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def generate_password(password_length=10, letters=False, digits=False, special=False):
    """Generating strong random passwords using
       ASCII_LETTERS, DIGITS and SPECIAL_CHAR.
       int for password length. default  len of
       10 characters.
    """
    characters = ""
    if letters:
        characters += ASCII_LETTERS
    if digits:
        characters += DIGITS
    if special:
        characters += SPECIAL_CHAR

    if not characters:
        characters = ASCII_LETTERS + DIGITS + SPECIAL_CHAR
    return "".join(random.choices(characters, k=password_length))

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def main():
    """Generate Password on module start"""
    try:
        password_length = int(input("# Password length: "))
    except ValueError:
        print("Input must be INTEGER, using default Values")
        password_length = 10
    print(generate_password(password_length))

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    def generate_password(self):
        """Generating passwords and filling listWidget"""
        self.listWidget.clear()
        letters = self.checkLetters.isChecked()
        digits = self.checkDigits.isChecked()
        special = self.checkSpecial.isChecked()

        try:
            password_length = int(self.lenText.text())
        except ValueError:
            password_length = 10

        for _ in range(17):
            self.listWidget.addItem(
                generate_password(password_length, letters, digits, special)
            )
        color = "red" if password_length < 8 else "orange" if password_length < 10 else "lime"
        self.lineStrongness.setStyleSheet(f"background-color: {color};")

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color = "red" if password_length < 8 else "orange" if password_length < 10 else "lime"