round decimal values
Hi, this code generate 4 values with gaussian distribution (mu=5, sigma=1): import numpy as np x = np.random.normal(5, 1, 4) print(x) Output: [5.87879753 3.29162433 3.83024698 4.92997148] I would like to round the output like this: [6, 3, 4, 5] What should I add to the code? Thank you j. -- https://mail.python.org/mailman/listinfo/python-list
Re: round decimal values
Il Thu, 24 Jun 2021 18:07:07 +0200, Julio Di Egidio ha scritto: > On 24/06/2021 16:23, jo wrote: >> Hi, >> >> this code generate 4 values with gaussian distribution (mu=5, sigma=1): >> >> import numpy as np x = np.random.normal(5, 1, 4) >> print(x) >> >> Output: >> [5.87879753 3.29162433 3.83024698 4.92997148] >> >> I would like to round the output like this: >> >> [6, 3, 4, 5] >> >> What should I add to the code? >> >> Thank you > > Have a look at numpy.around: > <https://numpy.org/doc/stable/reference/generated/numpy.around.html> > > HTH, > > Julio Yes, np.around() works fine. Thank you. This is the new code: import numpy as np x = np.random.normal(5, 1, 4) y=np.around(x) print(x) print(y) output: [4.68551569 3.9610641 6.1119447 4.81012246] [5. 4. 6. 5.] Thank you very much, j. -- https://mail.python.org/mailman/listinfo/python-list
[issue40538] struct.calcsize('L')== 8 but 4 is specified in documentation
Change by Jo King :
--
nosy: JoKing
priority: normal
severity: normal
status: open
title: struct.calcsize('L')== 8 but 4 is specified in documentation
type: behavior
versions: Python 3.6
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[issue37612] os.link(..., follow_symlinks=True) broken on Linux
Change by Jo Henke : -- keywords: +patch pull_requests: +14634 stage: -> patch review pull_request: https://github.com/python/cpython/pull/14843 ___ Python tracker <https://bugs.python.org/issue37612> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37612] os.link(..., follow_symlinks=True) broken on Linux
Jo Henke added the comment: The problem that POSIX does not define the behavior of link() regarding symlinks (and that Unix implementations differ indeed), is independent from Python's os.link() defaults. Since it makes no sense to call link(), when linkat() is available, I propose this change: --- a/Modules/posixmodule.c +++ b/Modules/posixmodule.c @@ -3512,15 +3512,11 @@ os_link_impl(PyObject *module, path_t *src, path_t *dst, int src_dir_fd, #else Py_BEGIN_ALLOW_THREADS #ifdef HAVE_LINKAT -if ((src_dir_fd != DEFAULT_DIR_FD) || -(dst_dir_fd != DEFAULT_DIR_FD) || -(!follow_symlinks)) -result = linkat(src_dir_fd, src->narrow, -dst_dir_fd, dst->narrow, -follow_symlinks ? AT_SYMLINK_FOLLOW : 0); -else +result = linkat(src_dir_fd, src->narrow, dst_dir_fd, dst->narrow, +follow_symlinks ? AT_SYMLINK_FOLLOW : 0); +#else +result = link(src->narrow, dst->narrow); #endif /* HAVE_LINKAT */ -result = link(src->narrow, dst->narrow); Py_END_ALLOW_THREADS if (result) This fix also simplifies the code, and should be safe for back-porting. Whether Python's defaults should be changed regarding Windows and those (mostly obsolete) Unix platforms that do not provide linkat(), is another question. -- ___ Python tracker <https://bugs.python.org/issue37612> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37612] os.link(..., follow_symlinks=True) broken on Linux
New submission from Jo Henke :
Regarding link() POSIX states
(https://pubs.opengroup.org/onlinepubs/9699919799/functions/link.html):
"If path1 names a symbolic link, it is implementation-defined whether link()
follows the symbolic link, or creates a new link to the symbolic link itself."
In Linux, link() does _not_ follow symlinks
(http://man7.org/linux/man-pages/man2/link.2.html):
"By default, linkat(), does not dereference oldpath if it is a symbolic link
(like link())."
But Python 3 assumes the opposite to be always the case:
https://github.com/python/cpython/blob/8cb65d1381b027f0b09ee36bfed7f35bb4dec9a9/Modules/posixmodule.c#L3517
...which suits e.g. NetBSD (https://netbsd.gw.com/cgi-bin/man-cgi?link+2):
"When operating on a symlink, link() resolves the symlink and creates a hard
link on the target."
Therefore, I recommend to always call linkat(), if the platform provides it.
That's the modern superset of link() with clearly defined behavior.
Here are some commands to reproduce the issue on Linux (should hard link 'file'
-> 'link', but tries '/tmp/symlink' -> 'link'):
~$ : >file
~$ ln -s "$PWD/file" /tmp/symlink
~$ strace -e link,linkat python -c 'import os; os.link("/tmp/symlink", "link",
follow_symlinks=True)'
link("/tmp/symlink", "link")= -1 EXDEV (Cross-device link)
Traceback (most recent call last):
File "", line 1, in
OSError: [Errno 18] Cross-device link: '/tmp/symlink' -> 'link'
+++ exited with 1 +++
For comparison, calling linkat() without AT_SYMLINK_FOLLOW results in the same
error:
~$ strace -e link,linkat python -c 'import os; os.link("/tmp/symlink", "link",
follow_symlinks=False)'
linkat(AT_FDCWD, "/tmp/symlink", AT_FDCWD, "link", 0) = -1 EXDEV (Cross-device
link)
Traceback (most recent call last):
File "", line 1, in
OSError: [Errno 18] Cross-device link: '/tmp/symlink' -> 'link'
+++ exited with 1 +++
Currently, the only way to call linkat() with AT_SYMLINK_FOLLOW from Python, is
to provide a directory file descriptor != AT_FDCWD:
~$ strace -e link,linkat python -c 'import os; d=os.open(".", 0);
os.link("/tmp/symlink", "link", dst_dir_fd=d, follow_symlinks=True)'
linkat(AT_FDCWD, "/tmp/symlink", 3, "link", AT_SYMLINK_FOLLOW) = 0
+++ exited with 0 +++
--
components: Library (Lib)
messages: 348086
nosy: jo-he
priority: normal
severity: normal
status: open
title: os.link(..., follow_symlinks=True) broken on Linux
type: behavior
versions: Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9
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How to use Pycharm to display the stack and heap python?
I am new to programming. Difficult for me to understand code using http://www.pythontutor.com/visualize.html#. How to use Pycharm to display the stack and heap python? -- https://mail.python.org/mailman/listinfo/python-list
Is there a OrderedDict which can perform an iteritems() in order?
Hello all, I have working on a program which need a ordered dictionary that could perform iteritems() sequentially. I found a package on : http://www.voidspace.org.uk/python/odict.html#creating-an-ordered-dictionary http://www.voidspace.org.uk/python/odict.html#creating-an-ordered-dictionary but it could only perform items() in order, but iteritems()... Would you help me here? songjian 11.4 -- -- Best Regards 陈松坚 信息科学与技术学院 中山大学 广州大学城 510006 Chen Songjian School of Information Science Technology Sun Yat-sen(Zhongshan) University, Guangzhou Higher Education Mega Center, China, 510006 Mobile: +86-137-6069-6137 Email: csj...@gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Google job leads
Dear Colleagues, I recently started a recruiter project at Google and am working with Partner Solutions Organization and recruiting Technical Account Managers for the group so I am actively networking with those who may know great software engineers with client-facing experience (or wanting to move in that direction) for career-defining opportunities. If there are individuals and organizations that I should reach out to, please do let me know -- my office contact information is below. Google office: Charles Jo Sales Recruiter, Google 650.253.0375 office 408.668.4226 cell charle...@google.com Feedback is always welcome! Best, Charles -- Message sent by: Charles Jo 408.668.4226 charl...@sonic.net http://bit.ly/zooqdesk http://www.linkedin.com/in/charlesjo http://twitter.com/charlesjo http://www.facebook.com/profile.php?id=603461791 -- http://mail.python.org/mailman/listinfo/python-list
Hi, friends. I wanna ask if there is a function which is able to take a list as argument and then return its top-k maximums?
Hi,friends. I wanna ask if there is a function which is able to take a list as argument and then return its top-k maximums? I only know about max which is poorly a top-1 maximum function, now I want more yet I am lazy enough that don't want to write one by myself. So please tell me if there is one or not. I really need this soon. Appreciate a lot. -- -- Best Regards 陈松坚 信息科学与技术学院 中山大学 广州大学城 510006 Chen Songjian School of Information Science Technology Sun Yat-sen(Zhongshan) University, Guangzhou Higher Education Mega Center, China, 510006 Mobile: +86-137-6069-6137 Email: csj...@gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Hi, friends. I wanna ask if there is a function which is able to take a list as argument and then return its top-k maximums?
Cool! Thanks a lot! That's exactly what I want. Best regards, Songjian On Thu, Apr 22, 2010 at 10:04 PM, Chris Rebert creb...@ucsd.edu wrote: 2010/4/22 Jo Chan csj...@gmail.com: Hi,friends. I wanna ask if there is a function which is able to take a list as argument and then return its top-k maximums? I only know about max which is poorly a top-1 maximum function, now I want more yet I am lazy enough that don't want to write one by myself. http://docs.python.org/library/heapq.html#heapq.nlargest Cheers, Chris -- http://blog.rebertia.com -- -- Best Regards 陈松坚 信息科学与技术学院 中山大学 广州大学城 510006 Chen Songjian School of Information Science Technology Sun Yat-sen(Zhongshan) University, Guangzhou Higher Education Mega Center, China, 510006 Mobile: +86-137-6069-6137 Email: csj...@gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Hi, friends. I wanna ask if there is a function which is able to take a list as argument and then return its top-k maximums?
Yeah... but actually I need something more efficient, like heap. Thank you for your help though. Best regards, Songjian On Thu, Apr 22, 2010 at 10:04 PM, Tim Golden m...@timgolden.me.uk wrote: On 22/04/2010 14:57, Jo Chan wrote: Hi,friends. I wanna ask if there is a function which is able to take a list as argument and then return its top-k maximums? I only know about max which is poorly a top-1 maximum function, now I want more yet I am lazy enough that don't want to write one by myself. So please tell me if there is one or not. I really need this soon. Appreciate a lot. Assuming top-k doesn't mean something obscurely statistical: l = [1,2, 3, 4, 5] k = 3 print (sorted (l, reverse=True)[:k]) TJG -- http://mail.python.org/mailman/listinfo/python-list -- -- Best Regards 陈松坚 信息科学与技术学院 中山大学 广州大学城 510006 Chen Songjian School of Information Science Technology Sun Yat-sen(Zhongshan) University, Guangzhou Higher Education Mega Center, China, 510006 Mobile: +86-137-6069-6137 Email: csj...@gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Hi,Everyone: what's the most popular xml parser module on python?
Hi, everyone~~~ I am new. What is the most popular xml parser module used on python? Thanks for answering... -- -- Best Regards 陈松坚 信息科学与技术学院 中山大学 广州大学城 510006 Chen Songjian School of Information Science Technology Sun Yat-sen(Zhongshan) University, Guangzhou Higher Education Mega Center, China, 510006 Mobile: +86-137-6069-6137 Email: csj...@gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Hi, Everyone: what's the most popular xml parser module on python?
On Thu, Apr 15, 2010 at 6:52 PM, Stefan Behnel stefan...@behnel.de wrote: Jo Chan, 15.04.2010 10:52: I just want to get the content from a XML. That's not a very specific description of what you want to do. What's the content? The plain text content? Or do you care about the structure? And what parts of the structure? I learn that there are two modules in python handling XML.(SAX and DOM) Er, I just want to know if there is some open source tools for handling XML which is easier to use or has more powerful function. Try xml.etree.ElementTree, it's certainly much easier to use than the two above, and it's also in the stdlib. If you need more powerful features, take a look at lxml.etree, which is a (mostly) compatible external package. By the way, besidesDiving into python is there any great book for learning python? That has been answered many times on this list. Check the archives, or look through the book references at http://wiki.python.org Stefan -- http://mail.python.org/mailman/listinfo/python-list -- -- Best Regards 陈松坚 信息科学与技术学院 中山大学 广州大学城 510006 Chen Songjian School of Information Science Technology Sun Yat-sen(Zhongshan) University, Guangzhou Higher Education Mega Center, China, 510006 Mobile: +86-137-6069-6137 Email: csj...@gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Hi, Everyone: what's the most popular xml parser module on python?
I want to say I just have to deal with some regular text input (the input file is as XML format) so I need to read all the nodes out and get what they are. Thanks for your great help though. I should have made my point clearer. :) On Thu, Apr 15, 2010 at 6:52 PM, Stefan Behnel stefan...@behnel.de wrote: Jo Chan, 15.04.2010 10:52: I just want to get the content from a XML. That's not a very specific description of what you want to do. What's the content? The plain text content? Or do you care about the structure? And what parts of the structure? I learn that there are two modules in python handling XML.(SAX and DOM) Er, I just want to know if there is some open source tools for handling XML which is easier to use or has more powerful function. Try xml.etree.ElementTree, it's certainly much easier to use than the two above, and it's also in the stdlib. If you need more powerful features, take a look at lxml.etree, which is a (mostly) compatible external package. By the way, besidesDiving into python is there any great book for learning python? That has been answered many times on this list. Check the archives, or look through the book references at http://wiki.python.org Stefan -- http://mail.python.org/mailman/listinfo/python-list -- -- Best Regards 陈松坚 信息科学与技术学院 中山大学 广州大学城 510006 Chen Songjian School of Information Science Technology Sun Yat-sen(Zhongshan) University, Guangzhou Higher Education Mega Center, China, 510006 Mobile: +86-137-6069-6137 Email: csj...@gmail.com -- http://mail.python.org/mailman/listinfo/python-list
starting selenium rc server from python code
Hi, Is there anyway to start the selenium rc server within python code? Thank you Jo -- http://mail.python.org/mailman/listinfo/python-list
need help with an egg
Hi,
I am very new to python
I created an egg on a machine. The Python version on that is 2.5.
Copied that egg to a machine which has Python 2.6.
unzip -t Myproj-0.1-py2.5.egg
The above command shows all the files I need
When I run the easy_install, I get the foll. error. Is it because of
the version? Or am I doing something wrong? Or the way I understand
the egg works is wrong. Can anyone please help?
If it's the version issue, does that mean I cannot use that egg on my
machine with 2.6 version?
Installed /usr/local/lib/python2.6/dist-packages/Myproj-0.1-py2.5.egg
Processing dependencies for Myproj==0.1
Searching for Myproj==0.1
Reading http://pypi.python.org/simple/Myproj/
Couldn't find index page for 'Myproj' (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading http://pypi.python.org/simple/
No local packages or download links found for Myproj==0.1
error: Could not find suitable distribution for Requirement.parse
('Myproj==0.1')
Thank you
Jo
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Record Audio Analysis
I would like to record audio from a mic and perform some basic analysis on the audio wave patterns produced. What would be the easiest way to accomplish this in Python? -- http://mail.python.org/mailman/listinfo/python-list
how do i use tkinter.createfilehandler with a regular c program?
I am trying to write a GUI with tkinter that displays the stdout from a
regular C/C++ program in a text widget.
The idea i was trying to use was as follows:
1) use popen to execute the C/C++ program
2) then use tkinter.createfilehandler to create a callback that would
be called when the C/C++ program creates output on stdout.
Somehow, I can't get this to work. here is what I have tried so far:
import sys,os
from Tkinter import *
root = Tk()
mainFrame = Frame(root)
textBox = Text(mainFrame)
textBox.pack(fill=BOTH, expand=YES)
mainFrame.pack(fill=BOTH, expand=YES)
fh = os.popen('/homes/jschamba/tof/pcan/pcanloop')
def readfh(filehandle, stateMask):
global textBox
newText = filehandle.read()
textBox.insert(END, newText)
tkinter.createfilehandler(fh, tkinter.READABLE, readfh)
root.mainloop()
I don't see any of the stdout from my program appear in the textbox.
Does anyone have a short example that I could use as an inspiration for
this task?
I guess what my ultimate goal would be is to create something similar to
the expectk call expect_background, which does exactly what i just
described, i.e. wait for output from a shell/C/C++ program and then do
something in response to this output like insert it into a text widget.
In expect, the following program seems to work:
#!/usr/bin/expectk -f
# disable terminal output
log_user 0
spawn -noecho /homes/jschamba/tof/pcan/pcanloop
set shell $spawn_id
text .shell -relief sunken -bd 1 -width 90 -height 24 -yscrollcommand
{.scroll set}
scrollbar .scroll -command {.shell yview}
pack .scroll -side right -fill y
pack .shell -side bottom -expand true -fill both
expect_background {
-i $shell -re \[^\x0d]+ {
.shell insert end $expect_out(0,string)
.shell yview -pickplace insert
}
}
Jo
--
Dr Joachim Schambach
The University of Texas at Austin
Department of Physics
1 University Station C1600
Austin, Texas 78712-0264, USA
Phone: (512) 471-1303; FAX: (814) 295-5111
e-mail: [EMAIL PROTECTED]
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Re: how do i use tkinter.createfilehandler with a regular c program?
Thanks, that seems to work.
maybe one more question on this subject:
how can i use the callback function to the createfilehandler call from
within a class?
in other words, what would be the signature of the callback function, if
I made it a member of a class?
The documentation says that the callback is called with the arguments:
callback(filehandle, stateMask)
but a class member function always has the self argument as is first
argument. So would the syntax be:
class GUI:
def __init__:
.
def filehandlerCallback(self, filehandle, stateMask):
Jo
[EMAIL PROTECTED] wrote:
Compared to your program, I
* Made sure that the slave program actually flushed its stdout buffers
* didn't call read(), which will by default continue reading until
it reaches EOF, not merely read the available data
#!/usr/bin/env python
import sys, time, Tkinter, itertools, _tkinter, os
if '-slave' in sys.argv:
for i in itertools.count():
time.sleep(1)
print This is a line of output:, i
sys.stdout.flush()
raise SystemExit
root = Tkinter.Tk()
root.wm_withdraw()
fh = os.popen('%s -slave' % sys.argv[0])
def reader(*args):
line = fh.readline()
if not line:
print EOF from slave
raise SystemExit
print from slave: %r % line
_tkinter.createfilehandler(fh, Tkinter.READABLE, reader)
root.mainloop()
--
Dr Joachim Schambach
The University of Texas at Austin
Department of Physics
1 University Station C1600
Austin, Texas 78712-0264, USA
Phone: (512) 471-1303; FAX: (814) 295-5111
e-mail: [EMAIL PROTECTED]
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array of Tkinter variables?
I want to build an array of entry widgets in python with Tkinter that
all have similar textvariables. I was hoping that I could use an array
of StringVar variables to attach to these widgets, so that I can loop
through the widget creation. But my simple minded approach failed:
for i in range(32):
self.dllAdjust[i] = StringVar()
self.dllAdjust[i].set('000')
gives me the following error:
File ./config.py, line 787, in setDefaultVals
self.dllAdjust[i] = StringVar()
AttributeError: Configurator instance has no attribute 'dllAdjust'
(Configurator is the class in which this code fragment appears)
How does one define an array of StringVar? If that is not possible, what
would be an alternative approach to the idea in the code fragment above?
Jo
--
Dr Joachim Schambach
The University of Texas at Austin
Department of Physics
1 University Station C1600
Austin, Texas 78712-0264, USA
Phone: (512) 471-1303; FAX: (814) 295-5111
e-mail: [EMAIL PROTECTED]
--
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sys.exit call from pythonw.exe gives error
I wrote a python GUI with tkInter and installed it on a windows machine with the .pyw extension, so it will be executed from pythonw.exe instead of python.exe, since I didn't want the console window to appear. My application exits with a call to sys.exit. However, when this call is executed under pythonw.exe I get an error popup window with the following messeage: start quote Microsoft Visual C++ Runtime Library Runtime Error! Program: C:\Python24\pythonw.exe This application has requested the Runtime to terminate in an unusual way. Please contact the application support team for more information end quote What am I doint wrong here? Jo -- Dr Joachim Schambach The University of Texas at Austin Department of Physics 1 University Station C1600 Austin, Texas 78712-0264, USA Phone: (512) 471-1303; FAX: (814) 295-5111 e-mail: [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
