[issue14803] Add -C option to run code at Python startup
Antoine Pitrou pit...@free.fr added the comment: It would be nice to have a comparison of the available alternatives. It's not obvious that asking people to type some -C ... boilerplate to get code coverage is very user-friendly. Or am I misunderstanding the request? -- nosy: +pitrou ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14803 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14803] Add -C option to run code at Python startup
Ned Batchelder n...@nedbatchelder.com added the comment: The difficulty that coverage faces is not measuring python programs started from the command line like this, you can use coverage run myprog.py or python -m coverage run myprog.py. The difficulty is when there are subprocesses running python programs. Read http://nedbatchelder.com/code/coverage/subprocess.html for the two current hacks used to invoke coverage on subprocesses. If -C is implemented, it should have a PYTHONRUNFIRST environment variable (or the like) to make these hacks unnecessary. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14803 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14803] Add -C option to run code at Python startup
New submission from Nick Coghlan ncogh...@gmail.com: Reading http://nedbatchelder.com/code/coverage/subprocess.html, it occurred to me that there are various tracing and profiling operations that could be cleanly handled with significantly less work on the part of the tracing/profiling tool authors if the interpreter supported a -C operation that was like the existing -c option, but *didn't* terminate the options list. The interpreter would invoke such commands after the interpreter is fully initialised, but before it begins the processing to find and execute __main__. Then, to use subprocess coverage with coverage.py as an example, you could just run a command like: python -C 'import coverage; coverage.process_startup()' worker.py Other things you could usefully do in such an invocation is reconfigure sys.std(in|out|err) to match the settings used on the invoking side (e.g. to ensure Unicode data is tunnelled correctly), configure the logging module with a custom configuration, configure the warnings module programmatically, enable a memory profiler, etc. Providing a function that could be called from -C and then uses an atexit() handler to do any necessary post-processing may be significantly simpler than trying to use runpy.run_(path|module) to achieve a similar effect. -- messages: 160597 nosy: ncoghlan priority: normal severity: normal status: open title: Add -C option to run code at Python startup ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14803 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14803] Add -C option to run code at Python startup
Changes by Nick Coghlan ncogh...@gmail.com: -- stage: - needs patch type: - enhancement versions: +Python 3.3 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14803 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14803] Add -C option to run code at Python startup
Changes by Nick Coghlan ncogh...@gmail.com: -- components: +Interpreter Core ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14803 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14803] Add -C option to run code at Python startup
Changes by Ned Batchelder n...@nedbatchelder.com: -- nosy: +nedbat ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14803 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
