def read_pickle(): userId_f = None businessId_f = None userId_c = None businessId_c = None if os.path.exists(userIdConversionPathStr): userId_f = file(userIdConversionPathStr, 'r+') userId_c = pickle.load(userId_f) else: userId_f = file(userIdConversionPathStr, 'w') userId_c = conversion.userIdConversion() if os.path.exists(businessIdConversionPathStr): businessId_f = file(businessIdConversionPathStr, 'r+') businessId_c = pickle.load(businessId_f) else: businessId_f = file(businessIdConversionPathStr, 'w') businessId_c = conversion.businessIdConversion() return userId_f, userId_c, businessId_f, businessId_c