[PEP 8](http://www.python.org/dev/peps/pep-0008/#indentation) says not to have *any* arguments on the first line if you use a hanging indent. E.g.,

                    tincan_process = subprocess.Popen(
                        [tincan_bin], stdout=subprocess.PIPE, stderr=core_log)

I don't know whether we normally follow that guideline, though.