old_contents: from django import forms
  
  def generate_form(model):
      """
      Generate a form from a model.
  
      Arguments:
      model -- A Django model.
      """
      _model = model
      class Form(forms.ModelForm):
          class Meta:
              model = _model
      return Form
  
  def get_content_type(format):
      """
      Determine the content type from a format.
  
      Arguments:
      format -- A string describing a format.
      """
      formats = [
          ('html', 'text/html'),
          ('txt', 'text/plain'),
          ('json', 'application/json'),
          ('xml', 'text/xml'),
      ]
  
      for f in formats:
          if f[0] == format:
              return f[1]
  
      raise ValueError('Content type not known for format "%s"' % format)
  
  def get_format(content_type):
      """
      Determine the format from a content type.
  
      Arguments:
      format -- A string describing a format.
      """
      content_types = [
          ('text/html', 'html'),
          ('application/xhtml+xml', 'html'),
          ('text/plain', 'txt'),
          ('application/json', 'json'),
          ('text/xml', 'xml'),
          ('application/xml', 'xml')
      ]
  
      for s in content_types:
          if s[0] == content_type:
              return s[1]
  
      raise ValueError('Content type not known for format "%s"' % format)
  
  def parse_http_accept_header(header):
      """
      Return a list of content types listed in the HTTP Accept header
      ordered by quality.
  
      Arguments:
      header -- A string describing the contents of the HTTP Accept header.
      """
      components = header.split(',')
  
      l = []
      for component in components:
          if ';' in component:
              subcomponents = component.split(';')
              l.append(
                  (
                      subcomponents[0], # eg. 'text/html'
                      subcomponents[1][2:] # eg. 'q=0.9'
                  )
              )
          else:
              l.append((component, '1'))
  
      l.sort(
          key = lambda i: i[1],
          reverse = True
      )
  
      content_types = []
      for i in l:
          content_types.append(i[0])
  
      return content_types
  
new_contents: from django import forms
  
  def generate_form(model):
      """
      Generate a form from a model.
  
      Arguments:
      model -- A Django model.
      """
      _model = model
      class Form(forms.ModelForm):
          class Meta:
              model = _model
      return Form
  
  def get_content_type(format):
      """
      Determine the content type from a format.
  
      Arguments:
      format -- A string describing a format.
      """
      formats = [
          ('html', 'text/html'),
          ('txt', 'text/plain'),
          ('json', 'application/json'),
          ('xml', 'text/xml'),
      ]
  
      for f in formats:
          if f[0] == format:
              return f[1]
  
      raise ValueError('Content type not known for format "%s"' % format)
  
  def get_format(content_type):
      """
      Determine the format from a content type.
  
      Arguments:
      format -- A string describing a format.
      """
      content_types = [
          ('text/html', 'html'),
          ('application/xhtml+xml', 'html'),
          ('text/plain', 'txt'),
          ('application/json', 'json'),
          ('text/xml', 'xml'),
          ('application/xml', 'xml')
      ]
  
      for s in content_types:
          if s[0] == content_type:
              return s[1]
  
      raise ValueError('Format not known for content type "%s"' % content_type)
  
  def parse_http_accept_header(header):
      """
      Return a list of content types listed in the HTTP Accept header
      ordered by quality.
  
      Arguments:
      header -- A string describing the contents of the HTTP Accept header.
      """
      components = header.split(',')
  
      l = []
      for component in components:
          if ';' in component:
              subcomponents = component.split(';')
              l.append(
                  (
                      subcomponents[0], # eg. 'text/html'
                      subcomponents[1][2:] # eg. 'q=0.9'
                  )
              )
          else:
              l.append((component, '1'))
  
      l.sort(
          key = lambda i: i[1],
          reverse = True
      )
  
      content_types = []
      for i in l:
          content_types.append(i[0])
  
      return content_types
  
subject: Fix typo