code: def form(self):
          
          if self._form is None:
              # Make sure FieldStorage always parses the form content,
              # and never the query string.
              environ = self.environ.copy()
              environ['QUERY_STRING'] = ''
              environ['REQUEST_METHOD'] = 'POST'
              fs = cgi.FieldStorage(
                  fp=self.input,
                  environ=environ,
                  keep_blank_values=True)
              # File upload field handling copied from WebOb
              fields = []
              for f in fs.list or []:
                  if f.filename:
                      f.filename = f.filename.decode('utf-8')
                      fields.append((f.name.decode('utf-8'), f))
                  else:
                      fields.append(
                          (f.name.decode('utf-8'), f.value.decode('utf-8'))
                      )
              self._form = QueryDict(fields)
          return self._form
docs: Reads the request body and tries to parse it as a web form.
  
          Parsing is done using the stdlib's `cgi.FieldStorage` class
          which supports multipart forms (file uploads).
          Returns a `QueryDict` object holding the form fields. Uploaded files
          are represented as form fields with a 'filename' attribute.