
name = input('请输入用户名')
pwd = input('请输入用密码')
for u in users:
if nameu[0] and pwdu[1]:
flag= True
break
if flag:
print('登录成功')
else:print('用户名或密码错误')