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Remove Python 3.7 workaround for PicklePersistence #3740

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Merged
Bibo-Joshi merged 5 commits into from
Jun 9, 2023
Merged

Remove Python 3.7 workaround for PicklePersistence #3740

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1900882
Remove py 3.7 workaround in picklepersistence
harshil21 Jun 3, 2023
e3858ed
Merge branch 'drop-py-37' into pp-workaround
harshil21 Jun 3, 2023
0312c03
Merge branch 'drop-py-37' into pp-workaround
harshil21 Jun 3, 2023
17bb527
Review: add back _custom_reduction and docstring
harshil21 Jun 7, 2023
70f1f93
Merge branch 'drop-py-37' into pp-workaround
harshil21 Jun 7, 2023
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13 changes: 4 additions & 9 deletions telegram/ext/_picklepersistence.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,11 +17,9 @@
# You should have received a copy of the GNU Lesser Public License
# along with this program. If not, see [http://www.gnu.org/licenses/].
"""This module contains the PicklePersistence class."""
import copyreg
import pickle
from copy import deepcopy
from pathlib import Path
from sys import version_info as py_ver
from typing import Any, Callable, Dict, Optional, Set, Tuple, Type, TypeVar, Union, cast, overload

from telegram import Bot, TelegramObject
Expand Down Expand Up @@ -74,18 +72,15 @@ class _BotPickler(pickle.Pickler):

def __init__(self, bot: Bot, *args: Any, **kwargs: Any):
self._bot = bot
if py_ver < (3, 8): # self.reducer_override is used above this version
# Here we define a private dispatch_table, because we want to preserve the bot
# attribute of objects so persistent_id works as intended. Otherwise, the bot attribute
# is deleted in __getstate__, which is used during regular pickling (via pickle.dumps)
self.dispatch_table = copyreg.dispatch_table.copy()
for obj in _all_subclasses(TelegramObject):
self.dispatch_table[obj] = _custom_reduction
super().__init__(*args, **kwargs)

def reducer_override( # skipcq: PYL-R0201
self, obj: TelegramObj
) -> Tuple[Callable, Tuple[Type[TelegramObj], dict]]:
"""
This method is used for pickling. The bot attribute is preserved so
_BotPickler().persistent_id works as intended.
"""
if not isinstance(obj, TelegramObject):
return NotImplemented

Expand Down