I think I like generator comprehension in this case better than either
list comprehension or a filter because both of the latter create a new
full result list before the loop even begins. At least I suppose they
do. Also, I think Mitja's suggestion if not test: continue and
Terry's filter function
[EMAIL PROTECTED] wrote:
Do you think this discussion is a proof that the following principle
got violated, or do you think that loop with condition is not such an
atomic thing to be subject to this: There should be one -- and
preferably only one -- obvious way to do it.
Mitja's suggestion
Peter Hansen [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
[EMAIL PROTECTED] wrote:
Do you think this discussion is a proof that the following principle
got violated, or do you think that loop with condition is not such an
atomic thing to be subject to this: There should be one
Hi All,
I apologize if this was brought up before, I couldn't find any prior
art :-).
On more than one occasion, I found myself wanting to use a conditional
loop like this (with Invalid syntax error, of course):
for i in c if test:
print i*2
...because it's similar to
[EMAIL PROTECTED] wrote:
On more than one occasion, I found myself wanting to use a conditional
loop like this (with Invalid syntax error, of course):
for i in c if test:
print i*2
Maybe there's been a PEP, don't really know...
Currently, the only sensible alternative
Thank you for replying, Mitja! That *is* a nice alternative.
Do you think it's a good idea to ask on comp.python.devel if they would
be interested in a PEP about this (provided there is none)?
Cheers,
Sergey.
--
http://mail.python.org/mailman/listinfo/python-list
On 2006-03-26, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Hi All,
I apologize if this was brought up before, I couldn't find any prior
art :-).
On more than one occasion, I found myself wanting to use a conditional
loop like this (with Invalid syntax error, of course):
for i in c if
[EMAIL PROTECTED] writes:
On more than one occasion, I found myself wanting to use a conditional
loop like this (with Invalid syntax error, of course):
for i in c if test:
print i*2
...because it's similar to the list comprehension construct:
[i*2 for i in c if
Why not combine the two:
I guess because (at least in source code) you're doing a loop twice
:-). I don't know what a compiler would do. I think though that the
for i in c if test: construct is more readable and maybe can even be
better optimized.
Thanks!
Sergey.
--
Rather than a list comprehension, it would be faster and more
memory-efficient to use a generator comprehension. Just change the
square brackets to parentheses:
for j in (i*2 for i in c if test):
print j
Grant Edwards wrote:
On 2006-03-26, [EMAIL PROTECTED] [EMAIL PROTECTED]
[EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
Why not combine the two:
I guess because (at least in source code) you're doing a loop twice
:-). I don't know what a compiler would do. I think though that the
for i in c if test: construct is more readable and maybe can even be
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