* Robert Kern:
On 2010-03-03 09:39 AM, Mike Kent wrote:
What's the compelling use case for this vs. a simple try/finally?
original_dir = os.getcwd()
try:
os.chdir(somewhere)
# Do other stuff
finally:
os.chdir(original_dir)
# Do other cleanup
A custom-written context manager looks nicer and can be more readable.
from contextlib import contextmanager
import os
@contextmanager
def pushd(path):
original_dir = os.getcwd()
os.chdir(path)
try:
yield
finally:
os.chdir(original_dir)
with pushd(somewhere):
...
I don't think a general purpose ScopeGuard context manager has any such
benefits over the try: finally:, though.
class pushd( Cleanup ):
def __init__( self, path ):
original_dir = os.getcwd()
os.chdir( path )
self._actions.append( lambda: os.chdir( original_dir ) )
Disclaimer: haven't tested this, but it just occurred to me that for such small
init/cleanup wrappers the Cleanup class provides a nice alternative to
@contextmanager, as above: fewer lines, and perhaps even more clear code. :-)
Cheers,
- Alf
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