PythonDay_03

1. The functions and modules using

1) Defined Functions

You can use `def` keyword to define a function in Python

It can be passed after the function name is placed in parentheses to the parameters of the function

And after the function execution is complete we can return a value by `return` keyword

------ adjusted reconstruction of the code structure of the code in the code without affecting the result of execution

Function Structure

DEF defineName ([params]): 
    ........... 
　　# executable 
    ........... 
    return ..... 
 call: 
     defineName ([params])

Python function expansion

# In front of the parameter name is args * indicates a variable parameter
# that is 0 or more can pass parameters when calling the function add

Function uses the tips:

1. First will write the bare code and need to see where repeating
2. Next will need to reuse the code into parameter, brought into the function.

Function uses the classic example

Example 1: order form (required by the conditions, see if there are goods, then fill orders, shipments)

Enter the information required to verify the legal

DEF Address ():
         Print ( ' Please fill in the information ' )
         Print ( ' Please enter your name: ' ) 
        name = the INPUT ( ' the Name ' )
         Print ( ' Please enter the phone: ' ) 
        Phone = the INPUT ( ' Phone ' )
         Print ( ' enter address: ' ) 
        Addr = iNPUT ( ' Addr ' ) 
        RES =check_Information (name, Phone, Addr)   
         IF   RES: 
            Note () 
        return False 

DEF Note ():
         Print ( ' submit orders, shipping immediately ' ) 

DEF Start ():
     Print ( ' Welcome ' ) 
    G = the INPUT ( ' goods : ' ) 
    Check (G) 
  
the Start ()

 

Example 2 Examples of user registration (verification code)

global_connt = 0
def User():
    user_ = input('User:>>')
    Z ='QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm'
    N ='1234567890'
    T ='.*&^%$#@!~'
    is_Z = False
    is_N = False
    is_T = True
    for i in user_:
        if i in Z:
            is_Z =True
         IF I in N: 
            is_N = true
         IF I in T: 
            is_T = true
     IF is_Z and is_N and is_T: 
        Password () 
    the else :
         Print ( ' Account must also not be alphanumeric and there (# $% ^ & *. ! @ ~) ' ) 

DEF password (): 
    the Passwd = iNPUT ( ' enter password: >> ' )
     IF len (the Passwd) <. 6 :
         Print ( 'The password must be greater than 6 ' )
     the else : 
        Phone () 

DEF Phone (): 

    Phone = INPUT ( ' Enter phone number ' )
     IF len (Phone) =. 11! :
         Print ( ' Invalid phone number ' )
     the else :
         Print ( ' code sent ' ) 
        Verfily_number () 

DEF Verfily_number ():
     # declared as a global variable 
    global global_connt
     Import Random
     Import Time 
    NUMRandom.randrange = (1000,9999 ) 
    global_connt + =. 1 
    START_TIME = the time.time ()
     Print ( ' system codes to verification code is: D% ' % NUM) 
    num_ = int (INPUT ( ' Enter Code: ' )) 
    end_time = time.time () 
    SUB_TIME = end_time- start_time
     IF SUB_TIME> 10 :
         IF global_connt> 2 :
             Print ( ' you might be a robot ' ) 
            Exit () 
        Print ( 'Code timeout, retransmission is about to ... ' ) 
        the time.sleep ( 2 ) 
        Verfily_number () 
    the else :
         IF NUM == num_:
             Print ( ' verification success ' )
         the else :
             Print ( ' Code error ' ) 
            the time.sleep ( 2 ) 
            Verfily_number () 

DEF Start ():
     Print ( ' Please register personal information ' ) 
    the User () 

Start ()

2. Character and character structure

DEF main (): 
    str1 = ' ! Hello, World ' 
    # calculation function of the length len of the string by the 
    Print (len (str1))   # 13 is 
    # obtain capitalized string copy 
    Print (str1.capitalize ())   # the Hello , World! 
    # after obtaining copies of the string becomes uppercase 
    Print (str1.upper ())   # HELLO, WORLD! 
    # locate a substring from a string location 
    Print (str1.find ( ' or ' ))   # . 8 
    Print ( str1.find ( ' shit ' ))   # -1 
    #And find similar, but throws an exception if can not find the substring 
    # print (str1.index ( 'or')) 
    # print (str1.index ( 'shit')) 
    # check whether the string starts with the specified string of 
    Print ( str1.startswith ( ' of He ' ))   # False 
    Print (str1.startswith ( ' HEL ' ))   # True 
    # checks whether the string ends with the specified string 
    Print (str1.endswith ( ' ! ' ))   # True 
    # will centered string specified width on both sides and to fill the specified character 
    Print (str1.center (50, ' * ' ))
     # string is placed in a specified width to the right side of the filler specified character
    Print (str1.rjust (50, '  ' )) 
    str2 = ' abc123456 ' 
    # character string extracted from the specified position (subscripting) 
    Print (str2 [2])   # C 
    # string sections (from a specified start to the specified index end index) 
    Print (str2 [2:. 5])   # C12 
    Print (str2 [2:])   # c123456 
    Print (str2 [2 :: 2])   # C246 
    Print (str2 [:: 2])   # ac246 
    Print (str2 [:: -. 1])   # 654321cba 
    Print (str2 [-3: -1])   # 45 
    # checks for string comprised of a digital
    Print (str2.isdigit ())   # False 
    # Check whether the letter string constituting 
    Print (str2.isalpha ())   # False 
    # checks a string of numbers and letters to constitute 
    Print (str2.isalnum ())   # True 
    Str3 = '   [email protected] ' 
    Print (Str3)
     # obtain a copy of the space around a string trimmer sides 
    Print (str3.strip ()) 


IF  the __name__ == ' __main__ ' : 
    main ()