Suggested python feature: allowing except in context maneger
Hello. I read this is a good place to give some suggestions for features in
python. If not, please let me know.
This is an example of a code I normally use in my everyday work:
import logging
try:
with open('sample_data/READM.md') as f:
print (len(f.read()))
except FileNotFoundError:
logging.error("File not found")
As you can see I have 2 levels of indentation, which can add some pain to
the work with the context manager. This code without context manager, can
be replaced by this code:
import logging
try:
f = open('sample_data/READM.md') as f:
print (len(f.read()))
except FileNotFoundError:
logging.error("File not found")
finally:
f.close()
And while this offers less indentations, it skips the usage of the very
handy context manager.
I would like to suggest an alternative syntax, that will, in a sense, apply
the best of both worlds:
import logging
with open('sample_data/README.md') as f:
print (len(f.read()))
except FileNotFoundError:
logging.error("File not")
As "with" applies the behavior of the "try / finally" it feels like a
natural part of this syntax. This could provide a cleaner code.
If this idea is accepted, there are several things that need to be
discussed, like what to do with "else" or "finally" statement following a
context manager. I'm not sure about the proper way to handle this.
With hopes for an even more readable future
Yair
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Re: Couldn't install numpy on Python 2.7
Chris Angelico wrote: > On Thu, 13 Jun 2024 at 10:58, wrote: > > > > Chris, > > > > You seem to have perceived an insult that I remain unaware of. > > If you're not aware that you're saying this, then don't say it. > Er, um, that really makes no sense! :-) How can one not say something that one isn't aware of saying? -- Chris Green · -- https://mail.python.org/mailman/listinfo/python-list
Re: in Python: (101 102 103 201 202 203 301 302 303 401 402 403 )
Paul Rubin writes:
> HenHanna writes:
>> is there another (simple) way to write this?
>
> Yes, but please consider doing these easy exercises yourself instead of
> fobbing them onto other people.
Hen's probably just an experimental GPT. You, with your limited
resources, can never train it.
I'd say you can't beat the verbosity, or lack thereof of just plain zsh/bash:
$ echo {1,2,3,4}0{1,2,3}
101 102 103 201 202 203 301 302 303 401 402 403
Phil
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Re: Suggested python feature: allowing except in context maneger
> On 13 Jun 2024, at 11:01, Yair Eshel via Python-list > wrote: > > I read this is a good place to give some suggestions for features in > python. Best place these days is to raise an idea on https://discuss.python.org/ Beware that this idea has come up in the past and was rejected. Barry -- https://mail.python.org/mailman/listinfo/python-list
Re: Couldn't install numpy on Python 2.7
Hey, everyone! I believe the original question has been answered, and tempers seem to be flaring in sub-threads, so let's call this thread done and move on to other interesting topics. Thank you for your support! -- ~Ethan~ Moderator -- https://mail.python.org/mailman/listinfo/python-list
Suggested python feature: allowing except in context maneger
Yair Eshel wrote at 2024-6-13 13:01 +0300:
> ...
>I would like to suggest an alternative syntax, that will, in a sense, apply
>the best of both worlds:
>
>import logging
>with open('sample_data/README.md') as f:
> print (len(f.read()))
>except FileNotFoundError:
> logging.error("File not")
Are you aware that in the case of a `FileNotFoundError`
no context manager is created (the context manager is the `f`
in your code).
Why not use:
try:
with open()...
...
except FileNotFoundError:
...
I do not think that your use case requires a `with` extension.
--
Dieter
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Re: Suggested python feature: allowing except in context maneger
On 13Jun2024 19:44, dieter.mau...@online.de wrote: Why not use: ``` try: with open()... ... except FileNotFoundError: ... ``` This is exactly what the OP was expressing dissatisfaction with. I'm -1 on the idea myself - not every combination of things needs additional syntactic support, and doing stuff like merging an `except` with a `wtih` is bound to introduce some weird corner case, complicating its semantics. Cheers, Cameron Simpson -- https://mail.python.org/mailman/listinfo/python-list
Re: Suggested python feature: allowing except in context maneger
Cameron, I'm not really sure I got your point. I've used the "file not found" exception as an example for a behavior typical on context managers. This could be a failure to connect to DB, or threads. It also applies to any kind of possible exception, whether cased by the context manager itself or the lines inside it. Long story short, this syntax change is as useful as context managers are On Fri, 14 Jun 2024, 01:49 Cameron Simpson, wrote: > On 13Jun2024 19:44, dieter.mau...@online.de > wrote: > >Why not use: > >``` > >try: > > with open()... > >... > >except FileNotFoundError: > > ... > >``` > > This is exactly what the OP was expressing dissatisfaction with. > > I'm -1 on the idea myself - not every combination of things needs > additional syntactic support, and doing stuff like merging an `except` > with a `wtih` is bound to introduce some weird corner case, complicating > its semantics. > > Cheers, > Cameron Simpson > -- https://mail.python.org/mailman/listinfo/python-list
