contextmanager for locale

[Mathias Panzenböck]

When I generate certain files I have to write a date formated as english text,
but the error messages (if there are any) I'd like to keep in the system
language. I propose to add this (or a similar) contextmanager:

@contextmanager
def localectx(category, newlocale=None):
oldlocale = locale.getlocale(category)
locale.setlocale(category, newlocale)
try:
yield
finally:
locale.setlocale(category, oldlocale)

Example usage:

with localectx(locale.LC_TIME,('en','UTF8')):
sdate = time.strftime('%a %b %d %Y')

spec_file.write('''
%%changelog

* %s Maintainer Name <maintainer-***@public.gmane.org>
''' % sdate)


-panzi

[Mathias Panzenböck]

Off topic:

Here would be a with-expression or inline with (like the inline if) handy:

spec_file.write('''
%%changelog

* %s Maintainer Name <maintainer-***@public.gmane.org>
''' % (time.strftime('%a %b %d %Y') with localectx(locale.LC_TIME,('en','UTF8'))))

However, this would be a very long line. Not very clean code.

-panzi