for 循环，if 判断

#Author:    Administrator
#Date:  2019/12/7

#print jishu
#method 1
# for i in range(1,101):
#     if i % 2 == 1 :
#         print( "loop:"+i)

#method 2
# for i in range(1,101,2):  #2代表步长
#     print( "loop:",i)

# for i in range(1,101):
#     if i % 2 == 1:
#         if 50 <=i<=70:
#             continue
#         else:
#             print("loop:",i)

#method 3
# for i in range(101):
#     if i > 50 or i <70:
#         if i % 2 == 1:
#             print("loop:",i)


#三次机会进行用户登陆，for 循环实现

_User="Wythe"
_Passwd="Wythe123"

for i in range(3):
    username=input(">>Username:")
    password=input(">>Password:")
    if username == _User and password == _Passwd:
        print("Welcome %s to login" % _User)
        #print("Welcome %s to login" ,% _User) #加","号会报错
        break
    else:
        print("Invaild  username or password!")