Add Python 3 modules, and more Python 2 modules.

Also, sort names alphabetically and add module docstrings.

python3/_stat.py

@@ -0,0 +1,30 @@
+"""Stub file for the '_stat' module."""
+# This is an autogenerated file. It serves as a starting point
+# for a more percise manual annotation of this module.
+# Feel free to edit the source below, but remove this header when you do.
+
+def S_IFMT(*args, **kwargs) -> long: pass
+
+def S_IMODE(*args, **kwargs) -> long: pass
+
+def S_ISBLK(*args, **kwargs) -> bool: pass
+
+def S_ISCHR(*args, **kwargs) -> bool: pass
+
+def S_ISDIR(*args, **kwargs) -> bool: pass
+
+def S_ISDOOR(*args, **kwargs) -> bool: pass
+
+def S_ISFIFO(*args, **kwargs) -> bool: pass
+
+def S_ISLNK(*args, **kwargs) -> bool: pass
+
+def S_ISPORT(*args, **kwargs) -> bool: pass
+
+def S_ISREG(*args, **kwargs) -> bool: pass
+
+def S_ISSOCK(*args, **kwargs) -> bool: pass
+
+def S_ISWHT(*args, **kwargs) -> bool: pass
+
+def filemode(*args, **kwargs) -> unicode: pass