add (overwrite with) mypy stubs, if available

stdlib/2.7/shlex.pyi

@@ -0,0 +1,27 @@
+from typing import Optional, List, Any, IO
+
+def split(s: Optional[str], comments: bool = False, posix: bool = True) -> List[str]: ...
+
+class shlex:
+    def __init__(self, instream: IO[Any] = None, infile: IO[Any] = None, posix: bool = True) -> None: ...
+    def get_token(self) -> Optional[str]: ...
+    def push_token(self, _str: str) -> None: ...
+    def read_token(self) -> str: ...
+    def sourcehook(self, filename: str) -> None: ...
+    def push_source(self, stream: IO[Any], filename: str = None) -> None: ...
+    def pop_source(self) -> IO[Any]: ...
+    def error_leader(file: str = None, line: int = None) -> str: ...
+
+    commenters = ... # type: str
+    wordchars = ... # type: str
+    whitespace = ... # type: str
+    escape = ... # type: str
+    quotes = ... # type: str
+    escapedquotes = ... # type: str
+    whitespace_split = ... # type: bool
+    infile = ... # type: IO[Any]
+    source = ... # type: Optional[str]
+    debug = ... # type: int
+    lineno = ... # type: int
+    token = ... # type: Any
+    eof = ... # type: Optional[str]