Add Python 3 modules, and more Python 2 modules.

Also, sort names alphabetically and add module docstrings.

python3/_heapq.py

@@ -0,0 +1,25 @@
+"""Stub file for the '_heapq' 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 heapify(*args, **kwargs) -> NoneType:
+    raise TypeError()
+
+def heappop(*args, **kwargs) -> object:
+    raise TypeError()
+    raise IndexError()
+
+def heappush(*args, **kwargs) -> NoneType:
+    raise TypeError()
+
+def heappushpop(*args, **kwargs) -> object:
+    raise TypeError()
+
+def heapreplace(*args, **kwargs) -> object:
+    raise TypeError()
+    raise IndexError()
+
+def nlargest(a: int, b) -> List[object]: pass
+
+def nsmallest(a: int, b) -> List[object]: pass