Made _UndefinedType as a Singleton class. (#402)

Co-authored-by: Alexander Maximenyuk <alex.maximenyuk@ccsteam.ru>
ExpressApp · Jun 22, 2023 · 06af540 · 06af540
1 parent dc234fb
commit 06af540
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Showing 3 changed files with 72 additions and 65 deletions.
diff --git a/poetry.lock b/poetry.lock
diff --git a/pybotx/missing.py b/pybotx/missing.py
@@ -1,9 +1,16 @@
-from typing import Literal, TypeVar, Union
+from typing import Any, List, Literal, TypeVar, Union
 
 
 class _UndefinedType:
     """For fields that can be skipped."""
 
+    _instances: List["_UndefinedType"] = []
+
+    def __new__(cls, *args: Any) -> "_UndefinedType":
+        if not cls._instances:
+            cls._instances.append(super().__new__(cls, *args))
+        return cls._instances[-1]
+
     def __bool__(self) -> Literal[False]:
         return False
 

diff --git a/pyproject.toml b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pybotx"
-version = "0.55.5"
+version = "0.55.6"
 description = "A python library for interacting with eXpress BotX API"
 authors = [
     "Sidnev Nikolay <nsidnev@ccsteam.ru>",