[Level 1] How to trace the source code more efficient.

If you want to trace python call stack, you could get call sequence by using call_seq module. You could download call_seq from pypi website. https://pypi.python.org/pypi/call_seq/0.0.1 After you download it, you could prepare the python script like following. 
python from call_seq import CallSeq
trail = CallSeq()
trail.set_trace()
# the code you want to trace.
trail.unset_trace()
trail.dump_to_file('output.json')
After you create the output json file, then you could use browser module of call_seq to get visualization of call sequence. 
$ python -m call_seq.browser ./output.json

Wish this helps.

regards,
Stanley Huang

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