P42for loop, break statement

Loop Loop: 
         1. finite loop 
         2. infinite loop (infinite loop) 
         
         
for loop: 
    #i is variable #range (start x, end to y, z steps of the cycle) 
        for I in Range (x, y, z ): # i assigned to the circulation range #range range    
            Print (i) # i output 


example: 
       for i in range (2,6): Z is a step # 1 may not write default; 
           Print (i)   
output: 
       > >> [2,3,4,5] 

for example: 
       for I in Range (1, 10,): Z is a step # 2, i.e. 2 followed by progressive press 
           print (i) 
output: 
       >>> [1 , 3,5,7,9] 


seeking odd 1-100: 
method. 1:   
   for I in Range (1,101): 
        IF I. 1% 2 ==: 
            Print ( "Loop:", I) 
method 2: 
    for I in Range (1,101,2) 
        Print (I) 

find the number 100, but in addition the number of 50-70;
    for i in range(1,101):
        if i<50 or i>70:
            print(i,end=" ")
  

输入3次密码:

for i in range(3):

 _user   =  "leng"
 _passwd =  "wxc"


 username = input("username:")
 password = input("password:")


 if username == _user and password == _passwd:
    print("welcome %s login %s....."%(_user,_passwd))
    break;
 else:
    print("invalid username or password !")
    
进阶:
   
for i in range(3):
        _user   =  "leng"
        _passwd =  "wxc"

        panduan = False
        username = input("username:")
        password = input("password:")
    

        _user username and password == IF == _passwd: 
            Print ( "the Login is available for purchase% S% S ....."% (_ the User, _passwd)) 
            panduan = True 
            BREAK 
        the else: 
            ( "! invalid username or password") Print 
IF not panduan: # under false circumstances, the conditions established 
    print ( "test too much") 
    
#if not: if it is false, then the output of the X- 
    Print (the X-) 


as Advanced: 

for i in the Range (3): 
        _user = "Leng" 
        _passwd = "WXC" 

        username = INPUT ( "username:") 
        password = INPUT ( "password:") 
    
        IF username and password == == _user _passwd: 
            Print ( "Login available for purchase% S% S .... . "% (_ user,_passwd)) 
            after the break #break interrupt the cycle for, would not face execution last else statement
        else: 
            ( "! invalid username or password") Print 
# long as the above normal for loop is finished, the middle not be interrupted, will be executed else statement 
else: 
    Print ( "try too much") 
behind only add #for else while too