parameters: (self, frame, why, arg)
docstring: Handler for call events.
  
          Adds information about who called who to the self._callers dict.
docstring_summary: Handler for call events.
docstring_tokens: Handler for call events .
function: def globaltrace_trackcallers(self, frame, why, arg):
          """Handler for call events.
  
          Adds information about who called who to the self._callers dict.
          """
          if why == 'call':
              # XXX Should do a better job of identifying methods
              this_func = self.file_module_function_of(frame)
              parent_func = self.file_module_function_of(frame.f_back)
              self._callers[(parent_func, this_func)] = 1
function_tokens: def globaltrace_trackcallers ( self , frame , why , arg ) : if why == 'call' : # XXX Should do a better job of identifying methods this_func = self . file_module_function_of ( frame ) parent_func = self . file_module_function_of ( frame . f_back ) self . _callers [ ( parent_func , this_func ) ] = 1