add (overwrite with) mypy stubs, if available

stdlib/3/zipfile.pyi

@@ -0,0 +1,29 @@
+# TODO these are incomplete
+
+from typing import List, Tuple, BinaryIO, Union
+
+ZIP_STORED = 0
+ZIP_DEFLATED = 0
+
+def is_zipfile(filename: Union[str, BinaryIO]) -> bool: ...
+
+class ZipInfo:
+    filename = ''
+    date_time = ... # type: Tuple[int, int, int, int, int, int]
+    compressed_size = 0
+    file_size = 0
+
+class ZipFile:
+    def __init__(self, file: Union[str, BinaryIO], mode: str = 'r',
+                 compression: int = ZIP_STORED,
+                 allowZip64: bool = False) -> None: ...
+    def close(self) -> None: ...
+    def getinfo(name: str) -> ZipInfo: ...
+    def infolist(self) -> List[ZipInfo]: ...
+    def namelist(self) -> List[str]: ...
+    def read(self, name: Union[str, ZipInfo], pwd: str = None) -> bytes: ...
+    def write(self, filename: str, arcname: str = None,
+              compress_type: int = None) -> None: ...
+
+    def __enter__(self) -> 'ZipFile': ...
+    def __exit__(self, type, value, traceback) -> bool: ...