django 1.6 how does the form.as_p decide the textfield rows and and cols?

http://stackoverflow.com/questions/21481229/django-1-6-how-does-the-form-as-p-decide-the-textfield-rows-and-and-cols

I have read the form.as_p method source code, still don't know.

#models.py    class User(AbstractBaseUser):        description = models.TextField(max_length=200,blank=True,verbose_name=_('个人说明'))      #rest fields omitted...    #forms.py  class ProfileForm(forms.ModelForm):       class Meta:          model = User          fields = [ 'description', ]    #template.html,edit the profile  <form enctype="multipart/form-data" action="" method="post">{% csrf_token %}      {{form.as_p}}      <input type="submit" value="提交" />  </form>

this is the source code:

def _html_output(self, normal_row, error_row, row_ender, help_text_html, errors_on_separate_row):      "Helper function for outputting HTML. Used by as_table(), as_ul(), as_p()."      top_errors = self.non_field_errors() # Errors that should be displayed above all fields.      output, hidden_fields = [], []        for name, field in self.fields.items():          html_class_attr = ''          bf = self[name]          # Escape and cache in local variable.          bf_errors = self.error_class([conditional_escape(error) for error in bf.errors])          if bf.is_hidden:              if bf_errors:                  top_errors.extend(                      [_('(Hidden field %(name)s) %(error)s') % {'name': name, 'error': force_text(e)}                       for e in bf_errors])              hidden_fields.append(six.text_type(bf))          else:              # Create a 'class="..."' atribute if the row should have any              # CSS classes applied.              css_classes = bf.css_classes()              if css_classes:                  html_class_attr = ' class="%s"' % css_classes                if errors_on_separate_row and bf_errors:                  output.append(error_row % force_text(bf_errors))                if bf.label:                  label = conditional_escape(force_text(bf.label))                  label = bf.label_tag(label) or ''              else:                  label = ''                if field.help_text:                  help_text = help_text_html % force_text(field.help_text)              else:                  help_text = ''                output.append(normal_row % {                  'errors': force_text(bf_errors),                  'label': force_text(label),                  'field': six.text_type(bf),                  'help_text': help_text,                  'html_class_attr': html_class_attr              })

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