Remove and dissallow unused type ignores (#2470)

* Remove and dissallow unused type ignores

* add pragmas

* fix ignore

httpx/_config.py

@@ -1,5 +1,6 @@
 import os
 import ssl
+import sys
 import typing
 from pathlib import Path
 
@@ -125,15 +126,16 @@ def load_ssl_context_verify(self) -> ssl.SSLContext:
 
         # Signal to server support for PHA in TLS 1.3. Raises an
         # AttributeError if only read-only access is implemented.
-        try:
-            context.post_handshake_auth = True  # type: ignore
-        except AttributeError:  # pragma: no cover
-            pass
+        if sys.version_info >= (3, 8):  # pragma: no cover
+            try:
+                context.post_handshake_auth = True
+            except AttributeError:  # pragma: no cover
+                pass
 
         # Disable using 'commonName' for SSLContext.check_hostname
         # when the 'subjectAltName' extension isn't available.
         try:
-            context.hostname_checks_common_name = False  # type: ignore
+            context.hostname_checks_common_name = False
         except AttributeError:  # pragma: no cover
             pass
 
@@ -162,10 +164,10 @@ def _create_default_ssl_context(self) -> ssl.SSLContext:
             alpn_idents = ["http/1.1", "h2"] if self.http2 else ["http/1.1"]
             context.set_alpn_protocols(alpn_idents)
 
-        if hasattr(context, "keylog_filename"):  # pragma: no cover (Available in 3.8+)
+        if sys.version_info >= (3, 8):  # pragma: no cover
             keylogfile = os.environ.get("SSLKEYLOGFILE")
             if keylogfile and self.trust_env:
-                context.keylog_filename = keylogfile  # type: ignore
+                context.keylog_filename = keylogfile
 
         return context
 

httpx/_content.py

@@ -189,7 +189,7 @@ def encode_request(
     Handles encoding the given `content`, `data`, `files`, and `json`,
     returning a two-tuple of (<headers>, <stream>).
     """
-    if data is not None and not isinstance(data, Mapping):  # type: ignore
+    if data is not None and not isinstance(data, Mapping):
         # We prefer to separate `content=<bytes|str|byte iterator|bytes aiterator>`
         # for raw request content, and `data=<form data>` for url encoded or
         # multipart form content.

httpx/_status_codes.py

@@ -22,10 +22,10 @@ class codes(IntEnum):
     """
 
     def __new__(cls, value: int, phrase: str = "") -> "codes":
-        obj = int.__new__(cls, value)  # type: ignore
+        obj = int.__new__(cls, value)
         obj._value_ = value
 
-        obj.phrase = phrase  # type: ignore
+        obj.phrase = phrase  # type: ignore[attr-defined]
         return obj
 
     def __str__(self) -> str:

httpx/_transports/mock.py

@@ -29,6 +29,6 @@ async def handle_async_request(
 
         # https://simonwillison.net/2020/Sep/2/await-me-maybe/
         if asyncio.iscoroutine(response):
-            response = await response  # type: ignore[func-returns-value,assignment]
+            response = await response
 
         return response

setup.cfg

@@ -8,6 +8,7 @@ disallow_any_generics = True
 ignore_missing_imports = True
 no_implicit_optional = True
 show_error_codes = True
+warn_unused_ignores = True
 warn_unused_configs = True
 disallow_subclassing_any = True
 check_untyped_defs = True

tests/test_config.py

@@ -178,25 +178,26 @@ def test_timeout_repr():
 )
 @pytest.mark.skipif(sys.version_info < (3, 8), reason="requires python3.8 or higher")
 def test_ssl_config_support_for_keylog_file(tmpdir, monkeypatch):  # pragma: no cover
-    with monkeypatch.context() as m:
-        m.delenv("SSLKEYLOGFILE", raising=False)
+    if sys.version_info > (3, 8):
+        with monkeypatch.context() as m:
+            m.delenv("SSLKEYLOGFILE", raising=False)
 
-        context = httpx.create_ssl_context(trust_env=True)
+            context = httpx.create_ssl_context(trust_env=True)
 
-        assert context.keylog_filename is None  # type: ignore
+            assert context.keylog_filename is None
 
-    filename = str(tmpdir.join("test.log"))
+        filename = str(tmpdir.join("test.log"))
 
-    with monkeypatch.context() as m:
-        m.setenv("SSLKEYLOGFILE", filename)
+        with monkeypatch.context() as m:
+            m.setenv("SSLKEYLOGFILE", filename)
 
-        context = httpx.create_ssl_context(trust_env=True)
+            context = httpx.create_ssl_context(trust_env=True)
 
-        assert context.keylog_filename == filename  # type: ignore
+            assert context.keylog_filename == filename
 
-        context = httpx.create_ssl_context(trust_env=False)
+            context = httpx.create_ssl_context(trust_env=False)
 
-        assert context.keylog_filename is None  # type: ignore
+            assert context.keylog_filename is None
 
 
 def test_proxy_from_url():

tests/test_content.py

@@ -105,7 +105,7 @@ def hello_world():
 
     # Support 'data' for compat with requests.
     with pytest.warns(DeprecationWarning):
-        headers, stream = encode_request(data=hello_world())  # type: ignore
+        headers, stream = encode_request(data=hello_world())
     assert isinstance(stream, typing.Iterable)
     assert not isinstance(stream, typing.AsyncIterable)
 
@@ -135,7 +135,7 @@ async def hello_world():
 
     # Support 'data' for compat with requests.
     with pytest.warns(DeprecationWarning):
-        headers, stream = encode_request(data=hello_world())  # type: ignore
+        headers, stream = encode_request(data=hello_world())
     assert not isinstance(stream, typing.Iterable)
     assert isinstance(stream, typing.AsyncIterable)