added boolean dunder methods (#4124)

CHANGES/4102.misc

@@ -0,0 +1 @@
+web.Application and web.BaseRequest objects now has a boolean value of True

aiohttp/web_app.py

@@ -338,6 +338,9 @@ def __call__(self) -> 'Application':
     def __repr__(self) -> str:
         return "<Application 0x{:x}>".format(id(self))
 
+    def __bool__(self) -> bool:
+        return True
+
 
 class CleanupError(RuntimeError):
     @property

aiohttp/web_request.py

@@ -682,6 +682,9 @@ def __repr__(self) -> str:
     def __eq__(self, other: object) -> bool:
         return id(self) == id(other)
 
+    def __bool__(self) -> bool:
+        return True
+
     async def _prepare_hook(self, response: StreamResponse) -> None:
         return
 

tests/test_web_app.py

@@ -450,3 +450,8 @@ def test_forbid_changing_frozen_app() -> None:
     app.freeze()
     with pytest.raises(RuntimeError):
         app['key'] = 'value'
+
+
+def test_app_boolean() -> None:
+    app = web.Application()
+    assert app

tests/test_web_request.py

@@ -51,6 +51,8 @@ def test_base_ctor() -> None:
 
     assert '__dict__' not in dir(req)
 
+    assert req
+
 
 def test_ctor() -> None:
     req = make_mocked_request('GET', '/path/to?a=1&b=2')