1、使用while循环输出1 2 3 4 5 6 8 9 10
count = 1
while count < 11:
if count == 7: pass else: print(count) count = count + 1
2、输出1--100内所有奇数
count = 1
while count < 101:
a = count % 2
if a != 0: print(count) count = count + 1
3、输出1--100内所有偶数
count = 1
while count < 101:
a = count % 2
if a != 1: print(count) count = count + 1
4、求1--100所有数的和
n = 1
s = 0 while n < 101: s = s + n n = n + 1 print(s)
5、求1-2+3-4+5 ... 999所有数的和
n = 1
s = 0 while n < 100: a = n % 2 if a != 0: s = s + n else: s = s - n n = n + 1 print(s)
6、用户登陆（3次机会）
user_name = "root"
user_passwd = "root123" count = 1 while count < 4: user = input("请输入用户名：") passwd = input("请输入密码：") if user == user_name and passwd == user_passwd : print("welcome",user) else: print("您输入的用户名或密码错误，请重新输入，错误数次：",count) count = count + 1 while count == 4: print("您输入的次数过多，请稍后再试！") break
