12、python基础学习-for循环，12python基础-for, 1 #__auth

12、python基础学习-for循环，12python基础-for, 1 #__auth

 1 #__author: hlc 2 #date: 2019/5/25 3  4 # for i in range(1,100,2) : #2为步长 5 #     print("loop:",i) 6  7 # for i in range(100) : 8 #     if i < 20 or i > 80 : 9 #         print(i)10 #11 # _user = "abc"12 # _passwd = "123"13 #14 # flag = False15 # for i in range(3) :16 #     username = input("your usernaem>>>: ")17 #     password = input("your password>>>: ")18 #     if username == _user and password == _passwd :19 #         print("Welcome %s login ..." % _user)20 #         flag = True21 #         break #跳出 ，中断22 #     else:23 #         print("Invalid username or password !")24 # if not flag :25 #     print("错误次数过多！。。。")26 #27 # C:\python37\python.exe D:/python-note/for_loop.py28 # your usernaem>>>: sdaf29 # your password>>>: asdf30 # Invalid username or password !31 # your usernaem>>>: abc32 # your password>>>: 12333 # Welcome abc login ...34 35 # C:\python37\python.exe D:/python-note/for_loop.py36 # your usernaem>>>: a37 # your password>>>: a38 # Invalid username or password !39 # your usernaem>>>: a40 # your password>>>: a41 # Invalid username or password !42 # your usernaem>>>: a43 # your password>>>: a44 # Invalid username or password !45 # 错误次数过多！。。。46 47 _user = "abc"48 _passwd = "123"49 50 for i in range(3) :51     username = input("your usernaem>>>: ")52     password = input("your password>>>: ")53     if username == _user and password == _passwd :54         print("Welcome %s login ..." % _user)55         break #跳出 ，中断56     else:57         print("Invalid username or password !")58 else:59     print("错误次数过多！。。。")60     61 # C:\python37\python.exe D:/python-note/for_loop.py62 # your usernaem>>>: sdf63 # your password>>>: sadf64 # Invalid username or password !65 # your usernaem>>>: asdf66 # your password>>>: asdf67 # Invalid username or password !68 # your usernaem>>>: asdf69 # your password>>>: asdf70 # Invalid username or password !71 # 错误次数过多！。。。

12、python基础学习-for循环