python第一次作业


# 1、使用while循环输入 1 2 3 4 5 6 8 9 10
1 i = 1
2 while i < 11:
3     if i!= 7:
4         print(i)
5     else:
6         pass
7     i+=1
# 2、求1-100的所有数的和
i = 1
sum = 0
for i in range(1,101):
    i = i+sum
    sum = 0+i
print(sum)
# 3、输出 1-100 内的所有奇数
for i in range(1,101):
    if i%2 == 1:
        print(i)
    i = i+1
# 4、输出 1-100 内的所有偶数
i = 1
while i < 101:
    if i%2 == 0:
        print(i)
    i +=1
# 5、求1-2+3-4+5 ... 99的所有数的和
sum_i = 1
for i in range(1,101):
    if i%2 == 1:
        #print(i)
        sum_i = sum_i + i
    i = i+1
#print(sum_i)
j = 1
sum_j = 2
while j < 101:
    if j%2 == 0:
        #print(j)
        sum_j = sum_j +j
    j = j+1
sum = sum_i - sum_j
print("1-2+3-4+5 ... 99的所有数的和是{}".format(sum))
print("1-2+3-4+5 ... 99的所有数的和是%s"%(str(sum)))
print("1-2+3-4+5 ... 99的所有数的和是{0}".format(sum))
print("1-2+3-4+5 ... 99的所有数的和是{sum}".format(sum = sum))
# 6、用户登陆(三次机会重试)
count = 0
sum = 2
username = "XF"
password = "123456"
while count < 3:
    usr = str(input("请输入账号:")).strip()
    psd = str(input("请输入密码:")).strip()
    if usr == username and psd == password:
        print("登录成功")
        break
    elif usr == username and psd != password:
        sum = sum - count
        print("密码错误,还有%s次输入机会"%sum)
    elif usr != username and psd == password:
        sum = sum - count
        print("无此账号,还有%s次输入机会"%sum)
    elif usr != username and psd != password:
        sum = sum - count
        print("账号名或密码错误,还有%s次输入机会"%sum)
    count = count+1

 







posted @ 2018-12-10 22:42  高母寨寨委书记  阅读(202)  评论(0编辑  收藏  举报