Django Internal Server Error (takes exactly 1 argument (2 given)) -

i receive internal server error "typeerror: valid_month() takes 1 argument (2 given)" when try , submit django form. looks me i'm passing 1 argument valid_month(), not two. me understand i'm doing wrong here? i'm using google app engine launcher test this.

import webapp2  form=""" <form method="post">     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> """ 

forms.py

class mainhandler(webapp2.requesthandler):     def valid_day(day):         if day.isdigit() , 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() , 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 , user_day , user_year):             self.response.out.write(form)         else:             self.response.out.write("you entered valid date")     app = webapp2.wsgiapplication([('/', mainhandler)], debug=true) 

i receive following traceback when submitting form:

> traceback (most recent call last):   file > "/applications/googleappenginelauncher.app/contents/resources/googleappengine-default.bundle/contents/resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", > line 1535, in __call__ >     rv = self.handle_exception(request, response, e)   file "/applications/googleappenginelauncher.app/contents/resources/googleappengine-default.bundle/contents/resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", > line 1529, in __call__ >     rv = self.router.dispatch(request, response)   file "/applications/googleappenginelauncher.app/contents/resources/googleappengine-default.bundle/contents/resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", > line 1278, in default_dispatcher >     return route.handler_adapter(request, response)   file "/applications/googleappenginelauncher.app/contents/resources/googleappengine-default.bundle/contents/resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", > line 1102, in __call__ >     return handler.dispatch()   file "/applications/googleappenginelauncher.app/contents/resources/googleappengine-default.bundle/contents/resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", > line 572, in dispatch >     return self.handle_exception(e, self.app.debug)   file "/applications/googleappenginelauncher.app/contents/resources/googleappengine-default.bundle/contents/resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", > line 570, in dispatch >     return method(*args, **kwargs)   file "/users/macuser/documents/udactycs253/helloworld/hello/main.py", line > 58, in post >     user_month = self.valid_month(self.request.get('month')) typeerror: valid_month() takes 1 argument (2 given)

quick , dirty solution add self argument valid_day, valid_month , valid_year functions:

class mainhandler(webapp2.requesthandler):     def valid_day(self, day):         if day.isdigit() , 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() , int(year) in range(1900, 2021):             return year      ... 

but, better move valid_day, valid_month , valid_year outside of webapp2.requesthandler because, should define class methods if relevant class , need instance. in case, these helper functions validating date parts - should not defined methods on webapp2.requesthandler class. then, call these functions without self.:

def valid_day(day):     if day.isdigit() , 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() , 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 , user_day , user_year):             self.response.out.write(form)         else:             self.response.out.write("you entered valid date")