python(三)——while语句
while死循环
1 #!/usr/bin/env python 2 #-*- coding:utf8 -*- 3 4 import time 5 while 1 == 1: 6 print('Ok',time.time())
import time count = 0 while count < 10: print('Ok',time.time()) count = count + 1 print('123')
# 输出1-100内所有的偶数 count = 1 while count <= 100: if count % 2 == 0: print(count) count = count + 1
# 求 1-2+3-4+5-6...99所有数的和 count = 1 sum = 0 while count < 100: temp = count if count % 2 == 0: temp = -count sum += temp count = count + 1 print(sum)
# while 输出1 2 3 4 5 6 7 8 9 n = 0 while n < 10: if n == 7: pass else: print(n) n = n + 1
#!/usr/bin/env python #-*- coding:utf8 -*- # 允许用户登录三次 # 变量 count = 0 while count < 3: n1 = input('请输入用户名:') n2 = input('请输入用户名密码:') if n1 == 'root' and n2 == 'root123': print('登录成功') count = 3 else: print('登录失败') count = count + 1