code: def list_functions(mod_name):
      
      mod = sys.modules[mod_name]
      return [func.__name__ for func in mod.__dict__.values()
              if is_mod_function(mod, func)]
docs: Lists all functions declared in a module.
  
      http://stackoverflow.com/a/1107150/3004221
  
      Args:
          mod_name: the module name
      Returns:
          A list of functions declared in that module.