Python学习笔记（八）Python练习题一

#/usr/bin python
#-*-coding:utf8-*-
count = 1
while count <=10:
    if count!=7:
        print(count)
    count=count+1

#/usr/bin python
#-*-coding:utf8-*-
count=1
n=1
while count<100:
    count=count+1
    n=n+count
print(n)

#/usr/bin python
#-*-coding:utf8-*-
count=1
n=1
while count<99:
    count=count+2
    n=n+count
print(n)

#/usr/bin python
#-*-coding:utf8-*-
count=2
n=2
while count<100:
    count=count+2
    n=n+count
print(n)

#/usr/bin python
#-*-coding:utf8-*-
count=1
n=1
while count<99:
    count=count+1
    if count%2 == 0:
        n=n-count
    else:
        n=n+count
print(n)

#/usr/bin python
#-*-coding:utf8-*-
count=3
while count!=0:
    count=count-1
    inp1=input("请输入用户：")
    inp2=input("请输入密码：")
    if inp1=="zengtao":
        if inp2=="zt":
            print("正确，欢迎",inp1)
            count=0
        else:
            print("密码错误，请重试")
            print("您还有",count,"次机会")
    else:
        print("用户或密码错误，请重试")
        print("您还有",count,"次机会")