code: def sources(self):
          
  
          try:
              return self._sources
          except AttributeError:
              self._sources = find_sources(self)
  
          return self._sources
docs: Returns a dictionary of source methods found on this object,
          keyed on method name. Source methods are identified by
          (self, context) arguments on this object. For example:
  
          .. code-block:: python
  
              def f(self, context):
                      ...
  
          is a source method, but
  
          .. code-block:: python
  
              def f(self, ctx):
                  ...
  
              is not.