The following are examples of py_profile.d.

This samples stack traces for the process specified. This stack trace will 
cross the Python engine and system libraries, and insert translations for 
Python stack frames where appropriate.   Here you can see it running on 
Code/Python/func_slow.py

# py_profile.d -c ./func_slow.py
Sampling 10-level stacks at 1001 Hertz... Hit Ctrl-C to end.
Function A
Function B
Function C
Top 25 most frequently sampled stacks,


              libpython2.4.so.1.0`PyEval_EvalFrame+0x266
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               11

              libpython2.4.so.1.0`PyEval_EvalFrame+0x278
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               11

              libpython2.4.so.1.0`PyEval_EvalFrame+0x278a
                [ ./func_slow.py:10 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
              libpython2.4.so.1.0`PyEval_EvalCodeEx+0x732
              libpython2.4.so.1.0`PyEval_EvalCode+0x22
              libpython2.4.so.1.0`run_node+0x35
               11

              libpython2.4.so.1.0`PyEval_EvalFrame+0x205
                [ ./func_slow.py:18 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
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              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
              libpython2.4.so.1.0`PyEval_EvalCodeEx+0x732
              libpython2.4.so.1.0`PyEval_EvalCode+0x22
              libpython2.4.so.1.0`run_node+0x35
              libpython2.4.so.1.0`run_err_node+0x1f
              libpython2.4.so.1.0`PyRun_FileExFlags+0x5e
              libpython2.4.so.1.0`PyRun_SimpleFileExFlags+0x12f
               12

              libpython2.4.so.1.0`PyEval_EvalFrame+0x1fe
                [ ./func_slow.py:10 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
              libpython2.4.so.1.0`PyEval_EvalCodeEx+0x732
              libpython2.4.so.1.0`PyEval_EvalCode+0x22
              libpython2.4.so.1.0`run_node+0x35
               13

              libpython2.4.so.1.0`PyEval_EvalFrame+0x35d
                [ ./func_slow.py:10 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
              libpython2.4.so.1.0`PyEval_EvalCodeEx+0x732
              libpython2.4.so.1.0`PyEval_EvalCode+0x22
              libpython2.4.so.1.0`run_node+0x35
               13

              libpython2.4.so.1.0`PyEval_EvalFrame+0x1f5
                [ ./func_slow.py:10 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
              libpython2.4.so.1.0`PyEval_EvalCodeEx+0x732
              libpython2.4.so.1.0`PyEval_EvalCode+0x22
              libpython2.4.so.1.0`run_node+0x35
               14

              libpython2.4.so.1.0`PyEval_EvalFrame+0x149
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               14

              libpython2.4.so.1.0`PyEval_EvalFrame+0x5aa
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               14

              libpython2.4.so.1.0`PyEval_EvalFrame+0x58f
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               15

              libpython2.4.so.1.0`PyEval_EvalFrame+0x58f
                [ ./func_slow.py:10 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
              libpython2.4.so.1.0`PyEval_EvalCodeEx+0x732
              libpython2.4.so.1.0`PyEval_EvalCode+0x22
              libpython2.4.so.1.0`run_node+0x35
               15

              libpython2.4.so.1.0`PyEval_EvalFrame+0x254
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
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                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               17

              libpython2.4.so.1.0`PyEval_EvalFrame+0x286
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               17

              libpython2.4.so.1.0`PyEval_EvalFrame+0x2fbf
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               17

              libpython2.4.so.1.0`PyEval_EvalFrame+0x35d
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               18

              libc.so.1`ioctl+0x7
              libpython2.4.so.1.0`_init+0x25
              ld.so.1`call_init+0xff
              ld.so.1`setup+0xf93
              ld.so.1`_setup+0x310
              ld.so.1`_rt_boot+0x56
              0x8047e5c
               19

              libpython2.4.so.1.0`PyEval_EvalFrame+0x5a4
                [ ./func_slow.py:18 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
              libpython2.4.so.1.0`PyEval_EvalCodeEx+0x732
              libpython2.4.so.1.0`PyEval_EvalCode+0x22
              libpython2.4.so.1.0`run_node+0x35
              libpython2.4.so.1.0`run_err_node+0x1f
              libpython2.4.so.1.0`PyRun_FileExFlags+0x5e
              libpython2.4.so.1.0`PyRun_SimpleFileExFlags+0x12f
               20

              libpython2.4.so.1.0`PyEval_EvalFrame+0x5ba
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               20

              libpython2.4.so.1.0`PyEval_EvalFrame+0x583
                [ ./func_slow.py:10 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
              libpython2.4.so.1.0`PyEval_EvalCodeEx+0x732
              libpython2.4.so.1.0`PyEval_EvalCode+0x22
              libpython2.4.so.1.0`run_node+0x35
               22

              libpython2.4.so.1.0`PyEval_EvalFrame+0x5a4
                [ ./func_slow.py:10 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
              libpython2.4.so.1.0`PyEval_EvalCodeEx+0x732
              libpython2.4.so.1.0`PyEval_EvalCode+0x22
              libpython2.4.so.1.0`run_node+0x35
               22

              libpython2.4.so.1.0`PyEval_EvalFrame+0x278a
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               24

              libpython2.4.so.1.0`PyEval_EvalFrame+0x205
                [ ./func_slow.py:10 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
              libpython2.4.so.1.0`PyEval_EvalCodeEx+0x732
              libpython2.4.so.1.0`PyEval_EvalCode+0x22
              libpython2.4.so.1.0`run_node+0x35
               25

              libpython2.4.so.1.0`PyEval_EvalFrame+0x583
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               35

              libpython2.4.so.1.0`PyEval_EvalFrame+0x5a4
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               47

              libpython2.4.so.1.0`PyEval_EvalFrame+0x205
                [ ./func_slow.py:3 (func_c) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:16 (func_b) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:24 (func_a) ]
              libpython2.4.so.1.0`fast_function+0xa8
              libpython2.4.so.1.0`call_function+0xda
              libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
                [ ./func_slow.py:26 (?) ]
               50

 The lines in square brackets are the native Python frames, the rest
 are the Python engine.