python之循环

1 for i in range(3):
2     print(i)

0
1
2

1 input_name = input("name:")
2 input_passwd = input("password:")
3 counter = 0
4 for i in range(3):
5     if input_name == "solo" and input_passwd == "123" :
6         print("welcome to login")
7     else:
8         print("ERROR!")
9         counter += 1

if 条件成立:
    print()
    
else:
    print()

if 条件成立:
    print()
    
elif 条件1：
    print()

elif 条件2：
    print()
    
else:
    print()

while     条件成立：
        print()

1 if 条件成立：
2     print()
3     break #跳出整个循环
4 else:
5     print()

1 for i in range(3):
2     continue
3 print(i)

 1 for i in range(3):
 2     if input_name == "solo" and input_passwd == "123" :
 3         print("welcome to login")
 4         
 5     elif input_name == "admin" and input_passwd == "abcd123"
 6         print("Administrator login")
 7     
 8     else:
 9         print("Logain Error!")
10         counter += 1