django - Django内部服务器错误(接受1个参数(给定2个))

Question

当我尝试提交此DJango表单时，收到内部服务器错误“TypeError:valid_month()恰好接受1个参数(给定2个)”。在我看来，我只是将一个参数传递给valid_month()，而不是两个。您能帮我了解我在做什么错吗？我正在使用Google App Engine启动器对此进行测试。

import webapp2

form="""
<form method="post">
    What is your birthday?<br>
    <label>
        <input type="text" name="month">
    </label>
    <label>
        <input type="text" name="day">
    </label>
    <label>
        <input type="text" name="year">
    </label>
    <br><br>
    <input type="submit">
</form>
"""

表格

class MainHandler(webapp2.RequestHandler):
    def valid_day(day):
        if day.isdigit() and int(day) in range(1, 32):
            return int(day)

    def valid_month(month):
        months = {'jan':'January', 'feb': 'February', 'mar':'March', 'apr':'April','may':'May',
                    'jun':'June', 'jul': 'July', 'aug': 'August', 'sep': 'September',
                    'oct': 'October', 'nov': 'November', 'dec': 'December'}
        m = month.lower()[:3]
        if m in months:
            return months[m]

    def valid_year(year):
        if year.isdigit() and int(year) in range(1900, 2021):
            return year

    def get(self):
        self.response.headers['Content-Type'] = 'text/html'
        self.response.out.write(form)

    def post(self):
        user_month = self.valid_month(self.request.get('month'))
        user_day = self.valid_day(self.request.get('day'))
        user_year = self.valid_year(self.request.get('year'))
        if not(user_month and user_day and user_year):
            self.response.out.write(form)
        else:
            self.response.out.write("You entered a valid date")




app = webapp2.WSGIApplication([('/', MainHandler)], debug=True)

提交表单时，我收到以下回溯:

>追溯(最近一次通话):文件
>“/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py”，
> 1535行，在__call__
> rv = self.handle_exception(请求，响应，e)文件“/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py” ，
> 1529行，在__call__
> rv = self.router.dispatch(请求，响应)文件“/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py” ，
>行1278，在default_dispatcher中
>返回route.handler_adapter(请求，响应)文件“/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py”，
>行1102，在__call__中
>返回handler.dispatch()文件“/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py”，
> 572行，在调度中
>返回self.handle_exception(e，self.app.debug)文件“/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py ”，
> 570行，正在调度中
>返回方法(* args，** kwargs)文件“/Users/macuser/Documents/UdactyCS253/HelloWorld/hello/main.py”，行
> 58，邮寄中
> user_month = self.valid_month(self.request.get('month'))TypeError:valid_month()恰好接受1个参数(给定2个)

Answer 1

快速而肮脏的解决方案是将self参数添加到valid_day，valid_month和valid_year函数:

class MainHandler(webapp2.RequestHandler):
    def valid_day(self, day):
        if day.isdigit() and int(day) in range(1, 32):
            return int(day)

    def valid_month(self, month):
        months = {'jan':'January', 'feb': 'February', 'mar':'March', 'apr':'April','may':'May',
                    'jun':'June', 'jul': 'July', 'aug': 'August', 'sep': 'September',
                    'oct': 'October', 'nov': 'November', 'dec': 'December'}
        m = month.lower()[:3]
        if m in months:
            return months[m]

    def valid_year(self, year):
        if year.isdigit() and int(year) in range(1900, 2021):
            return year

    ...

但是，甚至更好的方法是将 valid_day， valid_month和 valid_year移到 webapp2.RequestHandler之外，因为只有在与类相关且需要实例的情况下，才应定义类方法。在您的情况下，这些辅助函数仅是验证日期部分-不应将它们定义为 webapp2.RequestHandler类上的方法。然后，不使用 self.调用这些函数:

def valid_day(day):
    if day.isdigit() and int(day) in range(1, 32):
        return int(day)

def valid_month(month):
    months = {'jan':'January', 'feb': 'February', 'mar':'March', 'apr':'April','may':'May',
                'jun':'June', 'jul': 'July', 'aug': 'August', 'sep': 'September',
                'oct': 'October', 'nov': 'November', 'dec': 'December'}
    m = month.lower()[:3]
    if m in months:
        return months[m]

def valid_year(year):
    if year.isdigit() and int(year) in range(1900, 2021):
        return year

class MainHandler(webapp2.RequestHandler):
    def get(self):
        self.response.headers['Content-Type'] = 'text/html'
        self.response.out.write(form)

    def post(self):
        user_month = valid_month(self.request.get('month'))
        user_day = valid_day(self.request.get('day'))
        user_year = valid_year(self.request.get('year'))
        if not(user_month and user_day and user_year):
            self.response.out.write(form)
        else:
            self.response.out.write("You entered a valid date")