CODEWITHSUNDEEP
pythonbashpython-2.7
bardavid
bardavid

Reputation: 98

Equivalent of BASH_XTRACEFD redirection in Python

How can I emulate the following BASH script in Python2.7 ? (Redirection of commands that ran to some file):

exec 3> >(sed -e 's/^[+]* /[BASH] /' >> code_that_ran.tmp) 
export BASH_XTRACEFD=3
set -x

What I tried:

$ python -m trace -t prog.py

Problem is I need the trace to be run inside the script so I could redirect it to a file, perform some logic on it and not on the python execution line as said above

Thanks!:)

Upvotes: 1

Views: 120

Answers (1)

Kir Chou
Kir Chou

Reputation: 3080

According to your description:

I need the trace to be run inside the script so I could redirect it to a file

$ python -m trace -t prog.py

This will output trace result into stdout, I suppose you want to store that result into file. Below is an example based on the official documentation.

prog.py

def main():
    pass

if "__main__" == __name__:
    main()

trace_run.py

import sys
import trace
import imp

# create a Trace object, telling it what to ignore, and whether to do tracing or line-counting or both.
tracer = trace.Trace(
    ignoredirs=[sys.prefix, sys.exec_prefix],
    trace=0,
    count=1)

# load target program dynamically
target = imp.load_source(sys.argv[1], './'+sys.argv[1])

# run the main function of program using the given tracer
tracer.runfunc(target.main)

# make a report, placing output in the current directory
r = tracer.results()
r.write_results(show_missing=True, coverdir=".")

then simply run python trace_run.py prog.py

prog.cover

>>>>>> def main():
    1:     pass

>>>>>> if "__main__" == __name__:
>>>>>>     main()

Upvotes: 1

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