Hi! I'm using the Python interpreter (2.6.6, but I've found the same problem in 2.7.3) to log function calls when running a couple of Python programs. However, I'm not sure about the PyEval_SetProfile/PyEval_SetTrace functions, since the output I get from the interpreter contains more differences than line number registrations. According to the Python/C API documentation: "PyEval_SetTrace: Set the tracing function to func. This is similar to PyEval_SetProfile(), except the tracing function does receive line-number events." After looking in the CPython source code (the macro C_TRACE, found in Python/ceval.c), it seems like PyEval_SetProfile also reports C function calls (and exceptions and return values, but I haven't tried them), while PyEval_SetTrace doesn't, is this a bug in the interpreter or in the documentation? Regards, Sixten Hilborn