Python练习题1

#输出1，2，3，4，5，6，8，9，10
a = 1
while a<11:
    if a==7:
        pass
    else:
        print(a)
    a = a+1

#计算1到100连加并输出
b = 1
sum = 0
while b<101:
    sum = sum + b
    b = b+1
print(sum)

#输出1-100的奇数
c = 1
while c<101:
    d = c % 2
    if d == 1:
        print(c)
    c = c+1
#输出1-100的偶数
c = 1
while c<101:
    d = c % 2
    if d == 0:
        print(c)
    c = c+1

#计算1-2+3-4....+99并输出
a = 1
sum = 0
while a<100:
    c = a%2
    if c == 1:
        sum = sum + a
    else:
        sum = sum - a
    a = a+1
print(sum)

#用户登陆（三次机会重试）
i = 1
while i<4:
    id = input("请输入用户名：")
    if id == "root":
        print("ok")
        break
    else:
        j = 3-i
        print("您还可以输入",j,"次")
    i = i+1
print("done")