A long time ago when I was working with Python and DLLs I slapped together
a basic and ugly example.
You can find it here: https://github.com/James-Chapman/python-code-snippets/
tree/master/DLL_C_funcs_w_callbacks
The whole thing should load into Visual Studio. I can't guarantee that it
works
Why has no one mentioned Github/Gitlab?
Set up a free account on either or both platforms, and start committing
your code. When applying for jobs potential employers will often want to
see what you're capable of even before inviting you for an interview, and
many will ask for a github page to see
Ah OK, now I understand why you mentioned pymalloc to begin with.
I'm not familiar with uWSGI or cython. That said, why do you think it's
uWSGI causing a leak? It seems unlikely.
Python projects can grow in size if you're not dereferencing objects...
(see
On 13 December 2017 at 18:30, Etienne Robillard <tkad...@yandex.com> wrote:
> Hi James,
>
> Thank for your reply. Are you suggesting that under Linux the malloc()
> glibc library call is more memory efficient than using pymalloc?
>
> Best regards,
>
> Etienne
>
>
Why pymalloc? I presume this means you're using ctypes which means I have
more questions.
If you're allocating your own blocks of memory then you need to free them
too. IE, does each call to pymalloc have a corresponding call to pyfree?
Is the overhead of pythons built in malloc really a
We're heading into advanced territory here and I might get told off but...
Consider this C++ program for a second, it has a struct with different
types of variables which sit next to each other in memory. When you print
the byte values of the struct, you can see that there is no easy way to
know
I should have re-read that last reply before hitting send. Apologies
for the poor sentence construction!
Something I forgot to highlight before which might be related to your
initial question.
If you have a file called sound.py which contained a class called
WavFile, if you imported just sound
May I suggest: https://docs.python.org/2/tutorial/modules.html
In particular:
* https://docs.python.org/2/tutorial/modules.html#the-module-search-path
* https://docs.python.org/2/tutorial/modules.html#packages
Now the next bit of advice is likely to be controversial but I have
good reasons for
>From one of the Python examples:
# COMPILING/INSTALLING THE DLIB PYTHON INTERFACE
# You can install dlib using the command:
# pip install dlib
#
# Alternatively, if you want to compile dlib yourself then go into the dlib
# root folder and run:
# python setup.py install
# or
#
If you read the comment that goes with the code snippet pasted in the
original email it makes far more sense as the author is talking
specifically about out of memory errors...
"You already got excellent answers, I just wanted to add one more tip
that's served me well over the years in a variety
Hi Richard
There are a number of considerations you need to take into account here.
Raw sockets is almost never the right solution, while a basic socket to
socket connection is easy enough to program, handling failure and
concurrency can very quickly make the solution a lot more complex than it
Long-ish reply, but please bear with me.
To quote the list description This list is for folks who want to ask
questions regarding how to learn computer programming with the Python
language and its standard library.
While MySQL modules are not part of the standard library, consider the
following
One of my pet hates about this list... This is a tutor list, your question
is out of scope. Sure there might be better places to seek answers, and
sure maybe the first responder doesn't know the answer, but that's not a
reason to respond with that phrase. This list is a called python tutor, not
Actually, it's more likely that the char you are grabbing is UTF-16 not
UTF-8 which is moving into the double byte...
* An assumption based on the following output:
u = u'\u2014'
s = u.encode(utf-16)
print(s)
■¶
s = u.encode(utf-32)
print(s)
■ ¶
s = u.encode(utf-16LE)
print(s)
¶
s =
I am trying to scrap text from a website using Python 2.7 in windows 8 and
i am getting this error ***UnicodeDecodeError: 'charmap codec can't encode
character u'\u2014 in position 11231 character maps to undefined*
For starters, move away from Python 2 unless you have a good reason to use
cd ..
Terminal (~/lorem): python3 app/main.py
import statement is relative to pwd.
--
James
On 16 December 2014 at 14:18, Juan Christian juan0christ...@gmail.com
wrote:
Python 3.4.1
Fedora 21 Server
My paths:
~/lorem
~/lorem/app
~/lorem/core
I want to execute: ~/lorem/app/main.py
Further to my last email, here's some reading regarding Python Paths
http://www.stereoplex.com/blog/understanding-imports-and-pythonpath
___
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
unsure of.
--
James
On 11 December 2014 at 11:39, James Chapman ja...@uplinkzero.com wrote:
On 2 December 2014 at 20:28, gordon zhang zhanggordon...@gmail.com
wrote:
I downloaded python 3.4.2 for c++ and create a vc++ project using python,
but I have no idea what python dlls and other
On 2 December 2014 at 20:28, gordon zhang zhanggordon...@gmail.com wrote:
I downloaded python 3.4.2 for c++ and create a vc++ project using python,
but I have no idea what python dlls and other stuff needed to deploy the
products.
I know if we put Python34.dll and Python.dll in the folder
While Alan has given you a far better solution, I feel someone should
mention the break statement as you will likely come across it a lot, and it
is quite an important flow control statement.
You could add a break statement to the else which would break out of the
while loop.
. Is that correct? If yes, would there be an obvious
advantage to either using GTK main loop or dealing with another thread?
2014-07-14 20:24 GMT+02:00 James Chapman ja...@uplinkzero.com:
OK, so I mocked up an example now...
import time
import threading
g_threadStop = threading.Event()
def
as an exit mechanism for normal operation.
Where to place the timer is up to you. Another thread is an option, but is
it necessary? Overhead needs to be considered.
--
James
On 15 July 2014 14:14, James Chapman ja...@uplinkzero.com wrote:
So if I understand this correctly, you want to start
Multi-threading takes practice!
Are you using an event object to signal the thread should exit? I'm
guessing you're just using a bool which is why it does not work.
See: https://docs.python.org/3.4/library/threading.html#event-objects
I'm very short on time and the moment and therefore can't
exiting...)
if __name__ == '__main__':
main()
--
James
On 14 July 2014 19:03, James Chapman ja...@uplinkzero.com wrote:
Multi-threading takes practice!
Are you using an event object to signal the thread should exit? I'm
guessing you're just using a bool which is why it does not work
You could just initialise your variables with float()
float(26)/float(12)
2.1665
varA = float(26)
varB = float(12)
varA/varB
2.1665
And so on...
In fact, you only need to initialise one variable with float for this to
work:
varA = float(26)
varB = 12
varA/varB
Depending on what you're doing you could run into problems.
Areas that have been challenging for me in the past:
* Loading 64bit compiled .dll in a 32bit Python environment and vice versa.
* Reading registry entries. MS tried to be clever by introducing the
Wow6432Node reg key.
And I'm sure
Perhaps I should look into Cython as I'm currently working on a
project that utilises a C API.
I've been finding that getting the data types to be exactly what the C
API is expecting to be the hardest part.
With the original question in mind, here's an example calling into a
C++ external C API:
AM, James Chapman ja...@uplinkzero.com wrote:
log_Q = multiprocessing.Queue()
This is a Queue from multiprocessing.queues. It uses system resources
(e.g. a semaphore for the queue capacity) that can be shared with
processes on the same machine.
A value `put` in a queue.Queue is available
James Chapman ja...@uplinkzero.com:
Hello tutors
I'm curious about managers and when to use them.
For example, I see they offer a Queue() for sharing a Q between
processes, but if I create a Q in the parent process and pass it down
to child processes, then they can put messages into that Q just
The answer lies in this page:
http://docs.python.org/3.3/library/stdtypes.html#string-methods
--
James
On 28 February 2014 11:44, James Chapman ja...@uplinkzero.com wrote:
The answer lies in this page:
http://docs.python.org/3.3/library/stdtypes.html#string-methods
--
James
On 28
Hello tutors
I'm curious about managers and when to use them.
For example, I see they offer a Queue() for sharing a Q between
processes, but if I create a Q in the parent process and pass it down
to child processes, then they can put messages into that Q just fine,
and I presume the same thing
Hello tutors
I've constructed an example which shows a problem I'm having testing a real
world program and would like to run it past you.
tutor_question.py
--
# -*- coding: utf-8 -*-
import sys
import threading
import time
class
will be substituted for some kind of
assert lines **
FYI I'm using CPython 2.7.something
--
James
On 31 January 2014 12:57, eryksun eryk...@gmail.com wrote:
On Fri, Jan 31, 2014 at 6:31 AM, James Chapman ja...@uplinkzero.com wrote:
try:
while self.attribute:
time.sleep(1
D'Aprano st...@pearwood.info wrote:
On Fri, Jan 31, 2014 at 11:31:49AM +, James Chapman wrote:
Hello tutors
I've constructed an example which shows a problem I'm having testing a real
world program and would like to run it past you.
[...]
class Infinite_Loop_Tutor_Question(object
, James Chapman ja...@uplinkzero.com
wrote:
In my unittest I don't want to run the ping command, (It might not be
available on the build system) I merely want to check that a call to
subprocess.Popen is made and that the parameters are what I expect?
You can mock `Popen` where it's
January 2014 10:50, eryksun eryk...@gmail.com wrote:
On Fri, Jan 17, 2014 at 4:58 AM, James Chapman ja...@uplinkzero.com
wrote:
import mock
import unittest
import pinger
class Test_Pinger(unittest.TestCase):
def test_ping_host_succeeds(self):
pinger = pinger.Pinger
.
--
James
On 17 January 2014 11:23, Steven D'Aprano st...@pearwood.info wrote:
On Fri, Jan 17, 2014 at 09:58:06AM +, James Chapman wrote:
As this question was just about mock and not really dealing with the bad
return code or exception handling or raising my final working example
looks
like
On 17 January 2014 15:32, Steven D'Aprano st...@pearwood.info wrote:
On Fri, Jan 17, 2014 at 08:35:04AM -0500, eryksun wrote:
On Fri, Jan 17, 2014 at 6:23 AM, Steven D'Aprano st...@pearwood.info
wrote:
On Fri, Jan 17, 2014 at 09:58:06AM +, James Chapman wrote:
[...]
import
Hi all
I have a question regarding mocking in unit testing.
Let's assume I have the following class:
---
import subprocess
class Pinger(object):
def ping_host(self, host_to_ping):
cmd_string = 'ping %s' % (host_to_ping)
cmd_args =
Hi there python list.
I'm trying to open a text file named This is_a-test'FILE to Ensure$
that£ stuff^ works.txt (without the quotes) but I'm struggling to
find a way to open it.
filename = This is_a-test'FILE to Ensure$ that£ stuff^
works.txt.js
open(filename)
Traceback (most recent call
Thanks Tim, while this works, I need the name to be stored in a
variable as it's dynamic.
In other words, how do I rewrite
open(ublah£.txt)
to be
filename = blah£.txt
open(filename)
At Thursday, 28/06/2012 on 18:39 Tim Golden wrote:
On 28/06/2012 18:19, James Chapman wrote:
Hi there python
byte 0x9c in position
35: invalid start byte
--
James
At Thursday, 28/06/2012 on 18:58 Jerry Hill wrote:
On Thu, Jun 28, 2012 at 1:55 PM, James Chapman wrote:
Thanks Tim, while this works, I need the name to be stored in a
variable as
it's dynamic.
In other words, how do I rewrite
open(ublah
Informative thanks Jerry, however I'm not out of the woods yet.
Here's a couple of questions that you'll need to answer 'Yes' to
before you're going to get this to work reliably:
Are you familiar with the differences between byte strings and unicode
strings?
I think so, although I'm
:
On 28/06/2012 20:48, James Chapman wrote:
The name of the file I'm trying to open comes from a UTF-16 encoded
text file, I'm then using regex to extract the string (filename) I
need to open.
OK. Let's focus on that. For the moment -- although it might
well be very relevant -- I'm going to ignore
traceback has:
child = winspawn('telnet 192.168.0.55:210')
When using telnet from CLI (on windows), you would type:
telnet 192.168.0.55 210
Note the space between the IP and port number and not a :colon.
Not sure this is your problem but probably worth mentioning.
--
James
At Saturday,
Hi there gurus and everyone else. This is my first post to this group,
and I'm turning here because I'm stumped and search engines are not
helping.
I've used smtplib for a few things already and while wanting to use
it again today, I'm having weird things happen.
Basically, my code looks like
D'Oh!
Of course!
I feel like a right pillock now.
Cheers for that though.
--
James
At Saturday, 24-04-2010 on 0:39 Jerry Hill wrote:
On Fri, Apr 23, 2010 at 6:41 PM, James Chapman wrote:
Hi there gurus and everyone else. This is my first post to this
group, and
I'm turning here because
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