code: def set(self, name, value, force=False):
          
          for func in ("checkbox", "radio", "input", "textarea", "select"):
              try:
                  getattr(self, "set_" + func)({name: value})
                  return
              except InvalidFormMethod:
                  pass
          if force:
              self.new_control('text', name, value=value)
              return
          raise LinkNotFoundError("No valid element named " + name)
docs: Set a form element identified by ``name`` to a specified ``value``.
          The type of element (input, textarea, select, ...) does not
          need to be given; it is inferred by the following methods:
          :func:`~Form.set_checkbox`,
          :func:`~Form.set_radio`,
          :func:`~Form.set_input`,
          :func:`~Form.set_textarea`,
          :func:`~Form.set_select`.
          If none of these methods find a matching element, then if ``force``
          is True, a new element (``<input type="text" ...>``) will be
          added using :func:`~Form.new_control`.
  
          Example: filling-in a login/password form with EULA checkbox
  
          .. code-block:: python
  
              form.set("login", username)
              form.set("password", password)
              form.set("eula-checkbox", True)
  
          Example: uploading a file through a ``<input type="file"
          name="tagname">`` field (provide the path to the local file,
          and its content will be uploaded):
  
          .. code-block:: python
  
              form.set("tagname") = path_to_local_file