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Hi Rami, Stefan, Bruno.<br>
<br>
First a big thanks for your replies. <br>
<br>
On 07/09/2010 20:54, Rami Chowdhury wrote:
<blockquote
cite="mid:AANLkTinWGCUDe8R4q4yo=gPsSH1-sNs82uFnXZKZxbD7@mail.gmail.com"
type="cite">
<div class="gmail_quote">Hi Ian,<br>
<br>
<div>I think I see where you're going wrong -- this bit me too
when I was learning Python, having come from PHP. Unlike PHP,
when you import a module in Python it does *not* inherit the
importing module's namespace. So the "log" function you're
accessing in DelNotePrinter.py is not the one you defined
above the import statement.<br>
<br>
</div>
</div>
</blockquote>
Hmm. My php background shows that much. Huh? :) I guess so. <br>
<blockquote
cite="mid:AANLkTinWGCUDe8R4q4yo=gPsSH1-sNs82uFnXZKZxbD7@mail.gmail.com"
type="cite">
<div class="gmail_quote"><br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000">
<div class="im">
<blockquote type="cite"> <br>
<a moz-do-not-send="true"
href="http://docs.python.org/reference/executionmodel.html#naming-and-binding"
target="_blank">http://docs.python.org/reference/executionmodel.html#naming-and-binding</a>
<br>
<br>
</blockquote>
</div>
Thanks for the pointer. What a truly execrable piece of
writing - full of over-long sentences and multiple
subordinate clauses. It routinely uses terms before
definition, and sometimes without definition. It is
astonishingly bad. <br>
</div>
</blockquote>
<div><br>
Perhaps you could help rewrite it? I'm sure the maintainers
would be very happy to get a documentation patch.<br>
</div>
</div>
</blockquote>
I would be happy to re-write it but I do need to understand the
subject better before that can happen. Clear and wrong will not help
anyone. :)<br>
<br>
<blockquote
cite="mid:AANLkTinWGCUDe8R4q4yo=gPsSH1-sNs82uFnXZKZxbD7@mail.gmail.com"
type="cite">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000"> <br>
Do I really have to move a 4 line function into its own
file and import it again and again and again? <br>
</div>
</blockquote>
<div><br clear="all">
</div>
</div>
The short answer is yes. If you have this and similar functions
that you call from various modules, then it's ideal to put them in
a utility module of their own. However, as imported modules are
cached in Python, this isn't as expensive as you might think if
you are more used to other languages.<br>
<br>
</blockquote>
OK. Now I understand the need, the solution is easy. <br>
<br>
My first exploration of the wonders of writing windows services has
had five things wrong with it:<br>
1) Its windows - spit, crash, complicated, can't start a command
line with elevated permissions, nash teeth, rip hair out. <br>
2) Its services - so no stdout, or stderr, errors not reported,
no "current directory" - burn and crash programming all over again.
Deep joy!<br>
3) pythonservice.exe - so module not called __main__ and
initialisation not performed (unseen - see 2) - More fun. <br>
4) multi-threading - I got really confused from this example <br>
<a class="moz-txt-link-freetext" href="http://docs.python.org/library/multiprocessing.html#exchanging-objects-between-processes">http://docs.python.org/library/multiprocessing.html#exchanging-objects-between-processes</a><br>
becasue I got the wrong sort of Queue, so it stalled when it failed
to call task_done() (there isn't such a method - but no error
reported see 2). <br>
5) Names pipes. The latest is that writing - yes writing - to the
named pipe causes the reader to fail with <br>
(232, 'ConnectNamedPipe', 'The pipe is being closed.') if I
write using php - yet I can write with python no trouble. <br>
<br>
There are down sides to "batteries included". When there are so many
batteries, it can be hard to know if what you have is "good enough"
or should you search for a more suitable one. Logging would have
helped me a lot (assuming it would work in service environment with
the permissions it would have had - a serious assumption). If it
failed, it would have failed and hidden the problem. <br>
<br>
Oh to get on to proper GUI programming with python and PyQt! The
next project. Wey Hey! <br>
<br>
Thanks again<br>
<br>
Ian <br>
<br>
<br>
<br>
<br>
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