如何阻止我的程序生成相同的密钥？

Question

I writing a password generator and I ran into this annoying issue, and it is the repeating aa number or letter on the same line. The user gives the program a format on how they want their password to be generated ex "C@@d%%%" where @ is only letters and where % is only numbers, and the user also inputs the numbers and letters to generate the password, then the program is suppose to print out something like cold123, but instead it prints out cood111 or clld111, I will post a snippet of my code below, but please don't bad mouth it, I'm fairly new to python, self-taught and just about couple of months into the python experience.

class G()
    .
    .
    .

    # self.forms is the format the user input they can input things such as C@@d%%% 
    # where @ is only letters and where % is only numbers

    # self.Bank is a list where generated things go 

    AlphaB = [] #list Of All Of The Positions That have The @ sign in The self.forms 
    NumB = [] #list of All of the positions that have a % sign
    for char in self.forms: 
        if char == '@':
            EOL=(self.Position) # Positions End Of Line
            Loc = self.forms[EOL] # Letter
            AlphaB.append(EOL)  


        if char == '%':
            EOL=(self.Position)
            Loc = self.forms[EOL]
            NumB.append(EOL)
        self.Position+=1 # Move right a position

    for pos in AlphaB: 
        for letter in self.alphas: #letters in The User Inputs
            GenPass=(self.forms.replace(self.forms[pos],letter))
            #Not Fully Formatted yet, because Only The letter been formatted
            if GenPass.find('%'):
                for Pos in NumB:
                    for number in self.ints:
                        GenPass=(GenPass.replace(GenPass[Pos],number))
                        if GenPass not in self.Bank:
                            #Cood111
                            print (GenPass)
                            self.Bank.append(GenPass)

            else:
                if GenPass not in self.Bank:
                    print (GenPass)
                    self.Bank.append(GenPass)

Answer 1

GenPass.replace(GenPass[Pos],number) will replace every occurrence of the character at GenPass[Pos] with the value of number . You need to make sure you replace one character at a time.

Answer 2

创建所有字符的列表和包含所有nums的列表，然后使用list.pop（randint（0，len（list） - 1）选择一个，你总是会选择一个不同的字母/数字，但你也会限制为10位数（0-9）和20位字母。