parameters: (self)
docstring: Pushes a new layer for assignment tracking.
docstring_summary: Pushes a new layer for assignment tracking.
docstring_tokens: Pushes a new layer for assignment tracking .
function: def push_assign_tracking(self):
          """Pushes a new layer for assignment tracking."""
          self._assign_stack.append(set())
function_tokens: def push_assign_tracking ( self ) : self . _assign_stack . append ( set ( ) )