Use variable annotations everywhere (#2909)

stdlib/2and3/zipfile.pyi

@@ -24,11 +24,11 @@ error = BadZipfile
 class LargeZipFile(Exception): ...
 
 class ZipFile:
-    debug = ...  # type: int
-    comment = ...  # type: bytes
-    filelist = ...  # type: List[ZipInfo]
-    fp = ...  # type: IO[bytes]
-    NameToInfo = ...  # type: Dict[Text, ZipInfo]
+    debug: int
+    comment: bytes
+    filelist: List[ZipInfo]
+    fp: IO[bytes]
+    NameToInfo: Dict[Text, ZipInfo]
     def __init__(self, file: Union[_Path, IO[bytes]], mode: Text = ..., compression: int = ...,
                  allowZip64: bool = ...) -> None: ...
     def __enter__(self) -> ZipFile: ...
@@ -72,23 +72,23 @@ class PyZipFile(ZipFile):
                     pathname: Text, basename: Text = ...) -> None: ...
 
 class ZipInfo:
-    filename = ...  # type: Text
-    date_time = ...  # type: _DT
-    compress_type = ...  # type: int
-    comment = ...  # type: bytes
-    extra = ...  # type: bytes
-    create_system = ...  # type: int
-    create_version = ...  # type: int
-    extract_version = ...  # type: int
-    reserved = ...  # type: int
-    flag_bits = ...  # type: int
-    volume = ...  # type: int
-    internal_attr = ...  # type: int
-    external_attr = ...  # type: int
-    header_offset = ...  # type: int
-    CRC = ...  # type: int
-    compress_size = ...  # type: int
-    file_size = ...  # type: int
+    filename: Text
+    date_time: _DT
+    compress_type: int
+    comment: bytes
+    extra: bytes
+    create_system: int
+    create_version: int
+    extract_version: int
+    reserved: int
+    flag_bits: int
+    volume: int
+    internal_attr: int
+    external_attr: int
+    header_offset: int
+    CRC: int
+    compress_size: int
+    file_size: int
     def __init__(self, filename: Optional[Text] = ...,
                  date_time: Optional[_DT] = ...) -> None: ...
     if sys.version_info >= (3, 6):
@@ -98,8 +98,8 @@ class ZipInfo:
 
 def is_zipfile(filename: Union[_Path, IO[bytes]]) -> bool: ...
 
-ZIP_STORED = ...  # type: int
-ZIP_DEFLATED = ...  # type: int
+ZIP_STORED: int
+ZIP_DEFLATED: int
 if sys.version_info >= (3, 3):
-    ZIP_BZIP2 = ...  # type: int
-    ZIP_LZMA = ...  # type: int
+    ZIP_BZIP2: int
+    ZIP_LZMA: int