On Thu, 27 Feb 2014 00:25:45 +0000, Steven D'Aprano wrote:
> By the way, if anyone cares what my actual use-case is, I have a
> function that needs to work under Python 2.4 through 3.4, and it uses
> a with statement. With statements are not available in 2.4 (or 2.5,
> unless you give a from __future__ import). So after messing about for
> a while with circular imports and dependency injections, I eventually
> settled on some code that works something like this:
> def factory():
> blah blah blah
> try:
> exec("""def inner():
> with something:
> return something
> """, globals(), mylocals)
> inner = mylocals['inner']
> except SyntaxError:
> def inner():
> # manually operate the context manager
> call context manager __enter__
> try:
> try:
> return something
> except: # Yes, a bare except. Catch EVERYTHING.
> blah blah blah
> finally:
> call context manager __exit__
> blah blah blah
> return inner
So why not something simpler?
def factory():
def inner():
'''Manually operate the context manager in order to maintain
compatibility with Python 2.4 through 3.4.'''
call context manager __enter__
try:
try:
return something
except: # Yes, a bare except. Catch EVERYTHING.
blah blah blah
finally:
call context manager __exit__
blah blah blah
return inner
I claim that the less unnecessary code you write, the fewer bugs you
will have.
Does my code misbehave under any of your target versions?
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