parameters: (self, func, subst, widget)
docstring: Store FUNC, SUBST and WIDGET as members.
docstring_summary: Store FUNC, SUBST and WIDGET as members.
docstring_tokens: Store FUNC SUBST and WIDGET as members .
function: def __init__(self, func, subst, widget):
          """Store FUNC, SUBST and WIDGET as members."""
          self.func = func
          self.subst = subst
          self.widget = widget
function_tokens: def __init__ ( self , func , subst , widget ) : self . func = func self . subst = subst self . widget = widget