Opening an editor for interactive use
Hi all, (I am sure there is a recipe somewhere, but I can't find it.) How does one open an editor while in the middle of an interactive program, let the user do some editing and closing, and then capture the text that was edited? I am reminded of subversion or CVS when they open an $EDITOR session for the check-in log entry. I tried os.popen, but it fired off vim in the background--not useful. Then I tried os.system, but that only returns the return code (126 in my case) after you close the editor. Perhaps I need to write to a file and read it--shouldn't there be a cleaner way? Thanks W -- http://mail.python.org/mailman/listinfo/python-list
git_revision issues with scipy/numpy/matplotlib
I installed py27-numpy / scipy / matplotlib using macports, and it ran without
failing.
When I run Python I get the following error:
$>> which python
/Library/Frameworks/Python.framework/Versions/2.7/bin/python
$>> python
Python 2.7.3 (v2.7.3:70274d53c1dd, Apr 9 2012, 20:52:43)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
File "", line 1, in
File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/__init__.py",
line 128, in
from version import git_revision as __git_revision__
ImportError: cannot import name git_revision
I get the same error for all three packages. Is this a MacPorts issue or a
different issue?
I am running OS X 10.6 with the Intel Core i5 architecture. At one point I
thought this was a 64-bit versus 32-bit issue, viz.:
>>> import platform
>>> platform.architecture()
('64bit', '')
but I would have thought the MacPorts install would have resolved that.
Any help would be appreciated.
Thanks!
-s
--
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Re: git_revision issues with scipy/numpy/matplotlib
I think the easiest thing to do would be to remove the python.org Python entirely, kill it from the path (which I've already done), and install directly a MacPorts version of Python. Any caveats or warnings about getting rid of the /Library/Frameworks/Python directory? On Jul 7, 2012, at Jul 7 8:40 AM, Hans Mulder wrote: > On 7/07/12 14:09:56, Ousmane Wilane wrote: >>> "H" == Hans Mulder writes: >> >>H> Or you can explicitly type the full path of the python you want. >> >>H> Or you can define aliases, for example: >> >>H> alias apple_python=/usr/bin/python alias >>H> macport_python=/opt/local/bin/python >> >>H> lfpv=/Library/Frameworks/Python.framework/Versions alias >>H> python_org_python=$lfpv/2.7/bin/python >> >> >> Or alternatively use `port select --set' to make one of the MacPort version >> the >> default: >> >> imac:~ wilane$ port select --list python >> Available versions for python: >> none >> python25-apple >> python26 >> python26-apple >> python27 (active) >> python27-apple >> python32 > > That would work if the OP had /opt/local/bin early in his searcht path. > However, the OP has installed Python27 from python.org, and that has > prepended /Library/Frameworks/Python.framework/Versions/2.7/bin to > his PATH, overriding anything he does with "port select". > > He could, of course, change his PATH and move /opt/local/bin to the > front and then use "port select". > > -- HansM > -- > http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Academic citation of Python
On Sat, 16 Jun 2012 14:01:12 +0100, Mark Lawrence wrote: >On 16/06/2012 04:24, Mark Livingstone wrote: >> Hello! >> >> I wish to properly cite Python in an academic paper I am writing. >> >> Is there a preferred document etc to cite? >> >> Thanks in advance, >> >> MArkL > >The main website www.python.org and possibly the sites for Jython, >IronPython and PyPY? He's probably looking for an IEC or ANSI standard, like "Information technology Programming languages C INCITS/ISO/IEC 9899-2011[2012] (ISO/IEC 9899-2011, IDT)". I don't think URLs qualify as standards documents. -- Rich Webb Norfolk, VA -- http://mail.python.org/mailman/listinfo/python-list
Re: BUSTED!!! 100% VIDEO EVIDENCE that WTC7 was controlled demolition!! NEW FOOTAGE!!! Ask yourself WHY havn't I seen this footage before?
> Ask yourself WHY havn't I seen this footage before? > > OK, why haven't you seen this footage before? -- http://mail.python.org/mailman/listinfo/python-list
Strange set of errors
Greetings all,
I've recently begun using Python to do scientific computation, and I wrote
the following script to find approximate eigenvalues for a semi-infinite
matrix:
from pylab import *
from numpy import *
from scipy import *
def bandstructure(N,s):
b = s/4.0
jmax = 10 + N**2
spectrum1 = [0]*2*N
spectrum2 = [0]*2*N
spectrum3 = [0]*2*N
for k in arange(1, 2*N+1, 1):
A = zeros( (jmax,jmax) )
i = 0
while i <= jmax-1:
if i <= jmax-2:
A[i,i+1] = b
A[i+1,i] = b
A[i,i] = ((k + 2.0*i*N)/N)**2
i = i+1
else:
A[i,i] = ((k + 2.0*i*N)/N)**2
i = i+1
#This portion of the code builds a matrix twice as large to check
against
B = zeros( (2*jmax,2*jmax) )
i = 0
while i <= 2*jmax-1:
if i <= 2*jmax-2:
B[i,i+1] = b
B[i+1,i] = b
B[i,i] = ((k + 2.0*i*N)/N)**2
i = i+1
else:
B[i,i] = ((k + 2.0*i*N)/N)**2
i = i+1
x = linalg.eigvals(A)
y = linalg.eigvals(B)
j = 1
while j<=3:
if abs(y[j]-x[j]) <= 10.0**(-5):
j = j + 1
else:
print 'jmax not large enough to obtain accurate results'
spectrum1[k-1] = x[0] + 0.5*s
spectrum2[k-1] = x[1] + 0.5*s
spectrum3[k-1] = x[2] + 0.5*s
plot (k, spectrum1, k, spectrum2, k, spectrum3)
xlabel('k (energy level)')
ylabel('E/E_r')
title('Finite Size Band Structure, N = %d, s = %f' % (N, s))
grid(true)
When I run this script, I get the following message, which I can't figure
out:
Traceback (most recent call last):
File "", line 1, in
File "bandstruc.py", line 61, in bandstructure
plot (k, spectrum1, k, spectrum2, k, spectrum3)
File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/pylab.py",
line 2028, in plot
ret = gca().plot(*args, **kwargs)
File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/axes.py",
line 2535, in plot
for line in self._get_lines(*args, **kwargs):
File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/axes.py",
line 437, in _grab_next_args
for seg in self._plot_2_args(remaining[:2], **kwargs):
File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/axes.py",
line 337, in _plot_2_args
x, y, multicol = self._xy_from_xy(x, y)
File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/axes.py",
line 266, in _xy_from_xy
nrx, ncx = x.shape
ValueError: need more than 0 values to unpack
Also, I've been having trouble with the plot function in matplotlib. For
example, I enter the following in the terminal:
>>> from pylab import *
>>> plot([1,2,3])
[]
I'm reasonably sure that the issue in the first big error message is just an
indexing error on my part, but I have no idea what the second thing means.
Every time I run the plot([1,2,3]) I get a different ending number that
seems to vary randomly.
Could anybody please help me out with these problems?
Thanks,
Stephen
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Re: what is the difference between st_ctime and st_mtime one is the time of last change and the other is the time of last modification, but i can not understand what is the difference between 'change'
The Windows stat() call treats things differently, FROM: http://msdn.microsoft.com/en-us/library/14h5k7ff%28v=vs.80%29.aspx st_ctime Time of creation of file. Valid on NTFS but not on FAT formatted disk drives. I don't think that Windows has a concept of a "change time" for meta data (though that would be nice). How's that for compatibility ;) NOTE: I am a C programmer and new to python, so can anyone comment on what the st_ctime value is when os.stat() is called on Windows? Kris On 9/28/12 9:25 AM, Chris Angelico wrote: On Sat, Sep 29, 2012 at 1:18 AM, Christian Heimes wrote: Am 28.09.2012 17:07, schrieb Chris Angelico: In the future please read the manual before replying! ;) You are wrong, ctime is *not* the creation time. It's the change time of the inode. It's updated whenever the inode is modified, e.g. metadata modifications like permission changes, link/unlink of hard links etc. Whoops, my bad! Sorry. I was remembering some other APIs with similar terminology. Lesson: Check the docs, they're more reliable. ChrisA -- This message is NOT encrypted ---- Mr. Kristen J. Webb Chief Technology Officer Teradactyl LLC. 2301 Yale Blvd. SE. Suite C7 Albuquerque, NM 87106 Phone: 1-505-338-6000 Email: kw...@teradactyl.com Web: http://www.teradactyl.com Home of the True incremental Backup System NOTICE TO RECIPIENTS: Any information contained in or attached to this message is intended solely for the use of the intended recipient(s). If you are not the intended recipient of this transmittal, you are hereby notified that you received this transmittal in error, and we request that you please delete and destroy all copies and attachments in your possession, notify the sender that you have received this communication in error, and note that any review or dissemination of, or the taking of any action in reliance on, this communication is expressly prohibited. Regular internet e-mail transmission cannot be guaranteed to be secure or error-free. Therefore, we do not represent that this information is complete or accurate, and it should not be relied upon as such. If you prefer to communicate with Teradactyl LLC. using secure (i.e., encrypted and/or digitally signed) e-mail transmission, please notify the sender. Otherwise, you will be deemed to have consented to communicate with Teradactyl via regular internet e-mail transmission. Please note that Teradactyl reserves the right to intercept, monitor, and retain all e-mail messages (including secure e-mail messages) sent to or from its systems as permitted by applicable law. -- http://mail.python.org/mailman/listinfo/python-list
Re: Aggressive language on python-list
a forum faster than trolls and dicks feeding off each other, until there is nothing left but trolls and dicks. A single troll doesn't do much harm -- few of them have the energy to spam a news group for long periods, drowning out useful posts. But even if you had a more rational response *raises eyebrow* and saved that reaction for actual trolling and not someone who simply disagreed with you, I ask again, what makes you think your response will change that troll's behavior, when in actuality, your kind of response is exactly what most trolls hope to elicit? Did it help in the case I mentioned? As I said, I do not believe that Dwight Hutto is a troll. I believe he is merely badly behaved. And yes, I do believe that confronting him has changed his behaviour, at least for now. Not immediately, of course. His immediate response was to retaliate and defend himself. Naturally -- very few people are self-honest enough to admit, even to themselves, when they are behaving badly. But in the intervening weeks, we, this community, has done anything but ignore him. We're still talking about him *right now*. We're just not necessarily talking *to* him. And the few times that people do respond directly to Dwight, they make it very clear that their response is guarded and on sufferance. And there have been no further outbursts from Dwight, at least not so far. So, yes, I think we've gotten the message across. How will others know that I do not agree with your advice? Why is it so important to you that I and others know what you think? Since you are (usually) a reasonable person I don't need to read your explicit pronouncement to assume that you disagree with some repugnant post. You are assuming we all agree on what is repugnant. That pretty much demonstrates that you have missed my point. Without drawing explicit boundaries, how do people know what we consider beyond the boundary of acceptable behaviour? The people in this forum come from all over the world. We're not all white, middle-class[2], Australian, educated, progressive/liberals like me. We're black, Chinese, German, conservative, Muslim, Christian, atheist, socialist, anarchist, fascist, etc. We come from all sorts of cultures, where families are run like democracies, or where they are run like dictatorships where the father is the head of the household even of his adult children; cultures that consider euthanasia beyond the pale and those that believe that there are fates worse than death; cultures where smacking children is an abomination and cultures where it is simply common sense; cultures that condone honour-killings and those that don't; cultures where blowing yourself up to kill the enemy is thought to be an act of bravery, and cultures where pushing a button to kill strangers a thousand miles away is thought to be an honourable act of military service. What on earth makes you think we would possibly agree on what posts are repugnant without talking about it? I'm sure that there are some people here -- and you might be one of them -- that consider my use of the word "dick" unacceptable. And others who consider dick a mild word and far less offensive than the euphemisms others might prefer. Your opinion that we should all, somehow, agree on acceptable behaviour is culturally self-centred and rather naive. I'm far more offended by Dwight's habit of posting incoherently while pissed[3] than I am by his possibly-or-possibly-not racist punning. But I don't expect everyone to agree with me. [1] However, we can both be wrong. There's no reason to think that there is *any* strategy to respond to bad behaviour that will work all the time, against all people. [2] Nearly everybody thinks they're middle-class, except the filthy rich and the filthy poor. [3] I don't give a damn what mind-altering chemicals Dwight wishes to indulge in, so long as he does it in private. -- Steven -- http://mail.python.org/mailman/listinfo/python-list Bravo!...Encore, Encore!!! -- This message is NOT encrypted Mr. Kristen J. Webb Chief Technology Officer Teradactyl LLC. 2301 Yale Blvd. SE. Suite C7 Albuquerque, NM 87106 Phone: 1-505-338-6000 Email: kw...@teradactyl.com Web: http://www.teradactyl.com Home of the True incremental Backup System NOTICE TO RECIPIENTS: Any information contained in or attached to this message is intended solely for the use of the intended recipient(s). If you are not the intended recipient of this transmittal, you are hereby notified that you received this transmittal in error, and we request that you please delete and destroy all copies and attachments in your possession, notify the sender that you have received this communication in error, and note that any review or dissemination of, or the taking of any action in reliance on, this communication is
shipping python
I am new to python coming from the C/shell side. We have been experimenting with some code samples and now I'm looking at some command line argument processing. I find getopt older optparse new in 2.3 argparse new in 2.7 I search around on some of my client systems and find lots of people in the 2.4 - 2.6 range. After some more digging I see that I can easy_install argparse on my development system. My question is will I be able to ship this to a customer? Can I create .pyc files so that the customer does not have to install the argparse module? If not, and I want to go back into the 2.3+ range, should I just use optparse? I guess what I am asking here is are there any guidelines/recommendations for shipping python programs to customers? Thanks in advance, Kris -- Mr. Kristen J. Webb Teradactyl LLC. PHONE: 1-505-242-1091 EMAIL: kw...@teradactyl.com VISIT: http://www.teradactyl.com Home of the True incremental Backup System -- http://mail.python.org/mailman/listinfo/python-list
Re: shipping python
I tried experimenting with .pyc files only to end up at: RuntimeError: Bad magic number in .pyc file can't run 2.5 pyc files on 2.6 :( My main motivation to use .pyc is to keep end users from changing scripts, breaking things, and then calling us. Tamper proofing may be an alternative approach if anyone has suggestions. Otherwise, trying to summarize my goals: 1. Distribute python (and other stuff) across many platforms (Linux, UNIXes, OSX, Windows) 2. Support the current 2.X version of python installed on the system 3. Take advantage of python modules that use shared OS libraries (e.g. libssl.so.whatever) 4. For linux especially, support many distributions/versions (getting openssl to work right, for example, is a tricky problem) 5. Take advantage of the latest python modules whenever possible (hence the argparse testing). I realize that I may be able to go back so far for this to make sense... 6. Provide additional product functionality through our own shared libraries (c code). I'm assuming that the customer system has python 2.X installed, otherwise they can use their favorite OS method to get it in the standard way. Looking at methods that try to package and run without python installed at all do not look appealing, anywhere from does it work, to export issues, to needing a C compiler on the client system. Shipping .py files and support for modules like argparse for backward compatibility is what I've come up with so far. Then they have everything I need to create and install a .pyc file. (The can modify the installer .py files, but I expect this to be less of an issue and may be able to make my own simple tamper detecting for this). Can anyone suggest better strategies, or point out where this just won't work? Is distutils a good starting point? Many thanks! Kris On 10/11/11 7:31 PM, Steven D'Aprano wrote: On Tue, 11 Oct 2011 17:04:45 -0600, Kristen J. Webb wrote: After some more digging I see that I can easy_install argparse on my development system. My question is will I be able to ship this to a customer? Can I create .pyc files so that the customer does not have to install the argparse module? Yes, and yes. The licence of argparse is a very liberal licence, so you can just include it in your application. There's no need for the user to install it separately. You could include just the .pyc file if you insist, but I personally don't like or recommend .pyc only installations. If not, and I want to go back into the 2.3+ range, should I just use optparse? That depends on how complex your command line arguments are. -- Mr. Kristen J. Webb Teradactyl LLC. PHONE: 1-505-242-1091 EMAIL: kw...@teradactyl.com VISIT: http://www.teradactyl.com Home of the True incremental Backup System -- http://mail.python.org/mailman/listinfo/python-list
Re: shipping python
On 10/12/11 6:02 PM, Andrea Crotti wrote: Why do you want to use the system python and system libraries? It is a standard, just like glibc on linux, I'd like my code should work on the OS with minimal intrusion. If you want to avoid too much troubles and compatibility hell maybe give PyInstaller a try, you ship just one big executable and you're done. But apart from that setuptools is very good to know. What about Solaris, NetBSD, FreeBSD, etc, etc. If the executable includes bits from the openssl library, what about export restrictions? I'll take a look at setuptools, thanks. And also the world is a funny place, but does it really happen that a customer changes the code in your python scripts, and the *complain* if it doens't work anymore?? Yes, support costs with very knowledgeable clients is a very important factor. Thank you for the feedback! K -- Mr. Kristen J. Webb Teradactyl LLC. PHONE: 1-505-242-1091 EMAIL: kw...@teradactyl.com VISIT: http://www.teradactyl.com Home of the True incremental Backup System -- http://mail.python.org/mailman/listinfo/python-list
Re: shipping python
On 10/12/11 3:26 PM, Chris Angelico wrote: On Thu, Oct 13, 2011 at 8:10 AM, Kristen J. Webb wrote: My main motivation to use .pyc is to keep end users from changing scripts, breaking things, and then calling us. Tamper proofing may be an alternative approach if anyone has suggestions. I wouldn't bother; if you're worried about that, try a tamper-evident system rather than tamper-proof - for instance, MD5 checksums of everything: $ md5sum *>checksum.txt $ md5sum checksum.txt 123412341234123412341234 md5sum Save that meta-checksum and have an easy way to read it back - that way, you can be sure they haven't just rebuilt the checksum file. If that one checksum has changed, you know something else has; to find out which: $ md5sum -c --quiet checksum.txt No need to restrict what you send out that way, and you can still get a guarantee that they haven't fiddled with anything. ChrisA So you could think of the meta-checksum as a script wide version control of what is installed. Then, at key entry points, take the hit and re-generate the meta-checksum and compare. If bad, you have a major version control error, do not process further. Makes sense, so long as the user does not bother to regenerate the meta-checksum as well. Would be more extensible if in debugging, users can disable this feature. or have a tool that updates the meta-checksum so that they can run one-off code to fix problems. Oddly, this feature would make it easier to change code and still keep things running. But we could use the value in the support chain to say, "something changed, what's going on?". Thoughts? K -- Mr. Kristen J. Webb Teradactyl LLC. PHONE: 1-505-242-1091 EMAIL: kw...@teradactyl.com VISIT: http://www.teradactyl.com Home of the True incremental Backup System -- http://mail.python.org/mailman/listinfo/python-list
ssl module with C
Hi All, I'm hoping that the answer to this question will shed light on the Python/C interface and make me a much better python programer. I have a test TLS connection program in python (very breif) import socket, ssl news=socket.socket() news.connect() new_ssl=ssl.wrap_socket() new_ssl.read()/new_ssl.write() I'd like to pass my new_ssl to a C .so library so that I can SSL_read()/SSL_write. Why? Using the python/ssl interface gets me around so many issues with varies Linux distros as libssl.so is so unstandard. My idea is that using the installed python helps me to separte my own work-horse C code from the native openssl library. Can this be done? If not, the why should make me a better python programer! Many thanks in advance! Kris -- Mr. Kristen J. Webb Teradactyl LLC. PHONE: 1-505-242-1091 EMAIL: kw...@teradactyl.com VISIT: http://www.teradactyl.com Home of the True incremental Backup System -- http://mail.python.org/mailman/listinfo/python-list
