Hi,
I think that would be useful to have an improved
version of the "try" statement, as follows:
try(retrys=0,ti meout=0):
# things to try
except:
# what to do if failed
and having the following semantic:
for i in range(retrys):
try:
# things to try
except:
if i < retrys:
i += 1
sleep(timeout)
else:
# what to do if failed
else:
break
Of course, "break" may be the last statement in the
"try" branch, and "try"'s "else" may be ommited
completely.
Can't think of a syntax to keep it look like a
statement rather than a function.
Opinions? Is it worth for a PEP?
Sorin
_______________ _______________ ____
Yahoo! FareChase: Search multiple travel sites in one click. http://farechase.yahoo.com 3 2260
Sori Schwimmer wrote: Hi,
I think that would be useful to have an improved version of the "try" statement, as follows:
try(retrys=0,ti meout=0):
<snip> sleep(timeout)
<snip>
At the very least, "timeout" is the wrong wording, "delay" would be more
appropriate. A timeout is usually associated with starting a task and
waiting for it to complete, and continuing if it fails to complete in a
given timeframe, typically also aborting the task at the same time (ie.
executing a database query, connecting to a server, waiting for an
event/lock, etc.).
--
Lasse Vågsæther Karlsen http://usinglvkblog.blogspot.com/
mailto:la***@vk arlsen.no
PGP KeyID: 0x2A42A1C2
Sori Schwimmer wrote: Hi,
I think that would be useful to have an improved version of the "try" statement, as follows:
try(retrys=0,ti meout=0): # things to try except: # what to do if failed
and having the following semantic:
for i in range(retrys): try: # things to try except: if i < retrys: i += 1 sleep(timeout) else: # what to do if failed else: break
The gold standard for language syntax changes is "compelling use cases"
- if introduced, how often will the construct be used? Is there a python
program out there (preferably in the standard library) which would be
*markedly* improved by the change? What is so repugnant about the
equivalent, currently valid way of writing it? -- Hypothetical and
theoretical arguments don't carry much weight in the Python community
("Practicali ty beats purity" and all that.)
And remember - your goal isn't ultimately to convince me or someother
person on comp.lang.pytho n, it's to convince Guido.
On 2005-10-27, Sori Schwimmer <sx***@yahoo.co m> wrote: Hi,
I think that would be useful to have an improved version of the "try" statement, as follows:
try(retrys=0,ti meout=0): # things to try except: # what to do if failed
and having the following semantic:
for i in range(retrys): try: # things to try except: if i < retrys: i += 1 sleep(timeout) else: # what to do if failed else: break
The "i += 1" line is almost certainly wrong.
Of course, "break" may be the last statement in the "try" branch, and "try"'s "else" may be ommited completely.
And that's pretty much exactly how I usually write it:
for i in range(retries):
try:
whatever
break
except retryableExcept ionList:
sleep(delay)
Can't think of a syntax to keep it look like a statement rather than a function.
Opinions?
I don't see what's wrong with the for loop construct.
You can add an else: clause to the for loop to detect the case
where you ran out of retries:
for i in range(retries):
try:
whatever
break
except retryableExcept ionList:
sleep(delay)
else:
whatelse
Is it worth for a PEP?
I don't think you can come up with a syntax that is really that
much better than the for loop, but give it a go if you like.
--
Grant Edwards grante Yow! My BIOLOGICAL ALARM
at CLOCK just went off... It
visi.com has noiseless DOZE FUNCTION
and full kitchen!! This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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by: White Wolf |
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Hi,
I cannot believe my eyes, but so far I could not find out what is the name
of the construct, which is built from one try block and the catch clauses
(handlers). I am not looking for a grammar name, but something people can
remember, like handler. But is not handler, because those are the catch
clauses and the try does not belong there. I have looked at all my books
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Is there...
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by: Sori Schwimmer |
last post by:
"i += 1" is wrong there. I had in my mind at first a
"while" statement.
Sorry...
Sorin
|
by: Sori Schwimmer |
last post by:
0) Sorry, I don't know how to post a reply in the same
thread.
1) Grant Edwards wrote:
> The "i += 1" line is almost certainly wrong.
You're certainly write, as I acknowledged in a follow
up "suggestion for (re)try statement - correction'
2) Rocco Morreti wrote:
> What is so repugnant about the equivalent, currently
valid way of writing it?
Nothing "repugnant". We have in almost all procedural
|
by: clintonG |
last post by:
Has somebody written any guidelines regarding how to determine when
try-catch blocks should be used and where their use would or could be
considered superfluous?
<%= Clinton Gallagher
METROmilwaukee (sm) "A Regional Information Service"
NET csgallagher AT metromilwaukee.com
URL http://metromilwaukee.com/
URL http://clintongallagher.metromilwaukee.com/
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Any suggestions?
Thanks, Rob
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Is there any other article available on the same?
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