捕获多个异常不起作用

Question

我尝试使用try除了捕获多个异常。然而，我仍然无法捕捉到两个期望和错误打印出来如下。任何帮助表示赞赏

public Boolean isValidLength(String s) {
    return s.length == 6;
}

//this checks all characters of the string though, 
//your javadoc said something about checking the last 5 characters..
public Boolean hasValidDigits(String s) {
    for(int i=1; i<s.length(); i++)
        if (!Character.isDigit(s.charAt(i)))  {
            return false;
        }
    }
    return true;
}

public Boolean isValidAccountNum(String s) {
  return isValidLength(s) && isValidStart(s) && hasValidDigits(s);
}

def try_expection(self:
    try:
        el = self.element.test_function()
    except (AttributeError, TypeError):
        el = self.driver.test_function()

Error:
def try_expection(self):
    try:

     

E AttributeError：＆＃39; NoneType＆＃39;对象没有属性＆＃39; test_function＆＃39;