Use variable annotations everywhere (#2909)

stdlib/2/gzip.pyi

@@ -2,24 +2,24 @@ from typing import Any, IO, Text
 import io
 
 class GzipFile(io.BufferedIOBase):
-    myfileobj = ...  # type: Any
-    max_read_chunk = ...  # type: Any
-    mode = ...  # type: Any
-    extrabuf = ...  # type: Any
-    extrasize = ...  # type: Any
-    extrastart = ...  # type: Any
-    name = ...  # type: Any
-    min_readsize = ...  # type: Any
-    compress = ...  # type: Any
-    fileobj = ...  # type: Any
-    offset = ...  # type: Any
-    mtime = ...  # type: Any
+    myfileobj: Any
+    max_read_chunk: Any
+    mode: Any
+    extrabuf: Any
+    extrasize: Any
+    extrastart: Any
+    name: Any
+    min_readsize: Any
+    compress: Any
+    fileobj: Any
+    offset: Any
+    mtime: Any
     def __init__(self, filename: str = ..., mode: Text = ..., compresslevel: int = ...,
                  fileobj: IO[str] = ..., mtime: float = ...) -> None: ...
     @property
     def filename(self): ...
-    size = ...  # type: Any
-    crc = ...  # type: Any
+    size: Any
+    crc: Any
     def write(self, data): ...
     def read(self, size=...): ...
     @property