from pickle import load, dump
 
class Auto:
 
  def __init__(self):
    try:
      self.load()
    except:
      self.counter = 0
 
  def load(self):
    with open(self.__class__.__name__, 'rb') as f:
      self = load(f)
 
  def dump(self):
    with open(self.__class__.__name__, 'wb') as f:
      dump(self, f)
 
class Test(Auto):
  def increment(self):
    self.counter += 1
    print(self.counter)
    self.dump()
 
if __name__ == "__main__":
  t = Test()
  t.increment()

#!/usr/bin/env python3
from pickle import load, dump
from os.path import exists
 
class Auto:
  def __init__(self):
    if (exists(self.__class__.__name__)):
      self.load()
    else:
      self.start()
      self.dump()
 
  def start(self):
    pass
 
  def load(self):
    with open(self.__class__.__name__, 'rb') as f:
      self.__dict__ = load(f).__dict__
 
  def dump(self):
    with open(self.__class__.__name__, 'wb') as f:
      dump(self, f)
 
  def __enter__(self):
    if (exists(self.__class__.__name__)):
      self.load()
    return self
 
  def __exit__(self, extype, exvalue, traceback):
    if (None == extype == exvalue == traceback):
      self.dump()
    else:
      print('oh oh...')
 
 
class Test(Auto):
  def start(self):
    self.counter = 0
 
  def increment(self):
    self.counter += 1
    print(self.counter)
 
 
if __name__ == "__main__":
  with Test() as t:
    t.increment()