ays to do that,
both on the same machine and across a network.
John Nagle
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software emulator for an x86 machine running DOS.
So you can go into the emulator and connect to the "keyboard" or
"screen" from another program.
John Nagle
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"re.compile", not when .pyc files are generated.
You can call "re.compile" on strings read from an external
source without loading a new module.
John Nagle
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On 3/23/2011 5:14 AM, David Feyo wrote:
I'm trying to automate reverse-ip lookups on domaintools.com.
Sign up for their API. They charge the same as for
web lookups.
John Nagle
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roval process, and can be downloaded and installed
in a standard way.
"easy_install" generally isn't easy. It has some built-in
assumptions about where things are stored, assumptions which
often don't hold true.
John Nagle
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u're using. If you're stil
stuck, give us the list of non-Python modules you're importing,
directly or indirectly.
John Nagle
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#x27;s out there.
Is there a way to get that info portably?
John Nagle
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t) = errorentry # try to unpack
except ValueError as message : # unpack failed
raise(ValueError("%s: bogus entry in 'errors': %s" %
(message, repr(errorentry
...
John Nagl
xternal devices
in Python is useful.)
John Nagle
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(See "http://www.dokidoki6.com/00_index1.html";. Caution,
excessively cute.) Each ideograph is a "word", of course.
Parse this into words:
★12/25/2009★
6%DOKIDOKI VISUAL FILE vol.4を公開しました。
アルバムの上部で再生操作、下部でサムネイルがご覧いただけます。
John Nagle
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onfiguration.
Now freeze the code." At that moment, all the global
analysis and compiling takes place. This allows getting rid
of the GIL and getting real performance out of multithread
CPUs.
John Nagle
--
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th the hardware tagging helping with dispatch. But it probably
wouldn't help all that much. It didn't in the LISP machines.
John Nagle
--
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PU with a separate return
point stack with a depth of 20. Big mistake.
(All of this is irrelevant to Python, though. Most of Python's
speed problems come from spending too much time looking up attributes
and functions in dictionaries.)
John Nagle
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On 4/4/2011 12:47 AM, Gregory Ewing wrote:
John Nagle wrote:
A tagged machine might make Python faster. You could have
unboxed ints and floats, yet still allow values of other types,
with the hardware tagging helping with dispatch. But it probably
wouldn't help all that much. It didn
e out of
the hundred-odd Unicode character sets is going to be foreign,) and
generally internationalized data processing.
Well, actually Unicode support went in back around Python 2.4.
In 3.x, ASCII strings went away, but that was more of a removal.
John
IOError("of network or news source failure")
is raised.
Looking in feedeparser.py, "parse" calls "_open_resource",
which, after much fooling around, builds a urllib2 request,
builds an "opener" via urllib2, and calls its "open" method.
So I'm not see
ork" (if you're on a *nix machine).
See http://pythonwise.blogspot.com/2009/04/pmap.html for example ;)
Unless you have a performance problem, don't bother with shared
memory.
If you have a performance problem, Python is probably the wrong
tool for the job anyway.
On 4/10/2011 3:29 PM, sturlamolden wrote:
On 10 apr, 18:27, John Nagle wrote:
Unless you have a performance problem, don't bother with shared
memory.
If you have a performance problem, Python is probably the wrong
tool for the job anyway.
Then why does Python h
either end restarting, and the other end failing
to respond. All those things happen frequently with serial
ports.
What do you want to do?
John Nagle
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There's a postmortem on the failure of Unladen Swallow by one of the
developers at:
http://qinsb.blogspot.com/2011/03/unladen-swallow-retrospective.html
John Nagle
--
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s a bit array).
C, which originally lacked a "bool" type, got it wrong.
So did Python. Java is in the middle, with an isolated
"boolean" type but a system that allows casts.
John Nagle
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g/library/re.html
"If a group is contained in a part of the pattern that matched multiple
times, the last match is returned."
That's kind of lame, though. I'd expect that there would be some way
to retrieve all matches.
John Nagle
--
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On 4/20/2011 12:23 PM, Neil Cerutti wrote:
On 2011-04-20, John Nagle wrote:
Here's something that surprised me about Python regular expressions.
krex = re.compile(r"^([a-z])+$")
s = "abcdef"
ms = krex.match(s)
ms.groups()
('f',)
The parentheses indicate a
ys() does return a unique list. Each
call to "keys()" returns a new list object unconnected to the
dictionary from which the keys were extracted. But someone may
have decided in a later version to return a generator, as
an optimization. Did that happen?
On 4/21/2011 6:16 AM, Neil Cerutti wrote:
On 2011-04-20, John Nagle wrote:
Findall does something a bit different. It returns a list of
matches of the entire pattern, not repeats of groups within
the pattern.
Consider a regular expression for matching domain names:
kre
E with wildcards at the beginning can't use indices. So
this is very slow for large tables.
Don't worry about having MySQL do the CONCAT. That happens
once during query parsing here, because all the arguments to
CONCAT are defined in the statement.
John Nagle
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uctors and ownership tend not to be too important in Python,
because storage management is automatic.
John Nagle
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er
>>> 1 is (1+1-1)
True
>>> 10 is (10+1-1)
False
That's a quirk of CPython's boxed number implementation. All
integers are boxed, but there's a set of canned objects for
small integers. CPython's range for this is -5 to +256,
incidentally. That's visible through the "is" operator.
Arguably, it should not be.
John Nagle
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On 5/4/2011 5:46 PM, harrismh777 wrote:
John Nagle wrote:
Arguably, Python should not allow "is" or "id()" on
immutable objects. The programmer shouldn't be able to tell when
the system decides to optimize an immutable.
"is" is more of a problem than "i
On 5/5/2011 3:06 AM, Gregory Ewing wrote:
John Nagle wrote:
A reasonable compromise would be that "is" is treated as "==" on
immutable objects.
That wouldn't work for tuples, which can contain references
to other objects that are not immutable.
Such tuples are
On 5/5/2011 6:59 AM, Steven D'Aprano wrote:
On Thu, 05 May 2011 21:48:20 +1000, Chris Angelico wrote:
On Thu, May 5, 2011 at 9:44 PM, Mel wrote:
John Nagle wrote:
On 5/4/2011 5:46 PM, harrismh777 wrote:
Or, as stated earlier, Python should not allow 'is' on immutable
ob
58, CGE Colony
First Street
Tuticorin - 628003
Tamilnadu
Phone no: 91 461 4005333 / 3290473
Fax No: 91 461 4001473
Email : cont...@jjcpl.net
John Nagle
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folder", or "subdirectory".
John Nagle
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hould not be used in production code.
Generalizing multiple inheritance from a tree to a directed
acyclic graph is usually a mistake.
John Nagle
--
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of a lack that Python doesn't
have user-defined immutable objects.
John Nagle
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writing a spam program for Twitter.
John Nagle
--
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lue. That's the kind of thinking which leads to
[1,2] * 2
returning
[1,2,1,2]
John Nagle
--
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ng if there's a pointer to it anywhere. This was all worked
out for LISP and SELF decades ago.
Python allows patching code while the code is executing. This
implies a sizable performance penalty, and causes incredible
complexity in PyPy.
John Nagle
not (a == b)
a != b
will always return the same results if exceptions are raised for
unordered comparison results. Also, exactly one of
a = b
a < b
a > b
is always true - something sorts tend to assume.
If you get an unordered comparison exception,
idn't overflow somewhere
during the computation. If, within the computation, there are
branches based on ordered comparisons, and those don't raise an
exception when the comparison result is unordered, you can reach
the end of the computation with valid-looking but wrong values.
thon 2.6.3.7 (ActiveState) on Linux, on an EeePC 2G Surf.
John Nagle
--
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st mode"; the latter doesn't support FPU exceptions
but does support NaNs.
Many game machines and GPUs don't have full IEEE floating point.
Some don't have exceptions. Others don't have full INF/NaN semantics.
John Nagle
--
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ime.py",
line 426, in build_archive
assert mod.__file__.endswith(EXTENSION_SUFFIXES[0])
AssertionError
Python 3.5.2 / Win7 / AMD64.
John Nagle
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flow.com/questions/32963057/is-there-a-py2exe-version-thats-compatible-with-python-3-5
cx_freeze has been suggested as an alternative, but its own
documents indicate it's only been tested through Python 3.4.
Someone reported success with a development version.
I guess people don't create Python executables much.
John Nagle
--
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ross-version
(Python 2.7, 3.x), and doesn't do "readline" processing?
(No, I don't want to use signals, a GUI, etc. This is simulating
a serial input device while logging messages appear. It's a debug
facility to be able to type input in the console window.)
John Nagle
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me', 'Illinois'),),
(('localityName', 'Chicago'),),
(('streetAddress', '135 S La Salle St'),),
(('organizationName', 'Bank of America Corporation'),),
(('organizationalUnitName', 'Network Infrastructure'),),
(('commonName', 'www.bankofamerica.com'),)),
'subjectAltName': (('DNS', 'mobile.bankofamerica.com'),
('DNS', 'www.bankofamerica.com')),
'version': 3}
How about just returning ALL the remaining fields and finishing
the job? Thanks.
John Nagle
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st Network'),),
(('organizationalUnitName', u'(c) 2006 VeriSign, Inc. - For authorized
use only'),), (('commonName', u'VeriSign Class 3 Public Primary
Certification Authority - G5'),))}
Firefox is happy with that cert. The serial number of the root
cert
#x27;t pass detailed
OpenSSL error codes through in exceptions. The Python exception
text is "[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed
(_ssl.c:581).", which is a generic message for most OpenSSL errors.
John Nagle
On 2/17/2015 12:00 AM,
am:
http://www.animats.com/private/sslbug
Please try that and let me know what happens on
other platforms. Works with Python 2.7.9 or 3.x.
John Nagle
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ed to be 20 seconds, and I increased it to 60. It didn't
help.
This isn't an OS problem. The above traceback was on a Linux system.
On Windows 7, it fails with
"URLError: "
But in both cases, the command line FTP client will work, after a
consistent 20 second delay before the login prompt. So the
Python timeout parameter isn't working.
John Nagle
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?
John Nagle
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On 10/8/2013 10:36 PM, Christian Gollwitzer wrote:
> Dear John,
>
> Am 09.10.13 07:28, schrieb John Nagle:
>> This is the basic transformation of 3D graphics. Take
>> a 3D point, make it 4D by adding a 1 on the end, multiply
>> by a transformation matrix to
2
('glibc', '2.7')
That version of glibc is from October 2007.
Where are these ancient versions coming from? They're
way out of sync with the GCC version.
John Nagle
--
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On 10/11/2013 11:50 PM, Christian Gollwitzer wrote:
> Am 12.10.13 08:34, schrieb John Nagle:
>> I'm trying to find out which version of glibc Python is using.
>> I need a fix that went into glibc 2.10 back in 2009.
>> (http://udrepper.livejournal.com/20948.html)
>>
s.python.org/issue928297
The result under GenToo is bogus:
http://archives.gentoo.org/gentoo-user/msg_b676eccb5fc00cb051b7423db1b5a9f7.xml
There are several programs which fetch this info and
display it, or send it in with crash reports, but
I haven't found any that actually use the result
for anything. I'd suggest deprecating it and
documenting that.
John Nagle
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e that this function has intimate knowledge of how different libc
versions add symbols to the executable is probably only usable for
executables compiled using gcc" isn't even a sentence.
The documentation needs to be updated. Please submit a patch.
John
, President or General Manager
>> 4. Email address of number 3 above
>> 5. Phone number of dealership
If you really want that data, and aren't just hacking, buy it.
There are data brokers that will sell it to you. D&B, FindTheCompany,
Infot, etc.
Sounds like you want
reter like CPython. These make many compile
time optimizations hard. At any time, any thread can monkey-patch
any code, object, or variable in any other thread. The ability
for anything to use "setattr()" on anything carries a high
performance price. That's part of why Unladen Swall
;
> Is this related to Python? What is “PID tuning”, and what have you
> tried already?
See
"http://sts.bwk.tue.nl/7y500/readers/.%5CInstellingenRegelaars_ExtraStof.pdf";
You might also try the OpenHRP3 forums.
John Nagle
--
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r velocity to get angular position,
quaternions are the way to go. If you want to understand
all this, there's a good writeup in one of the Graphics Gems
books.
Unlike complex numbers, these quaternions are always unit vectors.
John Nagle
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calls
of "strcmp (x->identifier, "Int")". A performance win over CPython
is unlikely.
Compare Shed Skin, which tries to infer the type of Python
objects so it can generate efficient type-specific C++ code. That's
much harder to do, and has trouble with very dynamic code, but
what comes out is fast.
John Nagle
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On 10/23/2013 12:25 AM, Philip Herron wrote:
> On Wednesday, 23 October 2013 07:48:41 UTC+1, John Nagle wrote:
>> On 10/20/2013 3:10 PM, victorgarcia...@gmail.com wrote:
>>
>>> On Sunday, October 20, 2013 3:56:46 PM UTC-2, Philip Herron
>>> wrote:
> Nagle re
tent of all messages sent to or from this
> e-mail
> address. Messages sent to or from this e-mail address may be stored on the
> Infosys e-mail system.
> ***INFOSYS End of Disclaimer INFOSYS***
Because of the above restriction, we are unable to repl
usually done in debug mode only, and is sometimes causes
programs with bugs to behave differently when built in debug
vs. release mode.
Sigh.
John Nagle
--
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le are at
>> different skills. And recruiters use MetaBright to find outrageously skilled
>> job candidates.
With tracking cookies blocked, you get 0 points.
John Nagle
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e
stdin and stdout come from "sys", "sys.stdin.buffer" is valid.
That fixes the ""str" does not support the buffer interface
error." But now I get the pickle error "Ran out of input"
on the process child side. Probably because there's a
On 3/12/2015 2:56 PM, Cameron Simpson wrote:
> On 12Mar2015 12:55, John Nagle wrote:
>> I have working code from Python 2 which uses "pickle" to talk to a
>> subprocess via stdin/stdio. I'm trying to make that work in Python
>> 3. First, the subprocess Python
On 3/12/2015 5:18 PM, John Nagle wrote:
> On 3/12/2015 2:56 PM, Cameron Simpson wrote:
>> On 12Mar2015 12:55, John Nagle wrote:
>>> I have working code from Python 2 which uses "pickle" to talk to a
>>> subprocess via stdin/stdio. I'm trying to make that
sing four library bugs and filing
bug reports on all of them. Workarounds are known
for two of the problems. I can't deploy the Python 3
version on the servers yet.
John Nagle
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on 3
comes from having to switch packages because the Python 2
package didn't make it to Python 3.
All the bugs I'm discussing reflect forced package
changes or upgrades. None were voluntary on my part.
John Nagle
--
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On 3/14/2015 1:00 AM, Marko Rauhamaa wrote:
> John Nagle :
>> I'm approaching the end of converting a large system from Python 2
>> to Python 3. Here's why you don't want to do this.
>
> A nice report, thanks. Shows that the slowness of Python 3 adoption i
t reproduces the bug on a tiny snippet of
HTML, and that's been uploaded to the BS4 issues tracker.
I don't have a workaround for that.
All this has cost me about two weeks of work so far.
The "everything is just fine" comments are not helpful.
Denial is not a river in Egypt.
John Nagle
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ix the bug.
John Nagle
--
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but pip3 doesn't know that.
There's "wsgiref", which looks more promising, but has a different
interface. That's not what the Python documentation recommends as
the first choice, but it's a standard module.
I keep thinking I'm almost done with Python 3 hell, but
On 3/29/2015 1:19 PM, John Nagle wrote:
> On 3/29/2015 12:11 PM, Ben Finney wrote:
>> John Nagle writes:
>>
>>> The Python 3 documentation at
>>> https://docs.python.org/3/howto/webservers.html
>>>
>>> recommends "flup"
>>
>>
of which
don't work.
Incidentally, in my last report, I reported problems with BS4,
PyMySQL, and Pickle. I now have workarounds for all of those,
but not fixes. The bug reports I listed last time contain the
workaround code.
John Nagle
--
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On 3/29/2015 7:11 PM, John Nagle wrote:
> Meanwhile, I've found two more variants on "flup"
>
> https://pypi.python.org/pypi/flipflop
> https://pypi.python.org/pypi/flup6
>
> All of these are descended from the original "flup" code base
ock, and
a lock preventing freeing a file cache page is set.
Arguably, paging to disk is obsolete. RAM is too cheap and
disk is too slow.
John Nagle
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tries not to do that, although there are rare
cases when it has to, like this one.
John Nagle
--
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ostgres.
If almost all transactions are SELECTs, performance may not be
too bad, but if there are INSERT and UPDATE transactions on the
same table, performance will be awful.
John Nagle
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On 11/7/2011 1:00 PM, OKB (not okblacke) wrote:
I noticed this (Python 2.6.5 on Windows XP):
CPython is slow. It's a naive interpreter. There's
almost no optimization during compilation. Try PyPy
or Shed Skin.
John Nagle
--
http://mail.
ware and adware
has appeared on major sites. CNet was heavily criticized for
bundling NMap with adware on "download.com")
John Nagle
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run(t):
with lock:
shared_container.append(t.name <http://t.name>)
the `with-statement` will call lock.acquire() and lock.release().
And, importantly, if you leave the "with" via an exception, the
lock will be unlocked.
John Nagle
--
r the test.)
test_site
test test_site crashed -- : [Errno 13]
Permission denied: '/var/www/vhosts/sitetruth.com/.local'
(That looks like a bug in the test suite. It shouldn't be
storing into the user's home directory.)
John Nagle
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interpreter, and allows things that are easy
for such an implementation but very tough to optimize. An
example is the ability to store into the variables of a module
from outside it, and even from another thread. Every attempt
to get rid of the Global Interpreter Lock has hit that problem.
John Nagle
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/chaos.weblogs.us/archives/327
John Nagle
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On 1/9/2012 2:45 AM, Robert Kern wrote:
On 1/9/12 5:35 AM, John Nagle wrote:
Python has some serious problems that preclude optimization.
Basically, the language is designed to be run by a naive (non-optimizing)
interpreter, and allows things that are easy
for such an implementation but very
ne operation.
Python does not "just work". I should be able to command
"yum install python27". (And not clobber the Python 2.6 that
comes with CentOS.)
This sort of thing is why Python is losing market share.
John Nagle
--
ht
-standard, it has to be installed before
installing other things.
In particular, if you're using
somepython setup.py install
don't require setuptools. Setuptools isn't doing anything
for anybody at that point.
"egg" files are usually more trouble than t
On 1/19/2012 12:56 AM, Lele Gaifax wrote:
John Nagle writes:
"egg" files are usually more trouble than they're worth.
I find it really funny you say so, just after another thread where you
proved yourself unable to come up with a working Python environment
lacking an already
(zipelt.filename,"r") as infd :
self.dofilecsv(infile, infd)
This works for data records that are pure ASCII, but as soon as some
non-ASCII character comes through, it fails.
Where is the error being generated? I'm not seeing any place
where there's a conversion to ASCII. Not even a print.
John Nagle
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On 3/7/2013 5:10 AM, Dave Angel wrote:
> On 03/07/2013 01:33 AM, John Nagle wrote:
>> Here's a traceback that's not helping:
>>
>
> A bit more context would be helpful. Starting with Python version.
Sorry, Python 2.7.
>
> If that isn't enough, t
On 3/7/2013 5:10 AM, Dave Angel wrote:
> On 03/07/2013 01:33 AM, John Nagle wrote:
>>
>> "infdraw" is a stream from the zip module, create like this:
>>
>> with inzip.open(zipelt.filename,"r") as infd :
>
> You probably nee
On 3/7/2013 10:42 AM, John Nagle wrote:
> On 3/7/2013 5:10 AM, Dave Angel wrote:
>> On 03/07/2013 01:33 AM, John Nagle wrote:
>>> Here's a traceback that's not helping:
>>>
>>
>> A bit more context would be helpful. Starting with Python version.
&g
.gz file. Then "setup.py install")
Download "BaudotRSS" from SourceForge. (ZIP file, put in your
chosen directory for this program.)
Run: python baudotrss.py --help
I'm thinking of switching to Go.
John Nagle
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ng".
That would be useful to have as a portable function for all USB
devices. Serial port devices are particularly annoying, because their
port number is somewhat random when there's more than one, and changes
on hot-plugging.
John Nagle
--
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eturn lists, not strings. That
would resolve the ambiguity. ASN.1 is a representation for lists, and
hammering those lists into strings loses information.
Is there a workaround for this? Without rebuilding Python
and becoming incompatible?
John Nagle
Animats
--
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Donn Cave wrote:
> In article <[EMAIL PROTECTED]>,
> John Nagle <[EMAIL PROTECTED]> wrote:
>
>
>> The Python SSL object offers two methods from obtaining
>>the info from an SSL certificate, "server()" and "issuer()".
>>The actua
Paul Rubin wrote:
> John Nagle <[EMAIL PROTECTED]> writes:
>
>>The reason this now matters is that new "high assurance" certs,
>>the ones that tell you how much a site can be trusted, are now being
>>deployed,
>
>
> Oh my, I hadn't heard a
Michael Ströder wrote:
> John Nagle wrote:
>
>>The Python SSL object offers two methods from obtaining
>>the info from an SSL certificate, "server()" and "issuer()".
>>The actual values in the certificate are a series of name/value
>>pair
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