From 6fe7f45725dd0fc94fb3ce7ab3b3ff477b10401a Mon Sep 17 00:00:00 2001
From: David Lord <davidism@gmail.com>
Date: Thu, 13 May 2021 11:33:01 -0700
Subject: [PATCH] inform mypy that g has arbitrary attributes

---
 CHANGES.rst      |  2 ++
 src/flask/ctx.py | 22 ++++++++++++++++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/CHANGES.rst b/CHANGES.rst
index dbcc0667..2214dc49 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -10,6 +10,8 @@ Unreleased
     is deprecated. :pr:`4019`
 -   Mark top-level names as exported so type checking understands
     imports in user projects. :issue:`4024`
+-   Fix type annotation for ``g`` and inform mypy that it is a namespace
+    object that has arbitrary attributes. :issue:`4020`
 
 
 Version 2.0.0
diff --git a/src/flask/ctx.py b/src/flask/ctx.py
index 70de8cad..065edd5f 100644
--- a/src/flask/ctx.py
+++ b/src/flask/ctx.py
@@ -41,6 +41,24 @@ class _AppCtxGlobals:
         .. versionadded:: 0.10
     """
 
+    # Define attr methods to let mypy know this is a namespace object
+    # that has arbitrary attributes.
+
+    def __getattr__(self, name: str) -> t.Any:
+        try:
+            return self.__dict__[name]
+        except KeyError:
+            raise AttributeError(name) from None
+
+    def __setattr__(self, name: str, value: t.Any) -> None:
+        self.__dict__[name] = value
+
+    def __delattr__(self, name: str) -> None:
+        try:
+            del self.__dict__[name]
+        except KeyError:
+            raise AttributeError(name) from None
+
     def get(self, name: str, default: t.Optional[t.Any] = None) -> t.Any:
         """Get an attribute by name, or a default value. Like
         :meth:`dict.get`.
@@ -78,10 +96,10 @@ class _AppCtxGlobals:
         """
         return self.__dict__.setdefault(name, default)
 
-    def __contains__(self, item: t.Any) -> bool:
+    def __contains__(self, item: str) -> bool:
         return item in self.__dict__
 
-    def __iter__(self) -> t.Iterator:
+    def __iter__(self) -> t.Iterator[str]:
         return iter(self.__dict__)
 
     def __repr__(self) -> str: