On 2007-08-27, Neil Cerutti <[EMAIL PROTECTED]> wrote:
> This sort of suggests a direct solution:
>
> for i in xrange(self.parent.GetPageCount()):
> if i >= self.parent.GetPageCount():
> break
> # do stuff
>
> At least that way you're spared the manual
Processing in Python_ for one
solution.
http://gnosis.cx/TPiP/chap2.txt
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f it is a bug, it is not in the locale code.
>>> '%d' % float('22440125.')
Traceback (most recent call last):
File "", line 1, in
TypeError: int argument required
The documentation for the string formating operation doesn't
specify what happens when you convert a non-int with specifier
'%d'. In defense of your code, there's also no explicit
requirement to do that.
http://docs.python.org/lib/typesseq-strings.html
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orting code every time she encounters a list.
The advantage of such a richly implemented language as Python, is
that a programmer don't need to write a general sorting algorithm
at all.
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ears.
To me, Python's collection of special-purpose string literal
notations is one of its little warts.
Of course, I'm not smart enough to have delivered the ONE TRUE
string literal notation either, but I do have a computer and an
internet connection, so there you are.
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On 2007-08-30, Steve Holden <[EMAIL PROTECTED]> wrote:
> Neil Cerutti wrote:
>> To me, Python's collection of special-purpose string literal
>> notations is one of its little warts.
>
> Well, it's a wart that's shared with many other languages -
> incl
ommon in modern Python code. The hair shirts and thumb-screws
necessary for using exceptions correctly in C++, aren't needed in
Python.
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really some reason "key" IN dict can be implemented
> faster than dict.has_key("key")???
Yes. Looking up the has_key method by name is the slower part.
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We're not afraid of challenges. It's like we always say: If you want to go out
in
s simply in order to get
the code to compile. A common example is a set of classes that
all behave like file streams.
You don't need to do this in Python. Simply have the object
provide the right methods and you are done.
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On 2007-08-31, Lawrence D'Oliveiro
<[EMAIL PROTECTED]> wrote:
> In message <[EMAIL PROTECTED]>, Neil
> Cerutti wrote:
>> Keeping in mind which came first, isn't it at least as
>> accurate to attribute this problem to Python's choice of
>> escape
re composed by the
programmers writing the code. Is it likely that the same person
who wrote a buggy function will know the right contract?
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. In Java (at least in
> HotSpot), the byte code is further compiled to machine code
> before execution; in Python, the byte code is interpreted.
>
> Whether this makes Python an interpreter or a compiler, I don't
> know.
I'd call it an integrated compiler and virtual mac
7;d like to see Python run as fast as C or Lisp, and
> you have a few tens of millions of dollars spare to invest in
> development, I think the Python Software Foundation would love
> to hear from you.
Hmmm. I have four dollars... almost five...
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pronounce
>> Python... well, the way they do, with the stress and something of a
>> drawl on the second syllable. I'm sure it's just as amusing the other
>> way round: we pronounce it with the stress on the first syllable and
>> the characteristic short vowel soun
s will be faster for shortish lengths of subseq. It was
certainly easier to get it working correctly. ;)
def find(seq, subseq):
for i, j in itertools.izip(xrange(len(seq)-len(subseq)),
xrange(len(subseq), len(seq))):
if subseq == seq[i:j]:
return i
return -1
--
thing :)
Y'all may be thinking of The Euler Project, which provides math
puzzles for programmers.
http://projecteuler.net/
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'm a new user. What library should I use so that I can launch
>>>> program in linux using python?
>>>>
>>>
>>> subprocess
>>>
>> Hmm, there are some others...
>
> subprocess subsumes them all.
And someday soon, subprocess will RULE THE WORLD! BWA-HAHAHAHAH!
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if the first element of y is non-null.
>
> Such as? Seriously people, a little more verbosity wouldn't
> hurt here. This isn't a mystery game.
>>> if "": True
...
>>> if 0: True
...
>>> if []: True
...
>>> if {}: True
...
>>
On 2007-09-10, Chris Mellon <[EMAIL PROTECTED]> wrote:
> On 9/10/07, Neil Cerutti <[EMAIL PROTECTED]> wrote:
>> On 2007-09-08, Wildemar Wildenburger <[EMAIL PROTECTED]> wrote:
>> > Lawrence D'Oliveiro wrote:
>> >>>>> if y[0]:
>>
On 2007-09-10, Chris Mellon <[EMAIL PROTECTED]> wrote:
> On 9/10/07, Neil Cerutti <[EMAIL PROTECTED]> wrote:
>> Agreed; but I prefer 'if y[0] == ""', absent more context and
>> better names.
>
> Probably should use u"" if you
a quibble with a test that will raise an exception when
> the anticipated condition is true. Your test is patently
> absurd, as you would have discovered had you bothered to try
> it:
"if y[0] == "" expresses more, i.e., that I expect y[0] to
contain a Python byte string.
On 2007-09-11, Robert Brown <[EMAIL PROTECTED]> wrote:
> Neil Cerutti <[EMAIL PROTECTED]> writes:
>
>> On 2007-09-02, Steven D'Aprano
>> <[EMAIL PROTECTED]> wrote:
>>> A big question mark in my mind is Lisp, which according to
>>&g
ld be "Enum
> 2008", and the next major update could be called "Enum
> Professional Capowie!!!".
I like the (priviledged) code names adopted by the Linux
community for special versions, e.g., Enum 2.7.1 (Flapjacks).
This would really tie the Enum-using community together, and make
mess
mber shortcut proposal. Most proposals
don't even address that point.
Does it become:
class Foo:
def __init__():
.bar = 40
or
class Foo:
def __init__(.):
.bar = 40
or
class Foo:
def __init__(self):
.bar = 40
I guess the middle one is the most consistent, but it seems
er respondent asked about use cases.
A mapping with sorted keys could theoretically be convenient when
your keys are comparable but not hashable.
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the length
of seq, my_sum(seq) terminates with the value of the sum of all
the items in seq for any length of seq.
But really I prefer the first first plain English version. ;)
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On 2007-09-13, Ian Clark <[EMAIL PROTECTED]> wrote:
> Neil Cerutti wrote:
>> On 2007-09-13, Gigs_ <[EMAIL PROTECTED]> wrote:
>>> Can someone explain me this
>>>
>>>>>> def f(l):
>>> if l == []:
>>> return
er. A little intuitive leap, perhaps, will allow you to note
that the case of a two-element list can actually be handled
without a special case:
def f(l):
if len(l) < 2:
return l
else:
return f(l[1:]) + l[:1]
Final note: for reasons of tradition, base cases are almost
always set up as it was in the original function, checking for a
zero-length list, and returning a new empty list, the truly
simplest base case. Another intuitive leap is possibly required
to note that a one-element list is not a special case after all:
it's a reverse of a zero-element list with that one element
appended.
def f(l):
if len(l) == 0:
return []
else:
return f(l[1:]) + l[:1]
Clear as mud?
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; necessary in the interactive helper you start by calling
> help().
The interactive help function is cool. You need to download and
install the HTML version of the standard docs to take the utmost
advantage of it.
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OK for the directories to
be unordered, which doesn't appear to be the case.
> But this doesn't do the trick, as I also have to save the
> hierarchy level of the current folder as well...
The above does store the hierarchy, as the number of nesting
levels.
ditreedb['New Client']['Offers']['Denied']
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mming is *functions*.
>
> Functional lists are not quite the same. They are actually
> recursive datastructes. In Python you would model them as
> nested tuples:
>
> t = (a, (b, (c, ...(d, None)
Tuples won't work for cyclic data, though.
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ot the same as
> superclass of type(self). Super iterates over the latter,
> where you expect the former.
I can't blame a person for thinking that the call
super(A, self)
is taking the superclass of A. A is perhaps too prominently
placed.
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s happening.
super.foo()
to me, is even more confusing.
self.super.foo()
or
super(self).foo()
seem like improvements. Unfortunately, neither is one of the
current alternate proposals. The closest competing proposal in
PEP3135 is:
self.__super__.foo()
That syntax seems justified given the
to Python's basic assignment semantics and clever type
hierarchy that it's hard to even sensibly promote anything other
than the current implementation without completely redesigning
Python.
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ther text
> editor still surviving uses such an antiquated concept.
The existence of command mode allows plain old keystrokes to be
commands--it potentially makes commands easier to type. Emacs
users don't find it to be a compelling advantage. ;)
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s the very cool elisp scripting language. I'm not
so keen on Vim's built-in scripting language.
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t integrates with Python's unit testing modules, so if
you need to "graduate", it is simple to do so.
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On 2007-10-01, Arnaud Delobelle <[EMAIL PROTECTED]> wrote:
> Finally, arithmetic would become very confusing if there were
> three distinct numeric types; it already causes enough
> confusion with two!
Scheme says: It's not that bad.
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I am free of all prejudi
On 2007-10-01, Arnaud Delobelle <[EMAIL PROTECTED]> wrote:
> On Oct 1, 6:26 pm, Neil Cerutti <[EMAIL PROTECTED]> wrote:
>> On 2007-10-01, Arnaud Delobelle <[EMAIL PROTECTED]> wrote:
>>
>> > Finally, arithmetic would become very confusing if there were
>
On 2007-10-02, Arnaud Delobelle <[EMAIL PROTECTED]> wrote:
> On Oct 2, 12:42 pm, Neil Cerutti <[EMAIL PROTECTED]> wrote:
>> On 2007-10-01, Arnaud Delobelle <[EMAIL PROTECTED]> wrote:
>> > Scheme has prefix numeric operators, so that 1/2 is
>> > unamb
do people react to the word "pointer" as though
> computers have to wear underwear to conceal something shameful
> going on in their nether regions?
Refraining from thinking about pointers (unless I have to) saves
wear and tear on the old bean. I also like to think of 5 as an
integer most of the time.
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:0:-1] => "cb", not "cba". Changing the "end" value to
> x[n:-1:-1] results in an empty string.
Your proposed sequence, x[n:0:-1] is half-open on the wrong end.
When k is -1 then j must also be negative. This is because
there's no way to refer to the element one before the first
element without using a negative index value for j.
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On 2007-10-05, Lawrence D'Oliveiro <[EMAIL PROTECTED]> wrote:
> In message <[EMAIL PROTECTED]>, Neil Cerutti wrote:
>
>> On 2007-10-03, Lawrence D'Oliveiro <[EMAIL PROTECTED]>
>> wrote:
>>> In Python, all names _are_ variables. They are not &q
On 2007-10-15, Simon Brunning <[EMAIL PROTECTED]> wrote:
> On 10/15/07, Dmitri O.Kondratiev <[EMAIL PROTECTED]> wrote:
>> To clarify my point:
>> reverse() is a lucky one - Python has variants of *this particular*
>> function both for lists and strings. Yet what about other list functions?
>> Ho
mmutable.
>
><http://c2.com/cgi/wiki?ValueObjectsShouldBeImmutable>
And strings are considered value objects because...
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yway.
You can obtain a practical workaround using the int built-in
function.
>>> int('110', 2)
6
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operator import truth
from collections import defaultdict
result = defaultdict(list)
for k, g in groupby(sorted(cls.dArguments, key=truth), truth):
result[k].extend(g)
I like your initial attempt better.
P.S. I didn't realize until working out this example that extend
could consume an ite
t.
> if __name__ == '__main__':
>print SOME_CONST
>if not do_something():
> try_somethin_else()
That idiom is useful in modules for launching tests or examples
that should not be run when the module is imported.
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On 2007-10-26, Bruno Desthuilliers <[EMAIL PROTECTED]> wrote:
> Neil Cerutti a écrit :
>> On 2007-10-25, Bruno Desthuilliers
>> <[EMAIL PROTECTED]> wrote:
>>> The canonical case for small scripts is to have first all
>>> functions and globals defined
ent to os.chmod.
>>
>> You mean instead of
>>
>> import this
>> os.chmod(filename, os.R_OK | os.W_OK | os.X_OK)
>>
>> which explicitly (rather than implicitly) spells it out?
>
> And the equivalent of ``os.chmod(filename, 0777)`` looks like
1:08) [MSC v.1310 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import timeit
>>> timeit.Timer('len(seq)', 'seq = range(100)').timeit()
0.20332271187463391
>>&g
x
return balance, post_transaction
fred_balance, fred_post = account(1500)
joe_balance, joe_post = account(12)
fred_post(20)
joe_post(-10)
fred_balance()
1520
joe_balance()
2
Python classes will of course nearly always win, though the idiom
looks like it might be faster (I don't have Python 3000 to try it
out).
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On 2007-10-30, Jean-Paul Calderone <[EMAIL PROTECTED]> wrote:
> On Tue, 30 Oct 2007 15:25:54 GMT, Neil Cerutti <[EMAIL PROTECTED]> wrote:
>>On 2007-10-30, Eduardo O. Padoan <[EMAIL PROTECTED]> wrote:
>>> This is a FAQ:
>>> http://effbot.org/pyfaq/why-d
On 2007-10-30, George Sakkis <[EMAIL PROTECTED]> wrote:
> On Oct 30, 11:25 am, Neil Cerutti <[EMAIL PROTECTED]> wrote:
>> On 2007-10-30, Eduardo O. Padoan <[EMAIL PROTECTED]> wrote:
>>
>> > This is a FAQ:
>> >http://effbot.org/pyfaq/why-does-pyth
On 2007-10-31, George Sakkis <[EMAIL PROTECTED]> wrote:
> On Oct 31, 8:44 am, Neil Cerutti <[EMAIL PROTECTED]> wrote:
>> On 2007-10-30, George Sakkis <[EMAIL PROTECTED]> wrote:
>>
>>
>>
>> > On Oct 30, 11:25 am, Neil Cerutti <[EMAIL PROTECTE
hink tuples didn't used to have any
> methods at all).
Thanks for the interesting note. I didn't know that tuples
originally had no methods. That made len mandatory, I suppose.
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The Pastor would appreciate it if the ladies of the congregation would lend
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here?
>
> I was simply responding to a subthread that only evaluated
> closures as a SICP-style OOP implementation mechanism. That is
> missing the point of closures.
It really depends on how wide your definition of primitive object
system is. Can you come up with a use-case for nonloc
On 2007-11-01, nico <[EMAIL PROTECTED]> wrote:
> The following example returns a string type, but I need a tuple...
>>>> var = ("Hello")
>>>> print type(var)
>
>
> I need that for a method parameter.
var = "hello",
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x on the fly. Is there
>> anything similar for Python?
>>
>
> I believe IPython can do this:
>
> http://ipython.scipy.org/moin/
IPython's syntax coloring doesn't work with Windows 2000 and up,
since (last I checked) it relies on a readline.py file, which
relies
On 2007-11-01, Chris Mellon <[EMAIL PROTECTED]> wrote:
> On Nov 1, 2007 3:01 PM, Neil Cerutti <[EMAIL PROTECTED]> wrote:
>> On 2007-11-01, Lee Capps <[EMAIL PROTECTED]> wrote:
>> >
>> > On Nov 1, 2007, at 1:45 PM, braver wrote:
>> >>
odule is an object, would
> not every function be a method of that module and every variable be a
> field of that module?
You are almost correct. Every identifier/name in Python is
conceptually an attribute of an object. But identifiers in Python
are not typed. It is the objects that t
On 2007-11-02, Tim Golden <[EMAIL PROTECTED]> wrote:
> Neil Cerutti wrote:
>> On 2007-11-01, Chris Mellon <[EMAIL PROTECTED]> wrote:
>>> On Nov 1, 2007 3:01 PM, Neil Cerutti <[EMAIL PROTECTED]> wrote:
>>>> On 2007-11-01, Lee Capps <[EMAIL PROTECTE
return self.look
def next(self):
item = self.look
try:
self.look = self.iter.next()
except StopIteration:
if self.exhausted:
raise
else:
self.exhausted = True
return item
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We'v
re.compile('(?Px+)|(?Pa+)')
m = r.match('aaxaxx')
if m:
for k in r.groupindex:
if m.group(k):
# Find the token type.
token = (k, m.group())
I wish I could do something obvious instead, like m.name().
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After finding no qualified
ple-parser-1
Thank you. Much better.
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On 2007-01-10, Fredrik Lundh <[EMAIL PROTECTED]> wrote:
> Neil Cerutti wrote:
>> A found some clues on lexing using the re module in Python in
>> an article by Martin L÷wis.
>
>> Here, each alternative in the regular expression defines a
>> named group. Scan
with an impressive plethora of demos.
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which as usual fell upon her. --Church Bulletin Blooper
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On 2007-01-10, Steven Bethard <[EMAIL PROTECTED]> wrote:
> Neil Cerutti wrote:
>> For use in a hand-coded parser I wrote the following simple
>> iterator with look-ahead.
>
> There's a recipe for this:
>
>http://aspn.activestate.com/ASPN/Cookbook/Python/
Python on those platforms, even if you use the crummy old
COMMAND.COM. I believe it's because Python on those platforms in
a console application, which on NT, 2000 and XP doesn't support
ANSI escape sequences. It makes IPython's appearance less cool. :-(
Try http://effbot.org/download
t;def __init__ (self, base_object):
> # ( copy all attributes )
> ...
>
> This looks expensive. Moreover __init__ () may not be available
> if it needs to to something else.
>
> Thanks for suggestions
How does it make sense to cast a base to a derived in your
ap
e):
if alist is None:
alist = []
for objekt in alist: _validateParameter(objekt)
list.__init__(self, alist)
You will no longer need to call append.
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it here:
http://sourceforge.net/projects/spe/
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tance). Is this a valid use
> case for type-changing behavior or is there a better, more
> "mainstream" OO design pattern for this ? I can post the
> relevant code if necessary.
Since the type gets changed before __init__ finishes, I don't see
any problem with it. It sounds cool.
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> os.system('cscript /nologo ' + pathname + '\test.vbs')
Use / instead of \, or \\ instead of \.
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orted(g))
print
if __name__ == "__main__":
import doctest
doctest.testmod()
I really wanted nested join calls for the output, to suppress
that trailing blank line, but I kept getting confused and
couldn't sort it out.
It would better to use the os.path module, but I couldn't find
the function in there lets me pull out path tails.
I didn't filter out stuff that didn't match the date path
convention you used.
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thIdentity(1)
>>>> timeit.Timer("x = x", "from __main__ import x,y").repeat()
> [0.20761799812316895, 0.16907095909118652, 0.16420602798461914]
>>>> timeit.Timer("x = y", "from __main__ import x,y").repeat()
> [0.2090909481048584, 0.1968839168548584, 0.16479206085205078]
>
> Anyone want to argue that this is a worthwhile optimization? :)
Perhaps. But first test it with "==".
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the names of its
class's attributes, and recursively of the attributes of its
class's base classes. The resulting list is sorted
alphabetically. [...]
It's unclear to me what attributes an object could have that
aren't included in the above list.
Note: Because dir()
; v=v.replace('""','"')
> return(l)
>
> v=rex.match(v).group('value')
> AttributeError: 'NoneType' object has no attribute 'group'
When the regex doesn't match, match returns None.
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. How copacetic! It is the null module. ;-)
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3 * 4 ok 30 100% 100% Outgoing"
>>> import re
>>> r = re.search('\*\s+(\d+)', g)
>>> r.group()
'* 4'
>>> r.group(1)
'4'
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We're not afraid of challenges. It's like we always say: If you want to go out
On 2007-01-16, Victor Polukcht <[EMAIL PROTECTED]> wrote:
> On Jan 16, 5:40 pm, Neil Cerutti <[EMAIL PROTECTED]> wrote:
>> On 2007-01-16, Victor Polukcht <[EMAIL PROTECTED]> wrote:
>>
>> > Actually, i'm trying to get the values of first field (Globa
nt Python's deque is, but it's possible a
deque would provide a faster heap than a contiguous array. C++'s
std::deque is the default implementation of C++'s
std::priority_queue for that reason (unless I'm confused again).
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on library contains a recipe for this in the itertools
recipes in the documentation (5.16.3).
def grouper(n, iterable, padvalue=None):
"grouper(3, 'abcdefg', 'x') --> ('a','b','c'), ('d','e','f'), ('g&#
On 2007-01-18, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Neil Cerutti:
>> One more idea, cribbed from the linked list thread elsewhere:
>> it might be nice if your Heap could optionally use an
>> underlying collections.deque instead of a list. I don't know
&g
ncorrect, but can't understand where
> exactly.
Break it up using verbose notation to help yourself. Also, use
more helpful names. With names like var1 and var2 you might as
well not used named groups.
r = re.compile(r"""(?x)
(?P [^(]+ )
(?P \d+ )
\)
\s+
(
On 2007-01-18, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Neil Cerutti:
>> One more idea, cribbed from the linked list thread elsewhere:
>> it might be nice if your Heap could optionally use an
>> underlying collections.deque instead of a list. I don't know
&g
print attr
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)
print cons(5, cons(3, nil))
print cons(cons(5, (cons(7, nil))), cons(cons(5, cons(3, nil)), nil))
print nil
print llist([1, ['a', 'b', 'c'], 2, 3])
There's lots more more stuff to add, but the fun wore out. I'd
like if it the cdr of nil could actually be nil,
k with stupid top-posting, too.
It's been an interesting journey, from some unix-based terminal
email, to Lotus Notes (ARRGH!), then a happy time using IMAP, and
now back to (ARRGH!).
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easily.
def sprintf(format, *objects):
return format % tuple(objects)
Since strings are immutable it's not convenient to provide a
pass-out parameter as in C. If you want to check for errors
you'll have to catch the exceptions, rather than inspect the
return value as you can in C.
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e docs installed, it functions somewhat like
perldoc. Type help() at the interactive prompt to get started.
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Will the last person to leave please see that the perpetual light is
extinguished --sign at New England church
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xcellent support on this group at the moment.
Or just compose your own little function by hand. A stack-based
solution (implemented using a list as a stack) should be easy enough.
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And now the sequence of events in no particular order. --Dan Rather
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ngs that contains every name
you'd like to accept. Names probably aren't worth validating,
although you might reasonably reject a few things, like the empty
string.
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write it better. In other words,
writing the code organizes my thoughts. I usually have to
fully understand something, even to get a kludgey solution to
work. The Kludgey solution informs the design of something
better.
2. a) Got to 1. a)
In the case above, I've tried to
er will also work.
>>> def foo(x, s=[0]):
... print s[0], x
... s[0] += 1
...
>>> for i in range(5):
... foo("!")
...
0 !
1 !
2 !
3 !
4 !
The latter is not as nice, since your "static" variable is easy
to clobber by passing something into the function.
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ce become actual attributes per se.
A nice use for this class might be to pass large mutable objects
to a functions as if it were immutable without needing to copy
them. Unfortunately it only works for one level of call. I think.
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y terminal (rxvt-unicode) is able to
> display those chars.
What have you tried?
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))
I don't really expect it to work, but if anything will, that is
it. Curses supports only ASCII and a some special symbol codes
defined by curses.
> I have
>
> #!/usr/local/bin/python
> #coding: iso8859-15
Be sure to write your non-ASCII strings as unicode literals, and
then encod
On 2007-01-27, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> How can I convert a string to a char list?
> for example
>
> "hello" --> ['h','e','l','l','o']
>
> I have been searching but I can't find my answers
list("hello")
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On 2007-01-27, Thomas Dickey <[EMAIL PROTECTED]> wrote:
> Neil Cerutti <[EMAIL PROTECTED]> wrote:
>> I don't really expect it to work, but if anything will, that
>> is it. Curses supports only ASCII and a some special symbol
>> codes defined by curses.
>
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