add (overwrite with) mypy stubs, if available

stdlib/3/shlex.pyi

@@ -0,0 +1,36 @@
+# Stubs for shlex
+
+# Based on http://docs.python.org/3.2/library/shlex.html
+
+from typing import List, Tuple, Any, TextIO
+
+def split(s: str, comments: bool = False,
+          posix: bool = True) -> List[str]: ...
+
+class shlex:
+    commenters = ''
+    wordchars = ''
+    whitespace = ''
+    escape = ''
+    quotes = ''
+    escapedquotes = ''
+    whitespace_split = ''
+    infile = ''
+    instream = ...  # type: TextIO
+    source = ''
+    debug = 0
+    lineno = 0
+    token = ''
+    eof = ''
+
+    def __init__(self, instream=None, infile=None,
+                 posix: bool = False) -> None: ...
+    def get_token(self) -> str: ...
+    def push_token(self, tok: str) -> None: ...
+    def read_token(self) -> str: ...
+    def sourcehook(self, filename: str) -> Tuple[str, TextIO]: ...
+    # TODO argument types
+    def push_source(self, newstream: Any, newfile: Any = None) -> None: ...
+    def pop_source(self) -> None: ...
+    def error_leader(self, infile: str = None,
+                     lineno: int = None) -> None: ...