[Python-Dev] Possible context managers in stdlib (original) (raw)

Reinhold Birkenfeld reinhold-birkenfeld-nospam at wolke7.net
Fri Jul 8 23:26:25 CEST 2005

Phillip J. Eby wrote:

At 10:24 PM 7/8/2005 +0200, Reinhold Birkenfeld wrote:

with sys.trace Note that it's currently not possible to inspect the trace/profile hooks from Python code, only from C, so that might be, um, interesting to implement.

That was beyond my short view... if it can't be implemented, it won't.

* pprint: with pprint.printer (used for print) Interesting; I'm not sure if I like it.

* os: with os.currentdirectory What does this do? Oh, I get it. The name's not very obvious. I would've expected a more imperative name, something like 'with os.setcwd()' or 'with os.pushdir()'.

I didn't think about the names too long. ;)

with os.modifiedenv with os.umask/uid/gid etc. Yeah, again I would expect more verbish names, but these are at least easier to grasp than currentdirectory was.

Names can be found, of course.

* curses: with curses.wrapper with logging.Logger * tty: with tty.raw with tty.cbreak * cgitb: with cgitb.enabled What do these do?

curses: curses.wrapper currently is a function which restores sane terminal settings after the curses program bails out. It could be a context manager too. Similar is tty.raw and tty.cbreak. These switch terminal modes, and in case of an uncaught exception the terminal will stay in this state. Context managers would restore the "sane" mode on exit.

logging.Logger: hm, I didn't think about that properly. cgitb: enables or disables the full traceback view (Ok, it wouldn't be so useful).

Reinhold

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