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Say you have some python application such as [[Reposurgeon]] that you need to understand better. You can attach <code>strace</code> to the <code><abbrev title="process id">pid</abbrev></code> of the running application to see the underlying system calls being made.
<source lang="bash">
sudo strace -f -s128 -e trace=open -p$(ps -o lwp= -LC python2 | tail -1)
# -f follow child processes
# -s string width
# -e set which calls you want to see. Using trace=open is like sudo lsof -ad3-999 -c python2
</source>