Re: Why Python has no equivalent of JDBC of Java?
On 2019-05-19, Marco Sulla wrote: >blablabla >blablablalbla >blablalblalbalblabla There's no perfect language mate, in some one is easier in other not, normal surprised you notice it so late. -- https://mail.python.org/mailman/listinfo/python-list
Re: Implementing C++'s getch() in Python
I've run getpass() on IDLE, Spyder, PyCharm and Mu. All with negative results. -- https://mail.python.org/mailman/listinfo/python-list
How to use ssh-agent in windows in python?
Hi,
I am using cygwin on Windows 8.1. These two commands work fine in cygwin:
ssh-agent -s
ssh-add ~/.ssh /id_rsa
I tried to use them on windows cmd and it worked fine. Now I am going
to use python to write code to implement the above command.
os.system('ssh-agent -s')
os.system('ssh-add id_rsa')
There was an error:
Could not open a connection to your authentication agent.
Thank you and your time.
--
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Re: Implementing C++'s getch() in Python
On Sun, 26 May 2019 at 20:23, wrote: > > I've run getpass() on IDLE, Spyder, PyCharm and Mu. All with negative results. > > As Random832 pointed out, these IDEs cannot handle the stdout/stdin with getpass You should use a normal terminal (command prompt) on your windows for running this program. You can read more here, https://docs.python.org/3.1/library/getpass.html -- https://mail.python.org/mailman/listinfo/python-list
Re: Implementing C++'s getch() in Python
On 5/25/19, Paul Moore wrote: > > On Windows, the msvcrt module exposes getch: > https://docs.python.org/3.7/library/msvcrt.html#msvcrt.getch I suggest using msvcrt.getwch instead of msvcrt.getch. Both functions are limited to the basic multilingual plane (BMP, i.e. U+ -- U+), but getch is additionally limited to the console input codepage. In Windows, getpass.getpass is based on msvcrt.getwch and msvcrt.putwch. If you use getch and need the full BMP range, you can temporarily change the console input codepage to UTF-8 (65001). It's a multibyte encoding (i.e. 1-3 bytes per BMP code), so the initial getch call has to be followed by a loop that calls it again while the sequence can't be decoded and kbhit() is true. -- https://mail.python.org/mailman/listinfo/python-list
Re: How to use ssh-agent in windows in python?
On 2019-05-26 15:55, Fc Zwtyds wrote:
Hi,
I am using cygwin on Windows 8.1. These two commands work fine in cygwin:
ssh-agent -s
ssh-add ~/.ssh /id_rsa
I tried to use them on windows cmd and it worked fine. Now I am going
to use python to write code to implement the above command.
os.system('ssh-agent -s')
os.system('ssh-add id_rsa')
There was an error:
Could not open a connection to your authentication agent.
Thank you and your time.
The string that you passed to the second os.system differs from the
second command on the command line. Is that the cause?
--
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Re: Why Python has no equivalent of JDBC of Java?
Am 21.05.19 um 14:27 schrieb Adriaan Renting: Java was meant to be generic, run anywhere and abstract and hide differences in its underlying infrastructure. This has led to the Java VM, and also JDBC I guess. Python was more of a script interpreted C-derivative, much closer to the bare metal, and thus much less effort was made to hide and abstract. Python closer to the metal than Java? This is nonsense. It is exactly the opposite. As a simple empirical proof, there are compilers which compile Java to native code (gcj) with comparable performance than C code, while such a thing is almost not doable for Python, only for restricted subsets. Java code can be "manually compiled" into C++ code with only a few tweaks, most notably you need a garbage collector, but that's it - apart from a huge library, maybe. Python code with dynamic typing cannot be statically compiled in the same way, which you pay for by a factor of 100 in execution speed. Christian -- https://mail.python.org/mailman/listinfo/python-list
Re: More CPUs doen't equal more speed
On 2019-05-23, Chris Angelico wrote: > On Fri, May 24, 2019 at 5:37 AM Bob van der Poel wrote: >> >> I've got a short script that loops though a number of files and >> processes them one at a time. I had a bit of time today and figured >> I'd rewrite the script to process the files 4 at a time by using 4 >> different instances of python. My basic loop is: >> >> for i in range(0, len(filelist), CPU_COUNT): >> for z in range(i, i+CPU_COUNT): >> doit( filelist[z]) >> >> With the function doit() calling up the program to do the >> lifting. Setting CPU_COUNT to 1 or 5 (I have 6 cores) makes no >> difference in total speed. I'm processing about 1200 files and my >> total duration is around 2 minutes. No matter how many cores I use >> the total is within a 5 second range. > > Where's the part of the code that actually runs them across multiple > CPUs? Also, are you spending your time waiting on the disk, the CPU, > IPC, or something else? He said he's using N differenct Python instances, and he even provided the code that runs in each instance which is obviously processesing 1/Nth of the files. It's a pretty good bet that I/O is the limiting factor. -- Grant -- https://mail.python.org/mailman/listinfo/python-list
Re: More CPUs doen't equal more speed
On Mon, May 27, 2019 at 4:06 AM Grant Edwards wrote: > > On 2019-05-23, Chris Angelico wrote: > > On Fri, May 24, 2019 at 5:37 AM Bob van der Poel wrote: > >> > >> I've got a short script that loops though a number of files and > >> processes them one at a time. I had a bit of time today and figured > >> I'd rewrite the script to process the files 4 at a time by using 4 > >> different instances of python. My basic loop is: > >> > >> for i in range(0, len(filelist), CPU_COUNT): > >> for z in range(i, i+CPU_COUNT): > >> doit( filelist[z]) > >> > >> With the function doit() calling up the program to do the > >> lifting. Setting CPU_COUNT to 1 or 5 (I have 6 cores) makes no > >> difference in total speed. I'm processing about 1200 files and my > >> total duration is around 2 minutes. No matter how many cores I use > >> the total is within a 5 second range. > > > > Where's the part of the code that actually runs them across multiple > > CPUs? Also, are you spending your time waiting on the disk, the CPU, > > IPC, or something else? > > He said he's using N differenct Python instances, and he even provided > the code that runs in each instance which is obviously processesing > 1/Nth of the files. > > It's a pretty good bet that I/O is the limiting factor. > Sometimes, the "simple" and "obvious" code, the part that clearly has no bugs in it, is the part that has the problem. :) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: More CPUs doen't equal more speed
On 2019-05-26, Chris Angelico wrote: > Sometimes, the "simple" and "obvious" code, the part that clearly has > no bugs in it, is the part that has the problem. :) And in this case, the critical part of the code that was actually serializing everything wasn't shown. One strives to post problem descriptions that are as simple as possible, but in this case the description was even simpler than that. -- Grant -- https://mail.python.org/mailman/listinfo/python-list
Re: More CPUs doen't equal more speed
On Mon, May 27, 2019 at 4:24 AM Grant Edwards wrote: > > On 2019-05-26, Chris Angelico wrote: > > > Sometimes, the "simple" and "obvious" code, the part that clearly has > > no bugs in it, is the part that has the problem. :) > > And in this case, the critical part of the code that was actually > serializing everything wasn't shown. One strives to post problem > descriptions that are as simple as possible, but in this case the > description was even simpler than that. > Indeed, which is why I asked the question. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: More CPUs doen't equal more speed
On Sun, May 26, 2019 at 11:05 AM Grant Edwards wrote: > On 2019-05-23, Chris Angelico wrote: > > On Fri, May 24, 2019 at 5:37 AM Bob van der Poel > wrote: > >> > >> I've got a short script that loops though a number of files and > >> processes them one at a time. I had a bit of time today and figured > >> I'd rewrite the script to process the files 4 at a time by using 4 > >> different instances of python. My basic loop is: > >> > >> for i in range(0, len(filelist), CPU_COUNT): > >> for z in range(i, i+CPU_COUNT): > >> doit( filelist[z]) > >> > >> With the function doit() calling up the program to do the > >> lifting. Setting CPU_COUNT to 1 or 5 (I have 6 cores) makes no > >> difference in total speed. I'm processing about 1200 files and my > >> total duration is around 2 minutes. No matter how many cores I use > >> the total is within a 5 second range. > > > > Where's the part of the code that actually runs them across multiple > > CPUs? Also, are you spending your time waiting on the disk, the CPU, > > IPC, or something else? > > He said he's using N differenct Python instances, and he even provided > the code that runs in each instance which is obviously processesing > 1/Nth of the files. > > It's a pretty good bet that I/O is the limiting factor. > > I did say that ... I also retracted it. In my first eg. I was still running one process at a time ... no multi-task at all. Parallel is up and running and is very, very fast ... loads my CPUs to 100% > > > > -- > https://mail.python.org/mailman/listinfo/python-list > -- Listen to my FREE CD at http://www.mellowood.ca/music/cedars Bob van der Poel ** Wynndel, British Columbia, CANADA ** EMAIL: b...@mellowood.ca WWW: http://www.mellowood.ca -- https://mail.python.org/mailman/listinfo/python-list
Re: How to use ssh-agent in windows in python?
On 26May2019 22:55, Fc Zwtyds wrote:
I am using cygwin on Windows 8.1. These two commands work fine in
cygwin:
ssh-agent -s
ssh-add ~/.ssh /id_rsa
No, they run without error (apparently). That is an entirely different
thing.
In particular, "ssh-agent -s" starts an agent but unless you make use of
its output, your subsequent commands will have no idea how to access it.
Since ssh-add (apparently) works, then I would guess you _already_ had
an agent, and it is adding to that agent's keys. And, importantly,
_ignoring_ the new agent you started.
Try running your commands above again, but _before_ them, run "ssh-add
-l". If that works then there's already an agent known to the shell and
your subsequent "ssh-add" is likely adding to that, not to the new agent
you dispatched.
I tried to use them on windows cmd and it worked fine. Now I am
going to use python to write code to implement the above command.
os.system('ssh-agent -s')
os.system('ssh-add id_rsa')
There was an error:
Could not open a connection to your authentication agent.
I'm presuming that as with UNIXy systems, os.system() on Windows issues
its commands to a distinct shell ( instance of cmd.exe or the like).
As such, since you've made no effort to catch and parse the output of
"ssh-agent -s" you don't know how to talk to the agent you started, and
further since you don't pass any information to the shell running
"ssh-add" then it doesn't know how to do that either.
Cheers,
Cameron Simpson
--
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Re: How to use ssh-agent in windows in python?
在 2019-05-27 0:27, MRAB 写道:
On 2019-05-26 15:55, Fc Zwtyds wrote:
Hi,
I am using cygwin on Windows 8.1. These two commands work fine in
cygwin:
ssh-agent -s
ssh-add ~/.ssh /id_rsa
I tried to use them on windows cmd and it worked fine. Now I am going
to use python to write code to implement the above command.
os.system('ssh-agent -s')
os.system('ssh-add id_rsa')
There was an error:
Could not open a connection to your authentication agent.
Thank you and your time.
The string that you passed to the second os.system differs from the
second command on the command line. Is that the cause?
Hi,
At the beginning string is like this
ssh-add ~/.ssh/id_rsa
In order to facilitate the test, multiple quick input, I copied
id_rsa into the program directory, the string was changed to
ssh-add id_rsa
Whether in cygwin or cmd, manually entering these two commands will
execute correctly.
As far as I know, the problem seems to be that a subshell is opened
after 'ssh-agent -s' execution, and I don't know how to use python to
implement this process.
Thank you for your help
--
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Re: How to use ssh-agent in windows in python?
在 2019-05-27 7:13, Cameron Simpson 写道:
On 26May2019 22:55, Fc Zwtyds wrote:
I am using cygwin on Windows 8.1. These two commands work fine in
cygwin:
ssh-agent -s
ssh-add ~/.ssh /id_rsa
No, they run without error (apparently). That is an entirely different
thing.
In particular, "ssh-agent -s" starts an agent but unless you make use of
its output, your subsequent commands will have no idea how to access it.
Since ssh-add (apparently) works, then I would guess you _already_ had
an agent, and it is adding to that agent's keys. And, importantly,
_ignoring_ the new agent you started.
Try running your commands above again, but _before_ them, run "ssh-add
-l". If that works then there's already an agent known to the shell and
your subsequent "ssh-add" is likely adding to that, not to the new agent
you dispatched.
I tried to use them on windows cmd and it worked fine. Now I am going
to use python to write code to implement the above command.
os.system('ssh-agent -s')
os.system('ssh-add id_rsa')
There was an error:
Could not open a connection to your authentication agent.
I'm presuming that as with UNIXy systems, os.system() on Windows issues
its commands to a distinct shell ( instance of cmd.exe or the like).
As such, since you've made no effort to catch and parse the output of
"ssh-agent -s" you don't know how to talk to the agent you started, and
further since you don't pass any information to the shell running
"ssh-add" then it doesn't know how to do that either.
Cheers,
Cameron Simpson
Thank you very much for your detailed answer.
I will try to learn how to capture and parse the output of "ssh-agent
-s" and learn how to talk to the agent.
--
https://mail.python.org/mailman/listinfo/python-list
Re: How to use ssh-agent in windows in python?
On 27May2019 08:22, Fc Zwtyds wrote: Thank you very much for your detailed answer. I will try to learn how to capture and parse the output of "ssh-agent -s" and learn how to talk to the agent. The output of "ssh-agent -s" is Bourne shell variable assignment syntax. You need to parse that and then install those values in so.environ before calling the second command. The subprocess module has methods for collecting the output of a command (see the communicate method). Cheers, Cameron Simpson -- https://mail.python.org/mailman/listinfo/python-list
Undefined symbols for Mac OS 10.14.4 build
Hi, I’m trying to build CPython 3.8 from source on Mac OS 10.14.4 and running into undefined symbols problem at the linker stage.The commands I’m using are: ./configure --with-pydebug make -s -j2 The undefined symbols are listed below. I’ve found that if I modify pyconfig.h by changing #define HAVE_LIBINTL_H 1 to #undef HAVE_LIBINTL_H the build completes. This is my first time trying this so I’m not very familiar with the build process. It seems like I must be missing something since I don't think modifying pyconfig.h is a normal part of the process. Any suggestions? Thanks, Mark Undefined symbols for architecture x86_64: Undefined symbols for architecture x86_64: "_libintl_bindtextdomain", referenced from: "_libintl_bindtextdomain", referenced from: _PyIntl_bindtextdomain in libpython3.8d.a(_localemodule.o) _PyIntl_bindtextdomain in libpython3.8d.a(_localemodule.o) "_libintl_dcgettext", referenced from: "_libintl_dcgettext", referenced from: _PyIntl_dcgettext in libpython3.8d.a(_localemodule.o) _PyIntl_dcgettext in libpython3.8d.a(_localemodule.o) "_libintl_dgettext", referenced from: "_libintl_dgettext", referenced from: _PyIntl_dgettext in libpython3.8d.a(_localemodule.o) _PyIntl_dgettext in libpython3.8d.a(_localemodule.o) "_libintl_gettext", referenced from: "_libintl_gettext", referenced from: _PyIntl_gettext in libpython3.8d.a(_localemodule.o) _PyIntl_gettext in libpython3.8d.a(_localemodule.o) "_libintl_setlocale", referenced from: "_libintl_setlocale", referenced from: _PyLocale_setlocale in libpython3.8d.a(_localemodule.o) _PyLocale_setlocale in libpython3.8d.a(_localemodule.o) _locale_decode_monetary in libpython3.8d.a(_localemodule.o) _locale_decode_monetary in libpython3.8d.a(_localemodule.o) "_libintl_textdomain", referenced from: "_libintl_textdomain", referenced from: _PyIntl_textdomain in libpython3.8d.a(_localemodule.o) _PyIntl_textdomain in libpython3.8d.a(_localemodule.o) ld: symbol(s) not found for architecture x86_64 ld: symbol(s) not found for architecture x86_64 -- https://mail.python.org/mailman/listinfo/python-list
