如何确保我只打印一次？

Question

I am a beginner to python, I am trying to create a program that check's the password variability.

The code is finished but when I execute it, it prints the same message multiple times. But I only want it to print once.

def controleer_paswoord(wachtwoord):
    import re
    for item in wachtwoord:
        kleine_letter =  re.search( "[a-z]",wachtwoord)
        hoofd_letter = re.search( "[A-Z]",wachtwoord)
        cijfer = re.search ("[0-9]",wachtwoord)
        karakter = re.search ("[$#@]",wachtwoord)
        lengte = (len(wachtwoord)<6 or len(wachtwoord)>12)
        if kleine_letter == None:
            print("{0} -> Geldig paswoord?  False".format(wachtwoord))
        elif hoofd_letter == None:
            print("{0} -> Geldig paswoord?  False".format(wachtwoord))
        elif cijfer == None:
            print("{0} -> Geldig paswoord?  False".format(wachtwoord))
        elif karakter == None:
            print("{0} -> Geldig paswoord?  False".format(wachtwoord))
        elif lengte == None:
            print("{0} -> Geldig paswoord?  False".format(wachtwoord))
        else:
            print("{0} -> Geldig paswoord?  True".format(wachtwoord))

# wachtwoord = (input("Geef hier uw gewenste wachtwoord in:" ))
wachtwoord = "2w3E"
controleer_paswoord(wachtwoord)

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what I get:

#2w3E -> Geldig paswoord?  False
#2w3E -> Geldig paswoord?  False
#2w3E -> Geldig paswoord?  False
#2w3E -> Geldig paswoord?  False

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what I want:

#2w3E -> Geldig paswoord?  False

Answer 1

At for item in wachtwoord: you are iterating over each character in the string, which seems to be unintended. It dosen't seem like you use item anywhere inside the for loop, so it just repeats the process the same way for each character. Try removing that line

Answer 2

You print for every character in the password. Remove that loop. The re searches go through the entire password, so you don't need to loop through the characters. The big clue is that you never use item within the loop -- so you are not really iterating through the string.

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One helpful debugging hint: make your print statements unique, so you can tell why you failed on each iteration.