file - How can I set an instance variable as a fileHandle in python? -

i want define class attaches filehandle class. example, can define class instance variable file handler object, not safe when object dereferenced.

class customloggingclass(object):     def __init__(self, *args, **kwargs):         self.filehandle = open("logfile.json", "w+") 

how implement in safe way logfile.json closed properly?

probably simplest thing create helper context manager function thecontextlib.contextmanagerdecorator , use in conjunction awith statement. example:

class customloggingclass(object):     def __init__(self, *args, **kwargs):         self.filehandle = open("logfile.json", "w+")      def close(self):         self.filehandle.close()  import contextlib  @contextlib.contextmanager def cm_logger():     logger = customloggingclass()     yield logger     logger.close()  if __name__ == '__main__':     cm_logger logger:         # stuff logger, customloggingclass instance         pass 

the with statement , context managers discussed in pep 343.