day13 practice

"" " 
5.1 verify the legality of e-mail string 
requirements: 
. @ 1. not contain before (in the bar) -, and other symbols such as $ &, but may contain, at the beginning of letters and numbers 
2. Universal Naming is_valid_email () 
3. after @ number or letter 
 suffix .com | .gov | .net any one end 
reference: test the legality 
1. [email protected] true 
2. [email protected] true 
3. [email protected] true 
4 . [email protected] false 
5. [email protected] true 
"" " 
Import Math 
Import Re 

DEF email_path_before_chack (STR): 
    IF Not the re.compile (" ^ [A-zA-Z0-9] [A- Z0-9-zA,] * $ '.' ') match (str):. 
        Print ( "e-mail address input error")
        return False
    return True

def email_path_last_chack(str):
    Not the re.compile IF ( "^ [A-zA-Z0-9, '.'] * $") match (str.split () [0] "."):. 
        Print ( "E-mail Address input errors suffix ") 
        return False 

    IF not str.split (" ") [1] in [" COM "," GOV "," NET "]:. 
        Print (" E-mail Web site address input error ") 
        return False 
    return True 

DEF is_valid_email (email_path ): 
    IF "@" not in email_path: 
        Print ( "the address format is incorrect, there is no @") 
        return 
    IF not email_path_before_chack (email_path.split ( "@") [0]): 
        return 
    IF not email_path_last_chack (email_path.split ( "@") [. 1]): 
        return 
    Print ( "{} is a valid email address."format (email_path)) 
    return 
DEF main (): 
    the while True: 
        email_path the INPUT = ( "Please enter the e-mail address: \ n")
        if email_path == "exit": 
            BREAK 
        is_valid_email (email_path) 
IF __name__ == "__main__": 
    main () 


program execution results
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