Re: Is this PEP-able? fwhile

[wu wei]

On Tue, Jun 25, 2013 at 10:19 AM, Fábio Santos fabiosantos...@gmail.com
 wrote:

 for X in (i for i in open('largefile') if is_part_of_header(i)):

 The above code would be wasting time on IO and processing. It would load
 another line and calculate the condition for every line of the large file
 and I just wanted to loop over the few header lines.

 itertools.takewhile and fwhile/for..while actually stops the loop when the
 condition is not meant, while your example keeps checking the condition
 until the end of file, even though it is a generator expression.

Ah yes, of course, my bad.

It's still possible by raising a StopIteration within the condition
function:

def is_part_of_header(x):
if header_condition:
return True
else:
raise StopIteration

But yes, by this point any clarity of the generator expression approach
comes with the cost of more explicit setup of the breaking condition.
-- 
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Re: Re: Objects in Python

[wu wei]

On Fri, Aug 24, 2012 at 7:14 PM, Evan Driscoll drisc...@cs.wisc.edu wrote:

 On 8/23/2012 22:17, alex23 wrote:
  But Roy's point was that referring to 'a' as a 'variable' makes no
  sense, as it's not an allocated piece of memory.

 Does the computer just remember what 'a' refers to by keeping notes
 about it in Narnia?


You're correct. It will be, on some level, a piece of memory. But I don't
recall seeing any guarantee that the memory used to hold the dictionary key
of 'a' in one scope would be re-used if 'a' was first deleted and then
re-created. It's an implementation detail about the language that we don't
care about.
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Fwd: Checking a string against multiple matches

[wu wei]

Sorry to hassle the list with this but I'm getting irregular spam from this
asshole, clearly triggered by comp.lang.python posts being resent to the
python-list. I've contacted Yahoo abuse -and- the list administrators but
its still occurring.

Is anyone able to remove this guy from the list? I've asked him to stop but
he rather abusively replied saying that he wasn't doing anything wrong.

-- Forwarded message --
From: Stephen Meredith [EMAIL PROTECTED]
Date: Tue, Dec 2, 2008 at 11:08 AM
Subject: Re: Checking a string against multiple matches
To: alex23 [EMAIL PROTECTED]


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Here is the current e-mail list:
*
The email list:
1) [EMAIL PROTECTED]
2) [EMAIL