The following fragment is from a tiny maintenance script that, among other things, edits itself, by rewriting the line that ends with '### REPLACE'. ###################################################################### import re import fileinput LAST_VERSION = 'VERSION 155' ### REPLACE service = Service(url='http://url.to.service') if service.version_string == LAST_VERSION: sys.exit(0) for line in fileinput.input(sys.argv[0], inplace=True): if re.search(r"### REPLACE$", line): print ("LAST_VERSION = '%s' ### REPLACE" % service.version_string) else: print line, # ...and goes on to do more stuff... ###################################################################### This script is meant to run periodically (via cron), and "do more stuff" whenever the fetched value of service.version_string differs from what it was at the time of the script's prior invocation. (The interval of time between such changes of value varies from one change to the next, but it is always of the order of several weeks.) Hence this script needs to preserve state between invocations. The rationale for the acrobatics with fileinput above is to make this script completely self-contained, by circumventing the need some external means (e.g. a second file, or a DB) of preserving state between invocations. Is there a better way to circumvent the requirement for an external repository of state information? G -- http://mail.python.org/mailman/listinfo/python-list
