密码生成器elif分支逻辑异常：输入数字仍触发错误提示

问题根源 #

Tkinter的Entry组件通过get()方法获取的内容永远是字符串类型——哪怕用户输入的是数字，type(passwordLength)的结果也始终是str。你代码里的elif type(passwordLength) != int条件永远为真，所以输入数字时仍会触发错误提示。

修复方法一：用字符串isdigit()方法判断 #

适合仅需校验正整数长度的场景，代码修改如下：

def PasswordGenerationFunc():
    password = None
    passwordLength = inputPasswordLength.get()
    userName = inputUsername.get()

    if len(passwordLength) == 0:
        ResultDisplay.configure(text="Length of password is mandatory.", fg="red")
    elif not passwordLength.isdigit():
        ResultDisplay.configure(text=f"Only digits are allowed. You entered: {passwordLength}", fg="red")
    else:
        passwordLength = int(passwordLength)
        # 执行后续密码生成逻辑...

说明：isdigit()仅识别纯数字字符，不支持负号、小数点，符合密码长度为正整数的需求。

修复方法二：尝试转换为int并捕获异常（更健壮） #

这种方式能处理所有非数字输入的情况，还可额外校验长度合法性：

def PasswordGenerationFunc():
    password = None
    passwordLength = inputPasswordLength.get()
    userName = inputUsername.get()

    if len(passwordLength) == 0:
        ResultDisplay.configure(text="Length of password is mandatory.", fg="red")
    else:
        try:
            passwordLength = int(passwordLength)
            # 额外校验：密码长度必须为正整数
            if passwordLength <= 0:
                ResultDisplay.configure(text="Password length must be a positive number.", fg="red")
                return
            # 执行后续密码生成逻辑...
        except ValueError:
            ResultDisplay.configure(text=f"Only digits are allowed. You entered: {passwordLength}", fg="red")

内容的提问来源于stack exchange，提问作者Stephan Koenig