, then requiring external
> the line-renumbering utilities that AppleSoft BASIC required
> :-S
Though its graphics and sound were far inferior, as a C64 user I
was really jealous of the speed of the built-in Apple disk
drives. The only programming I did on them was typing in some of
the program
to begin.
We can help better if you show some of your code; a minimal
cut-down version that exhibits the error is ideal.
Are you literally getting a RuntimeError? That would be weird.
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assert len(elts) == 0
> elt = elts[0]
I'm confused. Your rewrite looks like an assertion error or an
IndexError.
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gt; I have one more:
>
> Dictionaries should iterate over their items instead of their keys.
>
> Looking forward to contrary opinions.
Consider the 'in' operator.
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return fn(x,y)
> ... return do_stuff
>
> I understand that python is not a functional language, but it
> frustrates me at times.
>>> import operator
>>> equal = get_do_stuff(operator.eq)(7, 7.0)
True
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re used to be good reasons for trying to leave some extra room
>>
>> on the clipboard and avoid reallocating the block but I thought that was
>>
>> over a long time ago.
>>
>>
>>
>> To strip NULs off the end of the string use
is keyboard,
Till is fingers were bloody stumps,
And the very last words that were entered in his .blog were:
GUI Builders are for chumps, Lord, Lord!
Those GUI builders are for chumps.
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ot indentation - so we're
> talking more like REXX than Python. In fact, it's not uncommon
> for poetry to be laid out on a single line with slashes to
> divide lines:
There's lots of poetry with significant indentation, though.
Imbuing the shape of the text on the page with significance is a
thing.
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On 2013-09-18, Chris Angelico wrote:
> On Thu, Sep 19, 2013 at 12:57 AM, Neil Cerutti wrote:
>> There's lots of poetry with significant indentation, though.
>> Imbuing the shape of the text on the page with significance is a
>> thing.
>
> And you can do that wit
On 2013-09-18, wxjmfa...@gmail.com wrote:
>>>> 1and 0
> 0
>>>> 'a'or 1
> 'a'
>>>> 5if True else 999
> 5
Curse you, FSR!
Oh, wait...
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do a strlen() (or the
> wide-character equivalent; I forget its name) on the results.
Python can't really know if you're pasting text or a screenshot
or what.
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cumenation any more but nothing stops you
from examining the result in the next doctest and making yourself
happy about it.
>>> x = input("indeterminate:")
>>> result = "'{}'".format(x))
>>> result.startswith("'") and result.endswith("'")
True
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On 2013-09-23, Neil Cerutti wrote:
> Perhaps try the "advanced API" and define your oen
> OutputChecker to add the feature that you need.
>
> Figuring out how to best invoke doctest with your modified
> OutputChecker will take some digging in the source, probably
> l
nced API" and define your oen OutputChecker
to add the feature that you need.
Figuring out how to best invoke doctest with your modified
OutputChecker will take some digging in the source, probably
looking at doctest.testmod. I don't see an example in the docs.
> Hope these examples helped to understand better what my problem
> is.
Yes, I think it's well-defined now.
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at least 1000 rows, an example:
>
> 0,0,KGD,0,DME,0,,0,0
>
> The values I want to extract are KGD and DME (columns 3 and 5).
Use the csv module.
http://docs.python.org/2/library/csv.html
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erated in general; they may
be lost or converted to delimiters on some systems, and
hence must not be relied on.
So putting a raw CR in a binary chunk maybe be intolerable, and
you need to use a different encoder. But I'm out of my element.
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ll flatten on itself, as in the
recursive version, because the stack frames do all the
bookkeeping for you. CPython has a limited number of stack frames
though, so the version above might be preferable for certain
levels of nesting.
[1] http://en.wiktionary.org/wiki/bikeshed
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On 2013-09-26, Neil Cerutti wrote:
> def flatten(seq):
>
> [1] http://en.wiktionary.org/wiki/bikeshed
In that spirit, it occurs to me that given current Python
nomenclature, 'flattened' would be a better name.
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hat excel file and save that excel file
Show more code, please. And please describe the error more fully.
What did you hope to happen, and what happened instead? What have
you tried so far?
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no multi-select, etc.), and
so it's possible a Visual Basic widget was used instead. That
would leave the cell contents blank when read, as above.
You will need to retrieve the value from the combo-box object
directly somehow.
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On 2013-09-27, Neil Cerutti wrote:
> On 2013-09-27, somesh g wrote:
>> Hi..there
>>
>> I want to read the combo box in excel by using "xlrd" but in
>> the output it is showing empty message, its not reading the
>> combo box can u guys help me how
just want to shove the food directly into my stomach.
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poker, yes?
>
> I'm going to go out on a limb and suggest that such a suggestion is
> outside what people generally consider acceptable on this list.
It's reassuring that even a guy like Nikos has his White Knights.
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nd
> the frustration that leads people to want him to suffer great
> pain.
I don't want him to suffer great pain, but it would please me if
it were possible to annoy him in some way. Like maybe with the
sound of a mosquito. B! BzZ!
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ry of callbacks, with the
simple functions defined in-line and the more complex functions
defined just before that and referenced instead.
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On 2013-10-01, Steven D'Aprano wrote:
> On Mon, 30 Sep 2013 18:36:28 +0000, Neil Cerutti quoted:
>
>> Why can??t lambda forms contain statements?
>
> Gah! Please fix your news client! (I see you're using slrn.)
> The \x92 bytes found in your message are ap
me value in telling someone why you might
killfile them. But actual *plonks* are, I think, manifestation of
spotlight syndrome.
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gt; v = ceil(v*100)/100.0
[*] You're binding v to a new float object here, but not
modifying y. Thus, this code will have no effect on y.
You need to assign to y[k] here instead.
for k, v in d.items():
y[k] = round(v, 2)
> return
Bare returns are not u
lso it means code for this modified Python wouldn't run on
> other non-modified interpreters, but it is at least
> theoretically possible without breaking Python's assumptions.
In any case it's so easy to implement yourself I'm not sure
there's any point.
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c": 10.0, "d": 10.0}, {"a": 90.0, "b": 0.0, "c": 0.0, "d":
> 10.0}]
>
> However, at the URL, the values show up as 90.43278694123
You'll need to convert them to strings yourself before submitting
them, by using % formatting or str.format.
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= re.compile(
r"""(?P\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\s+
(?P\-)\s+
(?P\-)\s+
(?P\[(.*?)\])\s+# You can even insert comments.
(?P\"(.*?)\")\s+
(?P\d{3})\s+
(?P\d+)\s+
(?P\"\")\s+
(?P\((.*?)\))""", re.VERBOSE)
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to store unchecked
UTF-16 such as Windows filenames as UTF-8. It is also
incompatible with CESU encoding (described below).
So Python's interpretation is conformant, though not without some
disadvantages.
In any case, "\ud800\udc01" isn't a valid unicode string. In a
perfect world it would automatically get converted to
'\u00010001' without intervention.
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On 2013-10-08, Neil Cerutti wrote:
> In any case, "\ud800\udc01" isn't a valid unicode string. In a
> perfect world it would automatically get converted to
> '\u00010001' without intervention.
This last paragraph is erroneous. I must have had a typo in my
te
clusive way"?
Ned, pay no attention to the person whalopping that dead horse.
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type (except in
the case of complex numbers (Ha!)).
r == c is equivalent to r == abs(c), which returns the magintude
of the complex number.
I wonder why it was deemed reasonable to do that but not for the
float constructor to do the same, or even int.
> BTW, one of the earliest things tha
On 2013-10-10, MRAB wrote:
> On 10/10/2013 16:57, Rotwang wrote:
>> On 10/10/2013 16:51, Neil Cerutti wrote:
>>> [...]
>>>
>>> Mixed arithmetic always promotes to the wider type (except in
>>> the case of complex numbers (Ha!)).
>>>
>
On 2013-10-10, Ian Kelly wrote:
> On Thu, Oct 10, 2013 at 11:48 AM, Neil Cerutti wrote:
>> Woah. I thought I was going by what the docs say:
>>
>> Python fully supports mixed arithmetic: when a binary
>> arithmetic operator has operands of different numeric types
On 2013-10-10, Oscar Benjamin wrote:
> On 10 October 2013 18:48, Neil Cerutti wrote:
>> I guess the "if appropriate" part eluded my eye. When *is* it
>> appropriate? Apparently not during an equal test.
>>
>>>>> 5.0 == abs(3 + 4j)
>> False
>
On 2013-10-11, Steven D'Aprano wrote:
> On Thu, 10 Oct 2013 17:48:16 +0000, Neil Cerutti wrote:
>
>> >>> 5.0 == abs(3 + 4j)
>> False
>
> Did you maybe accidentally rebind abs? If not, what version of
> Python are you using?
Honestly, I think I got m
dgment.
https://mail.python.org/pipermail/python-list/
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and template specialization, for
example; you get a generic interface with a decoupled
implementation which can be optimized for specific types at need.
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Python Language Reference 8.7 Class definitions.
Here's a link to the 3.3 version of those docs:
http://docs.python.org/3.3/reference/compound_stmts.html#class-definitions
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s, not simply to
all-bits zero as (I think) C does.
This isn't as great a feature as it seems, since the zero value
for some built in types, e.g., map, is unusable without manual
construction. In addition, you can't define a zero value for your
own types.
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>> global) and you'll see the difference.
>
> Ah, that makes sense. Thanks to everyone who corrected my
> misunderstanding.
>
> Well, actually, no it doesn't. I wonder why C specifies such
> behaviour? Why would you want non-global arrays to be filled
> wit
GCC into an executable.
What executable would GCC compile from a program that matched
this grammar?
spamgram = spam1, { ', ', more_spam }, '.'
spam1 = 'Spam'
more_spam = spam, { ', ', spam }
spam = 'spam'
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On 2013-10-22, Piet van Oostrum wrote:
> Neil Cerutti writes:
>> Context-sensitive grammars can be parse, too.
>
> That's not English. Do you mean "parsed"?
Thanks, yes, I meant parsed.
> But context-sentitive grammars cannot be specified by BNF.
Yes
On 2013-10-22, Mark Lawrence wrote:
> On 22/10/2013 20:27, Neil Cerutti wrote:
>> On 2013-10-22, Piet van Oostrum wrote:
>>> Neil Cerutti writes:
>>>> Context-sensitive grammars can be parse, too.
>>>
>>> That's not English. Do you mean &q
On 2013-10-23, David wrote:
> On 23 October 2013 22:57, wrote:
>>
>> a LARGE number of Python programmers has not even bothered learning version
>> 3.x.
>
> OMG. Please provide their names. We'll send Doug & Dinsdale.
I can send Mr. Wendt and Mr. Kid
second class OS? Ducks and runs for cover :)
They usually don't. Users of most distributions have an awesome
device called a package manager.
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ll. Yours is not to reason
why, Jamison. You've left out the body of the letter!
...
Fine. Send it that way, and tell them the body will follow.
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o
>>> babel.
>>
>> I think you do him a disservice. I'm pretty sure it's genuine,
>> bona-fide, 24K, dyed-in-the-wool, 99 and 44/100 pure babble.
>
> I think it's even better than that... maybe even 28.8K!
>From my own bailiwick I'd say it's Grade A Medium Amber.
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On 2013-10-29, Steven D'Aprano wrote:
> On Mon, 28 Oct 2013 13:20:17 +0000, Neil Cerutti wrote:
>
>> On 2013-10-27, Ben Finney wrote:
>>> I have no particular objection to you responding to those
>>> instances of bad behaviour that I've omitted.
>>
ed about performance that you're
> willing to trade clarity for it, you shouldn't be using Python
> in the first place.
When you detect a code small, as Wolfgang did, e.g., "I'm
repeating the same exact test condition in several places," you
should not simply ignore it
houldn't be embroiled in the morass of
interactive programming.
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factor++;
>square=Math.pow(factor,exponent);
> }
> factor--;
> document.write(factor," ");
> square=Math.pow(factor,exponent);
> number=number-(factor*factor);
> square=1;
> factor=1;
> }
> document.wr
ython operators and identifiers.
> square=1;
> factor=1;
> print("+",number);
> return
A bare return at the end of a Python function is not needed. All
functions return None if they fall off the end.
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except IOError:
pass
with open(self.full_path, 'b') as infile:
# etc...
shutil.copy(tempname, self.output_csv)
This avoids clobbering output_csv unless new data is succesfully
written. I believe TempDirectory isn't available in Python 2, so
some other way of creating that path will be needed, and I'm too
lazy to look up how. ;)
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than
that characterization accords.
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On 2013-10-31, rusi wrote:
> On Thursday, October 31, 2013 8:50:27 PM UTC+5:30, Neil Cerutti wrote:
>> wrote:
>> > This suggests that Pascal went against established practice.
>> > This is false. FORTRAN used = and that was a mistake caused by
>> > the langua
On 2013-11-01, wrote:
> hello every expert,
> When I use telnetlib to send a command, I meet some troubles, I
> have read some documents about telnetlib and modify many times,
> but the script doesn't work all the time.
What goes wrong?
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source bytes. Unless there's some
context I'm not privy to.
u'x' is (hopefully) decoded already, but the encoding of 'x' is
unknown.
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COWardly :-)
>>
>> Well, maybe the issue is MOOt.
>
> Ugh, if only these puns were like CALF-way funny...
>
> *dives for cover*
Phew! I can't stomach stomach stomach this digression.
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> convention for the start of your signature, and many people and UAs
> will ignore text after it.)
It's '-- ', with a space after, to be precise.
But I like it the way he's doing it! His messages are greatly
improved from where I'm sitting..
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rage scheme, you can't. So by
storing the data this way, you are promising yourself that you'll
never need to write that query, or at least, you won't need to do
it very often.
> I still don't know why you push me to create an extra table
> instead.
Because
On 2013-11-08, ru...@yahoo.com wrote:
> Just wanted to let you know that not everybody here is an
> asshole. It is just that assholes, by their nature, are the
> loudest.
Hey man, pass that over!
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but
I haven't tried it for that.
> I'd use this select if it was in Python, but I don't see much
> need for it.
Same here. Perhaps the real value of a switch is that it seems to
be a more natural way of thinking about execution. The caveat to
that is most *actual* switch implementations are a mess.
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rings down to one string is a lot
> less common. So, let's have some real-world use cases and then
> we can talk recommendations.
I'd like to know what "string replacement" is supposed to mean in
the context of Python.
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"A politician is an arse
ng right, proper and correct been so thoroughly
celebrated. Except perhaps when my C++ program compiles without
warnings. That's pretty good, too.
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e. e. cummings
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is night," you are making an assertion about a
position on the surface of the earth and its relationship to the
sun.
If you are not discussing a specific a position on the Earth,
then you cannot make a meaningful assertion about night or day at
all. Night and Day are not qualities of the entir
with feature X type question is
> normally "gnus" - although I don't know what "Gmail-like style" is.
slrn. Is good.
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e. e. cummings
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Options
Click the File Types tab in the Folder Options menu.
There will be an upper view with registered filed types, and some
buttons below far making changes to them.
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those numbers, you want:
[...]
print data['0']
print data['1']
print data['2']
print data['3']
print data['4']
[...]
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line
writer.writerow({f: f for n in fields})
for record in reader:
# Change a few fields
# [...]
writer.writerow(record)
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ahead and dauntlessly! Make rapid progres!"
--Ghost
On 2011-11-21, Neil Cerutti wrote:
> On 2011-11-21, ray wrote:
>> Is there a way to capture the keys outside of the for loop so
>> when the for loop is entered, only data is extracted?
>
> I have sometimes done the following type of thing, since
> DictReader doesn't
e you might need that won't work. The
following assumes you'll need less than 1000.
counter = itertools.count()
...
with open("%03d" % counter.next(), "w") as the_next_file:
...
My Python < 3.0 is rusty, so sorry if I messed that up.
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always held with the "anti-functional style conspiracy"
interpretation of Python's lambda expressions. They were added
but grudgingingly, made weak on purpose to discourage their use.
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a
On 2011-11-28, Gregory Ewing wrote:
> Neil Cerutti wrote:
>> I've always held with the "anti-functional style conspiracy"
>> interpretation of Python's lambda expressions. They were added
>> but grudgingingly, made weak on purpose to discourage their
>
for each part of the
program.
The resultant refactored programs are much easier to test, read
and maintain.
TLDR: "Called-only-once" functions like main are useful as
documentation, hooks for testing, and for unraveling a snarl of
global variables.
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On 2011-12-07, Terry Reedy wrote:
> It does not pretend that surrounding statements with
> parentheses turns them into expressions.
> ;-)
I like being in a sexpression. Aww YEH!
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os.path.basename(sys.argv[0]).
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starting point for learning
pointers, though since you already know C that won't do you as
much good.
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hen you could as well write C++ compatible C and be
pretty happy with the results.
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On 2011-12-21, Grant Edwards wrote:
> On 2011-12-21, Neil Cerutti wrote:
>> On 2011-12-20, Paul Rubin wrote:
>>> Grant Edwards writes:
>>>> Oops. I should have mentioned this is for embedded systems
>>>> programming so templates in general (and ST
7;m only half joking... :)
>
> Half joking, indeed. I happen to know for a fact that there
> are *fourteen* people on the planet who understand it.
One of its greatest contributions to computer science were
Glassbarrow's C++ puzzles. They likely couldn't have been as
ch
On 2011-12-23, Neil Cerutti wrote:
> Is the misfeature that Python doesn't evaluate the default
> argument expression every time you call the function? What
> would be the harm if it did?
...you know, assuming it wouldn't break existing code. ;)
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--
htt
ing
>> multiple inheritence was a bug and asking it to be removed.
>
> Both of these could arguably be called misfeaures, but not
> bugs.
Is the misfeature that Python doesn't evaluate the default
argument expression every time you call the function? What would
be
On 2011-12-23, Steven D'Aprano wrote:
> On Fri, 23 Dec 2011 13:13:38 +0000, Neil Cerutti wrote:
>> On 2011-12-23, Neil Cerutti wrote:
>>> Is the misfeature that Python doesn't evaluate the default
>>> argument expression every time you call the function?
formatting should not
> be deprecated at all.
When it becomes necessary, it's possible to optimize it by
hoisting out the name lookups.
...
outfil_write = outfil.write
append_newline = "{}\n".format
...
outfil_write(append_newline(t))
...
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On 2012-01-03, Stefan Krah wrote:
> Neil Cerutti wrote:
>> > In the real-world telco benchmark for _decimal, replacing the
>> > single line
>> >
>> > outfil.write("%s\n" % t)
>> >
>> > with
>> >
>> >
On 2012-01-03, Neil Cerutti wrote:
> On 2012-01-03, Stefan Krah wrote:
>> Neil Cerutti wrote:
>>> > In the real-world telco benchmark for _decimal, replacing the
>>> > single line
>>> >
>>> > outfil.write("%s\n"
words in
the registry. You still have to copy of the text, but only
once. The C++ implementation starts to smell sort of like
Python. ;)
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100 -s "n=7.92" "'%s' % n"
100 loops, best of 3: 0.965 usec per loop
C:\WINDOWS>python -m timeit -n 100 -s "n=7.92" "'{}'.format(n)"
100 loops, best of 3: 1.17 usec per loop
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an idea that is usually a bad
practice, then it should be challenged. The possible broken-nose
of a questioner is a small price to pay for the education of the
peanut gallery.
If a questioner does not wish to defend what they are doing, he
or she has that right, of course.
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Neil Cerutti
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generator in an object with __enter__
and __exit__ methods for you.
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Neil Cerutti
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pecifically, it confuses
> almost everyone the first time they encounter it that "a += b"
> is not the same as "a = a + b".
If you've ever implemented operator=, operator+, and operator+=
in C++ you'll know how and why they are different. A C++
programmer would be wondering how either can work on immutable
objects, and that's where Python's magical rebinding semantics
come into play.
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Neil Cerutti
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Pike.
>>
>> (With apologies to Larry Wall)
>
> Were one inclined to troll a bit, one might be tempted to claim
> that using C++ is prima facie evidence of not understanding
> C++.
>
> Not that I would ever claim something inflamitory like that...
On the Python newsgro
On 2012-01-13, Evan Driscoll wrote:
> On 01/13/2012 10:54 AM, Neil Cerutti wrote:
>> If you've ever implemented operator=, operator+, and operator+=
>> in C++ you'll know how and why they are different.
>
> At the same time, you'd also know that that implementi
ent option for writing shell scripts,
particularly if your shell is cmd.exe.
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On 2013-02-05, Grant Edwards wrote:
> On 2013-02-05, Neil Cerutti wrote:
>> On 2013-02-05, Walter Hurry wrote:
>>>> Sorry, I'm a Linux guy. I have no clue what that means.
>>>
>>> Hooray for common sense! Python is great, but it's silly to us
On 2013-02-15, Oscar Benjamin wrote:
> if score > best_score or best_score is None:
You need the None check first to avoid an exception from the
comparison.
if best_score is None or score > best_score:
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