A few useful definitions if you're using gdb. Copy to ~/.gdbinit to
pull it in automatically.
diff --git a/Misc/gdbinit b/Misc/gdbinit
new file mode 100644
index 0000000..a164f42
--- /dev/null
+++ b/Misc/gdbinit
@@ -0,0 +1,27 @@
+# -*- ksh -*-
+#
+# If you use the GNU debugger gdb to debug the Python C runtime, you
+# might find some of the following commands useful. Copy this to your
+# ~/.gdbinit file and it'll get loaded into gdb automatically when you
+# start it up. Then, at the gdb prompt you can do things like:
+#
+# (gdb) pyo apyobjectptr
+# <module 'foobar' (built-in)>
+# refcounts: 1
+# address : 84a7a2c
+# $1 = void
+# (gdb)
+
+# Prints a representation of the object to stderr, along with the
+# number of reference counts it current has and the hex address the
+# object is allocated at. The argument must be a PyObject*
+define pyo
+print PyObject_Dump($arg0)
+end
+
+# Prints a representation of the object to stderr, along with the
+# number of reference counts it current has and the hex address the
+# object is allocated at. The argument must be a PyGC_Head*
+define pyg
+print PyGC_Dump($arg0)
+end