menu and file

[hong zhang]

List,

I want to read a file that has a list of data into a menu. User can pick up a 
line of data and execute it. For example, file has data like following

1   23   0x4530
2   42   0x8790
3   75   0x7684
.

User can select line # and then execute hex data in that line.
Any sample codes will be appreciated.

Thanks!

--henry


  
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Re: Is it possible to get the erroneous variable when getting a NameError exception?

[Stephen Hansen]

On Fri, Dec 25, 2009 at 8:00 PM, Dave Angel  wrote:

>  Dotan Barak wrote:
>>>
>>> Recover the exception, and examine the tuple of args or the message
>>> string.
>>> >>> try:
>>> ... eval("my_number < 10", {"__builtins__":None}, {})
>>> ... except NameError,e:
>>> ... print e.args
>>> ... print e.message
>>> ...
>>> ("name 'my_number' is not defined",)
>>> name 'my_number' is not defined
>>>
>>>  I think there's a more fundamental question here.  You're apparently
> looking to build your own error message instead of using the one already
> generated.  But as you point out, you might end up parsing the existing
> error message in order to do that, and that's fragile coding.  My take is
> that if you're using "eval" in your code, your user is clearly a programmer.
>  So why are you not letting that programmer see the real error message,
> instead of trying to pretty it up?  You can add to the message, but
> shouldn't need to hide the original one.
>
> To put it the other way around, if your user can't understand the python
> error messages, you should probably not be using unrestricted "eval" on
> something that user supplies.  Lots more errors than NameError, and many of
> them are more subtle and dangerous.
>
>
Hm, is this true, though? Is there anything subtle or dangerous possible
here? He's using eval-- so no statements, its only an expression. He's
passing in a 'globals' which has __builtins__ set to None, so this
environment has access to -- basically nothing. Then the locals dictionary
is empty as well, though I assume he'll fill it with things like my_number.

Its sort of an interesting use for 'eval' that I hadn't ever considered
before, really: ISTM that there's only three possible results.. a NameError,
a SyntaxError, or a safely evaluated expression based on certain pre-defined
objects. Okay, maybe one or two other simple exceptions if one tries to do
strange things with dictionaries/etc in the expression. You can't even make
it blow up to trigger a MemoryError, with some insane list comprehension
because you don't even have access to range(). Unless he's passing an
arbitrarily long string into the expression.

I'm normally against eval -- but maybe I'm blind in not seeing the possible
exploit or subtlety here in this eval-with-zero-access.

--S
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Re: Extra fields for logging

[Steven D'Aprano]

On Fri, 25 Dec 2009 12:07:20 -0800, Joan Miller wrote:

> On 25 dic, 13:24, Steven D'Aprano  cybersource.com.au> wrote:
>> On Thu, 24 Dec 2009 05:06:48 -0800, Joan Miller wrote:
>> > I'm trying to add some extra fields to logging, I'm following this
>> > information [1] but it faills in my case.
>> [...]
>> > I get => KeyError: 'host'
>>
>> Please post the entire traceback you get.
>>
>> --
>> Steven
> 
> Traceback (most recent call last):
>   File "/usr/lib/python2.6/logging/__init__.py", line 768, in emit
> msg = self.format(record)
>   File "/usr/lib/python2.6/logging/__init__.py", line 648, in format
> return fmt.format(record)
>   File "/usr/lib/python2.6/logging/__init__.py", line 439, in format
> s = self._fmt % record.__dict__
> KeyError: 'host'


Hmmm... that wasn't as helpful as I had hoped. Oh well.

Going back to your earlier post, I can see a couple of problems.

Firstly, your __getitem__ method always returns None. You need to return 
the result.

Secondly, this works for me:


import logging
class ExtraInfo(object):
def __getitem__(self, name):
if name == 'host':
result = 'foo'
return result
def __iter__(self):
keys = ['host',]
keys.extend(self.__dict__.keys())
return iter(keys)  # better than keys.__iter__

def setup(filename='/tmp/foo.log'):
log = logging.LoggerAdapter(logging.getLogger('foo'), ExtraInfo())
logging.basicConfig(
level=logging.DEBUG,
format="""Date-Time: %(asctime)s
Host: %(host)s
%(levelname)s:
%(message)s""",
datefmt="%Y-%m-%dT%H:%M:%S%z",
filename=filename,
filemode='w')
return log

log = setup()
log.error('testing ...')
log.debug('something happened')
log.critical("it's the end of the world as we know it!")





Hope this helps.


-- 
Steven
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Re: how to register with pypi - no such setup.py

[Phlip]

On Dec 24, 3:32 am, "Martin v. Loewis"  wrote:
> > Any tips?
>
> A binary distribution won't have a setup.py, because
> you can install it by other means (such as Windows Installer),
> instead of running setup.py
>
> What you want is a source distribution (sdist).

Thanks. Yes, this is prob'ly documented somewhere.

Now my next problem - how to get pypi.python.org to stop burning up
version numbers each time I test this?
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Re: Is it possible to get the erroneous variable when getting a NameError exception?

[Dave Angel]

Dotan Barak wrote:
On 
25/12/2009 19:27, Gary Herron wrote:

Dotan Barak wrote:

Recover the exception, and examine the tuple of args or the message 
string.

>>> try:
... eval("my_number < 10", {"__builtins__":None}, {})
... except NameError,e:
... print e.args
... print e.message
...
("name 'my_number' is not defined",)
name 'my_number' is not defined


First of all, thank - I really appreciate your response.
:)

I must admit that i don't like the idea of parsing a string (if 
tomorrow the format of the message will change,

i will be in a deep trouble ...).

Is there is another way which doesn't involve string parsing?

Thanks
Dotan



I think there's a more fundamental question here.  You're apparently 
looking to build your own error message instead of using the one already 
generated.  But as you point out, you might end up parsing the existing 
error message in order to do that, and that's fragile coding.  My take 
is that if you're using "eval" in your code, your user is clearly a 
programmer.  So why are you not letting that programmer see the real 
error message, instead of trying to pretty it up?  You can add to the 
message, but shouldn't need to hide the original one.


To put it the other way around, if your user can't understand the python 
error messages, you should probably not be using unrestricted "eval" on 
something that user supplies.  Lots more errors than NameError, and many 
of them are more subtle and dangerous.


DaveA

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how to save a modified .xml back

[Hyunchul Kim]

Hi all,

I want to load a small .xml file, modifiy some nodes and save the .xml with
modifications to another .xml file.

I managed to load and modify a small .xml file using xml.dom.minidom and
xml.dom.pulldom.

However, I don't know how to save it back using any of two modules.

Any suggestion?

Thank you in advance,

**
from xml.dom.pulldom import START_ELEMENT, parse
doc = parse('input.xml')
for event, node in doc:
if event == START_ELEMENT and node.localName == "something_interesting":
doc.expandNode(node)
for an_element in node.childNodes:
do_something()
*

Hyunchul
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Re: How do I install GMPY 1.11 on a Mac with OS X 10.6 and Python 3.1?

[Benjamin Kaplan]

On Fri, Dec 25, 2009 at 1:19 PM, Mensanator  wrote:
> On Dec 25, 9:25 am, Benjamin Kaplan  wrote:
>> On Fri, Dec 25, 2009 at 1:48 AM, Mensanator  wrote:
>> > On Dec 24, 10:18 pm, Benjamin Kaplan  wrote:
>> >> On Thu, Dec 24, 2009 at 9:11 PM, Mensanator  wrote:
>> >> > Ok, so I got a MacBook Air.
>>
>> >> > Has OS X 10.6 (Snow Leopard) and Python 2.6.1 already installed.
>>
>> >> > So I install Xcode, download macports and download gmpy-1.11rc1.
>>
>> >> > Following the instructions in mac_build.txt, I do the following:
>>
>> >> > - sudo /opt/local/bin/port install gmp
>>
>> >> > This works fine.
>>
>> >> > Then I do
>>
>> >> > - python setup.py install
>>
>> >> > This also works (a few warnings, but nothing looked serious).
>>
>> >> > Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
>> >> > [GCC 4.2.1 (Apple Inc. build 5646)] on darwin
>> >> > Type "help", "copyright", "credits" or "license" for more information.
>> >>  import gmpy
>> >>  gmpy.version()
>> >> > '1.11'
>>
>> >> > python gmpy_test.py
>> >> > Unit tests for gmpy 1.11
>> >> >    on Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
>> >> > [GCC 4.2.1 (Apple Inc. build 5646)]
>> >> > Testing gmpy 1.11 (GMP 4.3.1), default caching (100, 128)
>> >> > gmpy_test_cvr 151 tests, 0 failures
>> >> > .
>> >> > .
>> >> > .
>> >> >  25 tests in gmpy_test_rnd.__test__.rand
>> >> > 1469 tests in 42 items.
>> >> > 1469 passed and 0 failed.
>> >> > Test passed.
>>
>> >> > Looks like a viable gmpy module for 2.6.
>>
>> >> > What do I do AFTER I install Python 3.1? Just running python3.1 from
>> >> > the
>> >> > same directory doesn't work.
>>
>> >> > I've spent the last 5 days trying to figure that out. I hosed it so
>> >> > bad
>> >> > I somehow wrecked the 2.6 version to the point where it won't even
>> >> > load.
>>
>> >> > I just got done doing a factory restore of the entire OS to undo
>> >> > everything
>> >> > I did. Re-did all the above and got it back working. Haven't re-
>> >> > installed 3.1
>> >> > yet.
>>
>> >> > Anbody have any idea how to make this work?
>>
>> >> Did you run setup.py with python3? Python 3.1 won't install itself as
>> >> the default python install for compatibility reasons so you have to
>> >> run "python3 install setup.py" to install it for that version of
>> >> python.
>>
>> > I wondered why there was both python3 and python3.1 in the bin
>> > directory.
>>
>> > But why, when I type...
>>
>> > $ python3
>>
>> > ...do I get...
>>
>> > Python 3.1.1 (r311:74543, Aug 24 2009, 18:44:04)
>> > [GCC 4.0.1 (Apple Inc. build 5493)] on darwin
>> > Type "help", "copyright", "credits" or "license" for more information.
>>
>> > [1]+  Stopped                 python3
>>
>> > I get the same result with python3.1.
>>
>> > So, no, trying python3 is of no help, same errors as before.
>> > There's hundreds of them, but they start out
>>
>> > $ /Library/Frameworks/Python.framework/Versions/3.1/bin/python3
>> > setup.py install
>> > running install
>> > running build
>> > running build_ext
>> > building 'gmpy' extension
>> > creating build/temp.macosx-10.3-fat-3.1
>> > creating build/temp.macosx-10.3-fat-3.1/src
>> > Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/
>> > MacOSX10.4u.sdk
>> > Please check your Xcode installation
>> > gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -
>> > fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -O3 -I./src -I/
>> > opt/local/include -I/Library/Frameworks/Python.framework/Versions/3.1/
>> > include/python3.1 -c src/gmpy.c -o build/temp.macosx-10.3-fat-3.1/src/
>> > gmpy.o
>> > In file included from src/gmpy.c:206:
>> > /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
>> > Python.h:11:20: error: limits.h: No such file or directory
>> > /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
>> > Python.h:14:2: error: #error "Something's broken.  UCHAR_MAX should be
>> > defined in limits.h."
>> > /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
>> > Python.h:18:
>>
>> > Any other ideas? Do I have to install a separate Python 3?
>>
>> That's not a Python 3 problem. It appears to be a problem in the build 
>> script.
>>
>> > Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/
>> > MacOSX10.4u.sdk
>>
>> My guess would be you're on Snow Leopard while the original developer
>> is either on Tiger or Leopard. The script wants to use the 10.4 SDK
>> but Apple only includes the SDKs for the latest 2 versions of OS X.
>
> I just thought of something. Why I am able to do the build for python
> 2.6?
> Wouldn't that also fail for lack of a 10.4 SDK?
>

I think you'd need different C sources for 2.x and 3.x because I think
the C API changed quite a bit. That might be why it worked for 2.6 but
failed for 3.1
>>
>>
>>
>>
>>
>> >> > --
>> >> >http://mail.python.org/mailman/listinfo/python-list
>>
>> > --
>> >http://mail.python.org/mailman/listinfo/python-list
>
> --
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Re: getlist question

[Steven D'Aprano]

On Fri, 25 Dec 2009 12:59:20 -0500, Benjamin Kaplan wrote:

> On Fri, Dec 25, 2009 at 12:40 PM, Victor Subervi
>  wrote:
>>
>> It returns nothing. I believe I've stated that three times now.
> 
> In Python, that's not possible. Every function returns something.


Unless it raises an exception.


> If you
> think it returns nothing, it probably returns None.

Very possibly, but this is Victor you're talking too, and as far as I can 
tell he hasn't shown his actual code. For all we know he has something 
like this:

alist = [1, 2, 3]
try:
result = alist[100]
except:
pass
print result


See? Nothing is returned as the result.


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Re: Queues vs List

[MRAB]

Rodrick Brown wrote:
Was reading the official python document and I noticed they mentioned 
queues being more efficient for adding/removing elements vs list so I 
wrote a quick test the validate this claim and I wasn't very impressed 
by the results it seems queues are just slightly faster so my question 
to the list, is deque used much in python over general lists? 



  1 #!/usr/bin/python
  2 
  3 import time

  4 from collections import deque
  5 
  6 nameList = ["Eric","John","Michael"]

  7 #queue = deque(["Eric","John","Michael"])
  8 queue = deque(nameList)
  9 
 10 def buildItems_q(q,n,mode):

 11 start = 0
 12 end = 0
 13 
 14 if mode == 'q':

 15 start = time.time()
 16 for r in xrange(n):
 17 queue.append("Terry_%s" % r)
 18 end = time.time()
 19 
 20 while q.pop() is not None:

 21 try:
 22 q.pop()
 23 except IndexError:
 24 pass
 25 break
 26 else:
 27 start = time.time()
 28 for r in xrange(n):
 29 q.append("Terry_%s" % r)
 30 end = time.time()
 31 
 32 while q.pop() is not None:

 33 try:
 34 q.pop()
 35 except IndexError:
 36 pass
 37 break
 38 
 39 return (end - start)
 40 
 41 if __name__ == "__main__":

 42 size = 1000
 43 mode = 'list'
44 runtime = buildItems_q(queue,size,mode)
 45 print "Total run time: %f (%s)" % (runtime,mode)
 46 
 47 mode = 'Queue'

 48 runtime = buildItems_q(queue,size,mode)
 49 print "Total run time: %f (%s)" % (runtime,mode)


rbr...@laptop:~/code/python$ python queue.py 
Total run time: 5.169290 (list)

Total run time: 5.112517 (Queue)


You're passing either 'list' or 'Queue' into buildItems_q(), but testing
for 'q'.
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Re: Queues vs List

[Cameron Simpson]

On 25Dec2009 17:21, Rodrick Brown  wrote:
| Was reading the official python document and I noticed they mentioned queues
| being more efficient for adding/removing elements vs list so I wrote a quick
| test the validate this claim and I wasn't very impressed by the results it
| seems queues are just slightly faster so my question to the list, is deque
| used much in python over general lists?

A deque has O(1) behaviour for adding or removing elements from the
front or back of the deque. It has O(n) behaviour for lookups.

A list has O(n) behaviour for adding/removing, roughly. It has O(1)
behaviour for lookups. Removing from the front requires copying all
the higher elements down, for example. Adding to the end _may_ cost a
copy-the-whole-list if memory needs reallocating.

But your lists/deques are VERY small. A deque is a more complicated
structure (probably a linked list - I haven't checked). Its basic
operation is more expensive and for your test cases probably overwhlems
things. You need to use bigger test cases before the deque wins over the
list, and of course a deque is only better than a list of your program
has behaviour that is expensive for a list.

Cheers,
-- 
Cameron Simpson  DoD#743
http://www.cskk.ezoshosting.com/cs/

Team work is essential.  It gives the enemy other people to shoot at.
- Murphy's Laws of Combat
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Queues vs List

[Rodrick Brown]

Was reading the official python document and I noticed they mentioned queues
being more efficient for adding/removing elements vs list so I wrote a quick
test the validate this claim and I wasn't very impressed by the results it
seems queues are just slightly faster so my question to the list, is deque
used much in python over general lists?


  1 #!/usr/bin/python
  2
  3 import time
  4 from collections import deque
  5
  6 nameList = ["Eric","John","Michael"]
  7 #queue = deque(["Eric","John","Michael"])
  8 queue = deque(nameList)
  9
 10 def buildItems_q(q,n,mode):
 11 start = 0
 12 end = 0
 13
 14 if mode == 'q':
 15 start = time.time()
 16 for r in xrange(n):
 17 queue.append("Terry_%s" % r)
 18 end = time.time()
 19
 20 while q.pop() is not None:
 21 try:
 22 q.pop()
 23 except IndexError:
 24 pass
 25 break
 26 else:
 27 start = time.time()
 28 for r in xrange(n):
 29 q.append("Terry_%s" % r)
 30 end = time.time()
 31
 32 while q.pop() is not None:
 33 try:
 34 q.pop()
 35 except IndexError:
 36 pass
 37 break
 38
 39 return (end - start)
 40
 41 if __name__ == "__main__":
 42 size = 1000
 43 mode = 'list'
44 runtime = buildItems_q(queue,size,mode)
 45 print "Total run time: %f (%s)" % (runtime,mode)
 46
 47 mode = 'Queue'
 48 runtime = buildItems_q(queue,size,mode)
 49 print "Total run time: %f (%s)" % (runtime,mode)


rbr...@laptop:~/code/python$ python queue.py
Total run time: 5.169290 (list)
Total run time: 5.112517 (Queue)




-- 
[ Rodrick R. Brown ]
http://www.rodrickbrown.com http://www.linkedin.com/in/rodrickbrown
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Re: Is it possible to get the erroneous variable when getting a NameError exception?

[Gary Herron]

Dotan Barak wrote:

On 25/12/2009 19:27, Gary Herron wrote:

Dotan Barak wrote:

Recover the exception, and examine the tuple of args or the message 
string.

>>> try:
... eval("my_number < 10", {"__builtins__":None}, {})
... except NameError,e:
... print e.args
... print e.message
...
("name 'my_number' is not defined",)
name 'my_number' is not defined


First of all, thank - I really appreciate your response.
:)

I must admit that i don't like the idea of parsing a string (if 
tomorrow the format of the message will change,

i will be in a deep trouble ...).

Is there is another way which doesn't involve string parsing?

Thanks
Dotan
OK.  Try this:  Executing your code attempts to lookup variables in a 
local dictionary.   You can rig up a local dictionary of your own 
choosing -- in this case, I have it print the name of any variable that 
is being looked up before actually doing the lookup.But at that 
point, you have what you want, that is, the name as a string -- you can 
do with it as you will -- record it, or print your nice error, or ...


You probably want to change my def of __getitem__ to attempt the lookup 
first -- if that succeeds, return the value -- if it fails, then handle 
the error.


Good luck,

Gary Herron



class D(dict):
   def __getitem__(self, name):
   print 'retrieving', name
   return dict.__getitem__(self,name)

locals = D(b=123) # Defines b in a local dictionary
exec("a=2*b", locals)  # Looks up b in locals
print locals['a'] # Returns the result (stored in 'a' in locals)

locals = D() # Does not define b in the local dictionary
exec("a=2*b", locals) # Fails to find b in locals

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Re: Recommendation for small, fast, Python based web server

[mdipierro]

This is a new wsgi web server implemented in a single file.

http://code.google.com/p/web2py/source/browse/gluon/sneaky.py

I could use some help with testing.

Here is a version for Python 3.0

http://code.google.com/p/web2py/source/browse/gluon/sneaky.py


Massimo

On Dec 25, 12:38 pm, a...@pythoncraft.com (Aahz) wrote:
> In article ,
> Antoine Pitrou   wrote:
>
>
>
> >Apparently you have debugged your speed issue so I suppose you don't have
> >performance problems anymore. Do note, however, that Python is generally
> >not as fast as C -- especially for low-level stuff -- and a Python Web
> >server will probably serve around 10x less requests per second than a C
> >Web server like Apache (this will still give you hundreds of simple
> >requests per second on a modern machine).
>
> For static pages or dynamic pages?  Once you get into dynamic pages, I
> sincerely doubt that the smaller Apache overhead makes lots of
> difference.
> --
> Aahz (a...@pythoncraft.com)           <*>        http://www.pythoncraft.com/
>
> Looking back over the years, after I learned Python I realized that I
> never really had enjoyed programming before.

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Re: Extra fields for logging

[Joan Miller]

On 25 dic, 13:24, Steven D'Aprano  wrote:
> On Thu, 24 Dec 2009 05:06:48 -0800, Joan Miller wrote:
> > I'm trying to add some extra fields to logging, I'm following this
> > information [1] but it faills in my case.
> [...]
> > I get => KeyError: 'host'
>
> Please post the entire traceback you get.
>
> --
> Steven

On 25 dic, 13:24, Steven D'Aprano  wrote:
> On Thu, 24 Dec 2009 05:06:48 -0800, Joan Miller wrote:
> > I'm trying to add some extra fields to logging, I'm following this
> > information [1] but it faills in my case.
> [...]
> > I get => KeyError: 'host'
>
> Please post the entire traceback you get.
>
> --
> Steven

Traceback (most recent call last):
  File "/usr/lib/python2.6/logging/__init__.py", line 768, in emit
msg = self.format(record)
  File "/usr/lib/python2.6/logging/__init__.py", line 648, in format
return fmt.format(record)
  File "/usr/lib/python2.6/logging/__init__.py", line 439, in format
s = self._fmt % record.__dict__
KeyError: 'host'
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Re: Perl to Python conversion

[John Yeung]

On Dec 13, 5:23 pm, martin.sch...@gmail.com (Martin Schöön) wrote:
> r0g  writes:
> > You'll probably find the majority of code in a GUI
> > app is boring window handling stuff [...]
> > Also, they probably didn't make it with
> > QT which is fairly different from GTK.
>
> Tk is what they used.

Well, on the surface then, it would seem that it might be easier to
just use Python's included Tkinter for the GUI bits.  However, PyQt is
widely regarded as a nicer and more capable package.

John
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Re: Is it possible to get the erroneous variable when getting a NameError exception?

[Dotan Barak]

On 25/12/2009 19:27, Gary Herron wrote:

Dotan Barak wrote:

Recover the exception, and examine the tuple of args or the message 
string.

>>> try:
... eval("my_number < 10", {"__builtins__":None}, {})
... except NameError,e:
... print e.args
... print e.message
...
("name 'my_number' is not defined",)
name 'my_number' is not defined


First of all, thank - I really appreciate your response.
:)

I must admit that i don't like the idea of parsing a string (if tomorrow 
the format of the message will change,

i will be in a deep trouble ...).

Is there is another way which doesn't involve string parsing?

Thanks
Dotan
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Re: Mechanize - Click a table row to navigate to detail page

[S.Selvam]

On Fri, Dec 25, 2009 at 4:06 PM, Diez B. Roggisch wrote:

> Brian D schrieb:
>
>  A search form returns a list of records embedded in a table.
>>
>> The user has to click on a table row to call a Javascript call that
>> opens up the detail page.
>>
>> It's the detail page, of course, that really contains the useful
>> information.
>>
>> How can I use Mechanize to click a row?
>>
>
> You can't, if there is javascript involved. You can try & use Firebug to
> see what the javascript eventually calls, with which parameters. Then
> construct that url based on the parameters in the table row's javascript
> (which of course you have to parse yourself out of the code)
>

In firefox you can install LiveHttp Headers addon and can find the needed
url.

>
> Diez
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Regards,
S.Selvam
-- 
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Re: Recommendation for small, fast, Python based web server

[Aahz]

In article ,
Antoine Pitrou   wrote:
>
>Apparently you have debugged your speed issue so I suppose you don't have 
>performance problems anymore. Do note, however, that Python is generally 
>not as fast as C -- especially for low-level stuff -- and a Python Web 
>server will probably serve around 10x less requests per second than a C 
>Web server like Apache (this will still give you hundreds of simple 
>requests per second on a modern machine).

For static pages or dynamic pages?  Once you get into dynamic pages, I
sincerely doubt that the smaller Apache overhead makes lots of
difference.
-- 
Aahz (a...@pythoncraft.com)   <*> http://www.pythoncraft.com/

Looking back over the years, after I learned Python I realized that I
never really had enjoyed programming before.
-- 
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Re: Perl to Python conversion

[Aahz]

In article <87zl5rnayz@crunchbang.belkin>,
Martin =?utf-8?B?U2Now7bDtm4=?=  wrote:
>
>Problem: I have come across a small open source application that I find
>quite useful. It does have one major flaw though.  Its output is in
>imperial units. Converting isn't a big deal for occasional use but if I
>start to use this stuff on a regular basis...

I'd write an imperial to metric converter in Python  ;-)
-- 
Aahz (a...@pythoncraft.com)   <*> http://www.pythoncraft.com/

Looking back over the years, after I learned Python I realized that I
never really had enjoyed programming before.
-- 
http://mail.python.org/mailman/listinfo/python-list

Re: How do I install GMPY 1.11 on a Mac with OS X 10.6 and Python 3.1?

[Mensanator]

On Dec 25, 9:25 am, Benjamin Kaplan  wrote:
> On Fri, Dec 25, 2009 at 1:48 AM, Mensanator  wrote:
> > On Dec 24, 10:18 pm, Benjamin Kaplan  wrote:
> >> On Thu, Dec 24, 2009 at 9:11 PM, Mensanator  wrote:
> >> > Ok, so I got a MacBook Air.
>
> >> > Has OS X 10.6 (Snow Leopard) and Python 2.6.1 already installed.
>
> >> > So I install Xcode, download macports and download gmpy-1.11rc1.
>
> >> > Following the instructions in mac_build.txt, I do the following:
>
> >> > - sudo /opt/local/bin/port install gmp
>
> >> > This works fine.
>
> >> > Then I do
>
> >> > - python setup.py install
>
> >> > This also works (a few warnings, but nothing looked serious).
>
> >> > Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
> >> > [GCC 4.2.1 (Apple Inc. build 5646)] on darwin
> >> > Type "help", "copyright", "credits" or "license" for more information.
> >>  import gmpy
> >>  gmpy.version()
> >> > '1.11'
>
> >> > python gmpy_test.py
> >> > Unit tests for gmpy 1.11
> >> >    on Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
> >> > [GCC 4.2.1 (Apple Inc. build 5646)]
> >> > Testing gmpy 1.11 (GMP 4.3.1), default caching (100, 128)
> >> > gmpy_test_cvr 151 tests, 0 failures
> >> > .
> >> > .
> >> > .
> >> >  25 tests in gmpy_test_rnd.__test__.rand
> >> > 1469 tests in 42 items.
> >> > 1469 passed and 0 failed.
> >> > Test passed.
>
> >> > Looks like a viable gmpy module for 2.6.
>
> >> > What do I do AFTER I install Python 3.1? Just running python3.1 from
> >> > the
> >> > same directory doesn't work.
>
> >> > I've spent the last 5 days trying to figure that out. I hosed it so
> >> > bad
> >> > I somehow wrecked the 2.6 version to the point where it won't even
> >> > load.
>
> >> > I just got done doing a factory restore of the entire OS to undo
> >> > everything
> >> > I did. Re-did all the above and got it back working. Haven't re-
> >> > installed 3.1
> >> > yet.
>
> >> > Anbody have any idea how to make this work?
>
> >> Did you run setup.py with python3? Python 3.1 won't install itself as
> >> the default python install for compatibility reasons so you have to
> >> run "python3 install setup.py" to install it for that version of
> >> python.
>
> > I wondered why there was both python3 and python3.1 in the bin
> > directory.
>
> > But why, when I type...
>
> > $ python3
>
> > ...do I get...
>
> > Python 3.1.1 (r311:74543, Aug 24 2009, 18:44:04)
> > [GCC 4.0.1 (Apple Inc. build 5493)] on darwin
> > Type "help", "copyright", "credits" or "license" for more information.
>
> > [1]+  Stopped                 python3
>
> > I get the same result with python3.1.
>
> > So, no, trying python3 is of no help, same errors as before.
> > There's hundreds of them, but they start out
>
> > $ /Library/Frameworks/Python.framework/Versions/3.1/bin/python3
> > setup.py install
> > running install
> > running build
> > running build_ext
> > building 'gmpy' extension
> > creating build/temp.macosx-10.3-fat-3.1
> > creating build/temp.macosx-10.3-fat-3.1/src
> > Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/
> > MacOSX10.4u.sdk
> > Please check your Xcode installation
> > gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -
> > fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -O3 -I./src -I/
> > opt/local/include -I/Library/Frameworks/Python.framework/Versions/3.1/
> > include/python3.1 -c src/gmpy.c -o build/temp.macosx-10.3-fat-3.1/src/
> > gmpy.o
> > In file included from src/gmpy.c:206:
> > /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
> > Python.h:11:20: error: limits.h: No such file or directory
> > /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
> > Python.h:14:2: error: #error "Something's broken.  UCHAR_MAX should be
> > defined in limits.h."
> > /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
> > Python.h:18:
>
> > Any other ideas? Do I have to install a separate Python 3?
>
> That's not a Python 3 problem. It appears to be a problem in the build script.
>
> > Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/
> > MacOSX10.4u.sdk
>
> My guess would be you're on Snow Leopard while the original developer
> is either on Tiger or Leopard. The script wants to use the 10.4 SDK
> but Apple only includes the SDKs for the latest 2 versions of OS X.

I just thought of something. Why I am able to do the build for python
2.6?
Wouldn't that also fail for lack of a 10.4 SDK?

>
>
>
>
>
> >> > --
> >> >http://mail.python.org/mailman/listinfo/python-list
>
> > --
> >http://mail.python.org/mailman/listinfo/python-list

-- 
http://mail.python.org/mailman/listinfo/python-list

Re: How do I install GMPY 1.11 on a Mac with OS X 10.6 and Python 3.1?

[Benjamin Kaplan]

On Fri, Dec 25, 2009 at 1:09 PM, Mensanator  wrote:
> On Dec 25, 9:25 am, Benjamin Kaplan  wrote:
>> On Fri, Dec 25, 2009 at 1:48 AM, Mensanator  wrote:
>> > On Dec 24, 10:18 pm, Benjamin Kaplan  wrote:
>> >> On Thu, Dec 24, 2009 at 9:11 PM, Mensanator  wrote:
>> >> > Ok, so I got a MacBook Air.
>>
>> >> > Has OS X 10.6 (Snow Leopard) and Python 2.6.1 already installed.
>>
>> >> > So I install Xcode, download macports and download gmpy-1.11rc1.
>>
>> >> > Following the instructions in mac_build.txt, I do the following:
>>
>> >> > - sudo /opt/local/bin/port install gmp
>>
>> >> > This works fine.
>>
>> >> > Then I do
>>
>> >> > - python setup.py install
>>
>> >> > This also works (a few warnings, but nothing looked serious).
>>
>> >> > Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
>> >> > [GCC 4.2.1 (Apple Inc. build 5646)] on darwin
>> >> > Type "help", "copyright", "credits" or "license" for more information.
>> >>  import gmpy
>> >>  gmpy.version()
>> >> > '1.11'
>>
>> >> > python gmpy_test.py
>> >> > Unit tests for gmpy 1.11
>> >> >    on Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
>> >> > [GCC 4.2.1 (Apple Inc. build 5646)]
>> >> > Testing gmpy 1.11 (GMP 4.3.1), default caching (100, 128)
>> >> > gmpy_test_cvr 151 tests, 0 failures
>> >> > .
>> >> > .
>> >> > .
>> >> >  25 tests in gmpy_test_rnd.__test__.rand
>> >> > 1469 tests in 42 items.
>> >> > 1469 passed and 0 failed.
>> >> > Test passed.
>>
>> >> > Looks like a viable gmpy module for 2.6.
>>
>> >> > What do I do AFTER I install Python 3.1? Just running python3.1 from
>> >> > the
>> >> > same directory doesn't work.
>>
>> >> > I've spent the last 5 days trying to figure that out. I hosed it so
>> >> > bad
>> >> > I somehow wrecked the 2.6 version to the point where it won't even
>> >> > load.
>>
>> >> > I just got done doing a factory restore of the entire OS to undo
>> >> > everything
>> >> > I did. Re-did all the above and got it back working. Haven't re-
>> >> > installed 3.1
>> >> > yet.
>>
>> >> > Anbody have any idea how to make this work?
>>
>> >> Did you run setup.py with python3? Python 3.1 won't install itself as
>> >> the default python install for compatibility reasons so you have to
>> >> run "python3 install setup.py" to install it for that version of
>> >> python.
>>
>> > I wondered why there was both python3 and python3.1 in the bin
>> > directory.
>>
>> > But why, when I type...
>>
>> > $ python3
>>
>> > ...do I get...
>>
>> > Python 3.1.1 (r311:74543, Aug 24 2009, 18:44:04)
>> > [GCC 4.0.1 (Apple Inc. build 5493)] on darwin
>> > Type "help", "copyright", "credits" or "license" for more information.
>>
>> > [1]+  Stopped                 python3
>>
>> > I get the same result with python3.1.
>>
>> > So, no, trying python3 is of no help, same errors as before.
>> > There's hundreds of them, but they start out
>>
>> > $ /Library/Frameworks/Python.framework/Versions/3.1/bin/python3
>> > setup.py install
>> > running install
>> > running build
>> > running build_ext
>> > building 'gmpy' extension
>> > creating build/temp.macosx-10.3-fat-3.1
>> > creating build/temp.macosx-10.3-fat-3.1/src
>> > Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/
>> > MacOSX10.4u.sdk
>> > Please check your Xcode installation
>> > gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -
>> > fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -O3 -I./src -I/
>> > opt/local/include -I/Library/Frameworks/Python.framework/Versions/3.1/
>> > include/python3.1 -c src/gmpy.c -o build/temp.macosx-10.3-fat-3.1/src/
>> > gmpy.o
>> > In file included from src/gmpy.c:206:
>> > /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
>> > Python.h:11:20: error: limits.h: No such file or directory
>> > /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
>> > Python.h:14:2: error: #error "Something's broken.  UCHAR_MAX should be
>> > defined in limits.h."
>> > /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
>> > Python.h:18:
>>
>> > Any other ideas? Do I have to install a separate Python 3?
>>
>> That's not a Python 3 problem. It appears to be a problem in the build 
>> script.
>>
>> > Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/
>> > MacOSX10.4u.sdk
>>
>> My guess would be you're on Snow Leopard
>
> Yes, this machine has OS X 10.6.
>
>> while the original developer
>> is either on Tiger or Leopard. The script wants to use the 10.4 SDK
>> but Apple only includes the SDKs for the latest 2 versions of OS X.
>
> Is there any easy way to fix the build script? Is there a hard way?
> Which files comprise the build script?
>
> Thanks for your help.
>

I honestly have no idea how to fix this. I'm not very experienced with
build scripts. I just noticed that I had the 10.4 SDK on Leopard but
not on Snow Leopard and the script seems to want that version. My
guess would be that the option is either in a setup.py file or a
makefile in there.

>>
>>
>>
>>
>>
>> >> > --

Re: getlist question

[Victor Subervi]

On Fri, Dec 25, 2009 at 12:59 PM, Benjamin Kaplan
wrote:

> On Fri, Dec 25, 2009 at 12:40 PM, Victor Subervi
>  wrote:
> >
> > It returns nothing. I believe I've stated that three times now.
>
> In Python, that's not possible. Every function returns something. If
> you think it returns nothing, it probably returns None.
>
> >>> def foo() : pass
> ...
> >>> a = foo()
> >>> print a
> None
>

Thanks. It was returning an empty set which I have logged.
beno
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Re: How do I install GMPY 1.11 on a Mac with OS X 10.6 and Python 3.1?

[Mensanator]

On Dec 25, 9:25 am, Benjamin Kaplan  wrote:
> On Fri, Dec 25, 2009 at 1:48 AM, Mensanator  wrote:
> > On Dec 24, 10:18 pm, Benjamin Kaplan  wrote:
> >> On Thu, Dec 24, 2009 at 9:11 PM, Mensanator  wrote:
> >> > Ok, so I got a MacBook Air.
>
> >> > Has OS X 10.6 (Snow Leopard) and Python 2.6.1 already installed.
>
> >> > So I install Xcode, download macports and download gmpy-1.11rc1.
>
> >> > Following the instructions in mac_build.txt, I do the following:
>
> >> > - sudo /opt/local/bin/port install gmp
>
> >> > This works fine.
>
> >> > Then I do
>
> >> > - python setup.py install
>
> >> > This also works (a few warnings, but nothing looked serious).
>
> >> > Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
> >> > [GCC 4.2.1 (Apple Inc. build 5646)] on darwin
> >> > Type "help", "copyright", "credits" or "license" for more information.
> >>  import gmpy
> >>  gmpy.version()
> >> > '1.11'
>
> >> > python gmpy_test.py
> >> > Unit tests for gmpy 1.11
> >> >    on Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
> >> > [GCC 4.2.1 (Apple Inc. build 5646)]
> >> > Testing gmpy 1.11 (GMP 4.3.1), default caching (100, 128)
> >> > gmpy_test_cvr 151 tests, 0 failures
> >> > .
> >> > .
> >> > .
> >> >  25 tests in gmpy_test_rnd.__test__.rand
> >> > 1469 tests in 42 items.
> >> > 1469 passed and 0 failed.
> >> > Test passed.
>
> >> > Looks like a viable gmpy module for 2.6.
>
> >> > What do I do AFTER I install Python 3.1? Just running python3.1 from
> >> > the
> >> > same directory doesn't work.
>
> >> > I've spent the last 5 days trying to figure that out. I hosed it so
> >> > bad
> >> > I somehow wrecked the 2.6 version to the point where it won't even
> >> > load.
>
> >> > I just got done doing a factory restore of the entire OS to undo
> >> > everything
> >> > I did. Re-did all the above and got it back working. Haven't re-
> >> > installed 3.1
> >> > yet.
>
> >> > Anbody have any idea how to make this work?
>
> >> Did you run setup.py with python3? Python 3.1 won't install itself as
> >> the default python install for compatibility reasons so you have to
> >> run "python3 install setup.py" to install it for that version of
> >> python.
>
> > I wondered why there was both python3 and python3.1 in the bin
> > directory.
>
> > But why, when I type...
>
> > $ python3
>
> > ...do I get...
>
> > Python 3.1.1 (r311:74543, Aug 24 2009, 18:44:04)
> > [GCC 4.0.1 (Apple Inc. build 5493)] on darwin
> > Type "help", "copyright", "credits" or "license" for more information.
>
> > [1]+  Stopped                 python3
>
> > I get the same result with python3.1.
>
> > So, no, trying python3 is of no help, same errors as before.
> > There's hundreds of them, but they start out
>
> > $ /Library/Frameworks/Python.framework/Versions/3.1/bin/python3
> > setup.py install
> > running install
> > running build
> > running build_ext
> > building 'gmpy' extension
> > creating build/temp.macosx-10.3-fat-3.1
> > creating build/temp.macosx-10.3-fat-3.1/src
> > Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/
> > MacOSX10.4u.sdk
> > Please check your Xcode installation
> > gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -
> > fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -O3 -I./src -I/
> > opt/local/include -I/Library/Frameworks/Python.framework/Versions/3.1/
> > include/python3.1 -c src/gmpy.c -o build/temp.macosx-10.3-fat-3.1/src/
> > gmpy.o
> > In file included from src/gmpy.c:206:
> > /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
> > Python.h:11:20: error: limits.h: No such file or directory
> > /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
> > Python.h:14:2: error: #error "Something's broken.  UCHAR_MAX should be
> > defined in limits.h."
> > /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
> > Python.h:18:
>
> > Any other ideas? Do I have to install a separate Python 3?
>
> That's not a Python 3 problem. It appears to be a problem in the build script.
>
> > Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/
> > MacOSX10.4u.sdk
>
> My guess would be you're on Snow Leopard

Yes, this machine has OS X 10.6.

> while the original developer
> is either on Tiger or Leopard. The script wants to use the 10.4 SDK
> but Apple only includes the SDKs for the latest 2 versions of OS X.

Is there any easy way to fix the build script? Is there a hard way?
Which files comprise the build script?

Thanks for your help.

>
>
>
>
>
> >> > --
> >> >http://mail.python.org/mailman/listinfo/python-list
>
> > --
> >http://mail.python.org/mailman/listinfo/python-list

-- 
http://mail.python.org/mailman/listinfo/python-list

Re: getlist question

[Benjamin Kaplan]

On Fri, Dec 25, 2009 at 12:40 PM, Victor Subervi
 wrote:
>
> It returns nothing. I believe I've stated that three times now.

In Python, that's not possible. Every function returns something. If
you think it returns nothing, it probably returns None.

>>> def foo() : pass
...
>>> a = foo()
>>> print a
None
-- 
http://mail.python.org/mailman/listinfo/python-list

Re: getlist question

[Carsten Haese]

Victor Subervi wrote:
> On Fri, Dec 25, 2009 at 11:35 AM, Carsten Haese  > wrote:
> 
> Victor Subervi wrote:
> > Well I've done that. What happens is the storeColNames registers the
> > "Availability" field naturally enough; however, as I stated
> before, the
> > getlist doesn't fetch anything because there is nothing to fetch! No
> > such value is passed!
> 
> Well, what does getlist return when the situation you're describing as
> "getlist doesn't fetch anything" occurs? Does is raise an exception?
> Does it return 0? Does it return None? Does it return an empty list? An
> empty string? An empty tuple? Does it return False? Does it not return
> at all and causes the universe to fall into a black hole?
> 
> 
> It returns nothing. I believe I've stated that three times now.

Bzzzt! Wrong! "Nothing" is not a Python object, and stating it three
times doesn't make it any less wrong. The result you're getting is a
Python object. It might represent Nothingness to you, but it's not
nothing. Try to find out what that object is, so that you can then use a
Python if-statement to check whether the return value you're getting is
such an object.

> 
>  So, what I need to do is figure out a way to log
> > the fact that no value is fetched. What I have currently,
> unfortunately,
> > simply ignores the unfetchable value. As I stated before, I need
> to log
> > the fact that no such value is obtained. Please...how do I do that??
> 
> Please be less vague. What part do you have a problem with? Checking
> whether "no value is fetched" or "log the fact"?
> 
> 
> No value is fetched because there is no value to fetch. I want to be
> able to log the fact that no value was fetched. How do I do that? Am I
> not being clear? Here, let me try again, as I began this thread with my
> first post. I thought it was so easy, so clear. If I use getfirst, I can
> set a default to log whether getfirst gets anything or not. I cannot do
> that with getlist. Is there a work-around?

See above. Try to find out what kind of object it does return in the
case that's causing you grief, and then devise a Python if-statement to
test for that object. Hint: Use type() and repr() to find out what
getlist() is returning.

--
Carsten Haese
http://informixdb.sourceforge.net

-- 
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Re: getlist question

[Victor Subervi]

On Fri, Dec 25, 2009 at 11:35 AM, Carsten Haese wrote:

> Victor Subervi wrote:
> > Well I've done that. What happens is the storeColNames registers the
> > "Availability" field naturally enough; however, as I stated before, the
> > getlist doesn't fetch anything because there is nothing to fetch! No
> > such value is passed!
>
> Well, what does getlist return when the situation you're describing as
> "getlist doesn't fetch anything" occurs? Does is raise an exception?
> Does it return 0? Does it return None? Does it return an empty list? An
> empty string? An empty tuple? Does it return False? Does it not return
> at all and causes the universe to fall into a black hole?
>

It returns nothing. I believe I've stated that three times now.

>
>  So, what I need to do is figure out a way to log
> > the fact that no value is fetched. What I have currently, unfortunately,
> > simply ignores the unfetchable value. As I stated before, I need to log
> > the fact that no such value is obtained. Please...how do I do that??
>
> Please be less vague. What part do you have a problem with? Checking
> whether "no value is fetched" or "log the fact"?
>

No value is fetched because there is no value to fetch. I want to be able to
log the fact that no value was fetched. How do I do that? Am I not being
clear? Here, let me try again, as I began this thread with my first post. I
thought it was so easy, so clear. If I use getfirst, I can set a default to
log whether getfirst gets anything or not. I cannot do that with getlist. Is
there a work-around?
TIA,
beno
-- 
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Re: Is it possible to get the erroneous variable when getting a NameError exception?

[Gary Herron]

Dotan Barak wrote:

Hi.

I'm trying to evaluate a string and getting a NameError
(it is expected, since the variable my_number wasn't provided in the 
"locals" dictionary).


<--snip start-->
>>> eval("my_number < 10", {"__builtins__":None}, {})
Traceback (most recent call last):
  File "", line 1, in ?
  File "", line 0, in ?
NameError: name 'my_number' is not defined
<--snip end-->

My question is: how can i know which variable name / symbol causes the 
NameError exception?

In my example, this symbol is my_number.

Using that information, I will be able to print a nice error message 
to the user.



Thanks
Dotan




Recover the exception, and examine the tuple of args or the message string.
>>> try:
... eval("my_number < 10", {"__builtins__":None}, {})
... except NameError,e:
... print e.args
... print e.message
...
("name 'my_number' is not defined",)
name 'my_number' is not defined

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Re: Is it possible to get the erroneous variable when getting a NameError exception?

[Steven D'Aprano]

On Fri, 25 Dec 2009 17:29:48 +0200, Dotan Barak wrote:

> Hi.
> 
> I'm trying to evaluate a string and getting a NameError (it is expected,
> since the variable my_number wasn't provided in the "locals"
> dictionary).
> 
> <--snip start-->
>  >>> eval("my_number < 10", {"__builtins__":None}, {})
> Traceback (most recent call last):
>File "", line 1, in ?
>File "", line 0, in ?
> NameError: name 'my_number' is not defined
> <--snip end-->
> 
> My question is: how can i know which variable name / symbol causes the
> NameError exception?
> In my example, this symbol is my_number.
> 
> Using that information, I will be able to print a nice error message to
> the user.

You mean just like the error message that Python already prints?

NameError: name 'my_number' is not defined

Don't waste your time re-inventing the wheel. But if you do insist on 
reinventing the wheel, here are some tools to help you:

try:
my_number
except NameError, e:
print str(e)
print type(e)
print e.args


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Re: getlist question

[Carsten Haese]

Victor Subervi wrote:
> Well I've done that. What happens is the storeColNames registers the
> "Availability" field naturally enough; however, as I stated before, the
> getlist doesn't fetch anything because there is nothing to fetch! No
> such value is passed!

Well, what does getlist return when the situation you're describing as
"getlist doesn't fetch anything" occurs? Does is raise an exception?
Does it return 0? Does it return None? Does it return an empty list? An
empty string? An empty tuple? Does it return False? Does it not return
at all and causes the universe to fall into a black hole?

 So, what I need to do is figure out a way to log
> the fact that no value is fetched. What I have currently, unfortunately,
> simply ignores the unfetchable value. As I stated before, I need to log
> the fact that no such value is obtained. Please...how do I do that??

Please be less vague. What part do you have a problem with? Checking
whether "no value is fetched" or "log the fact"?

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http://informixdb.sourceforge.net

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Is it possible to get the erroneous variable when getting a NameError exception?

[Dotan Barak]

Hi.

I'm trying to evaluate a string and getting a NameError
(it is expected, since the variable my_number wasn't provided in the 
"locals" dictionary).


<--snip start-->
>>> eval("my_number < 10", {"__builtins__":None}, {})
Traceback (most recent call last):
  File "", line 1, in ?
  File "", line 0, in ?
NameError: name 'my_number' is not defined
<--snip end-->

My question is: how can i know which variable name / symbol causes the 
NameError exception?

In my example, this symbol is my_number.

Using that information, I will be able to print a nice error message to 
the user.



Thanks
Dotan


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Re: How do I install GMPY 1.11 on a Mac with OS X 10.6 and Python 3.1?

[Benjamin Kaplan]

On Fri, Dec 25, 2009 at 1:48 AM, Mensanator  wrote:
> On Dec 24, 10:18 pm, Benjamin Kaplan  wrote:
>> On Thu, Dec 24, 2009 at 9:11 PM, Mensanator  wrote:
>> > Ok, so I got a MacBook Air.
>>
>> > Has OS X 10.6 (Snow Leopard) and Python 2.6.1 already installed.
>>
>> > So I install Xcode, download macports and download gmpy-1.11rc1.
>>
>> > Following the instructions in mac_build.txt, I do the following:
>>
>> > - sudo /opt/local/bin/port install gmp
>>
>> > This works fine.
>>
>> > Then I do
>>
>> > - python setup.py install
>>
>> > This also works (a few warnings, but nothing looked serious).
>>
>> > Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
>> > [GCC 4.2.1 (Apple Inc. build 5646)] on darwin
>> > Type "help", "copyright", "credits" or "license" for more information.
>>  import gmpy
>>  gmpy.version()
>> > '1.11'
>>
>> > python gmpy_test.py
>> > Unit tests for gmpy 1.11
>> >    on Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
>> > [GCC 4.2.1 (Apple Inc. build 5646)]
>> > Testing gmpy 1.11 (GMP 4.3.1), default caching (100, 128)
>> > gmpy_test_cvr 151 tests, 0 failures
>> > .
>> > .
>> > .
>> >  25 tests in gmpy_test_rnd.__test__.rand
>> > 1469 tests in 42 items.
>> > 1469 passed and 0 failed.
>> > Test passed.
>>
>> > Looks like a viable gmpy module for 2.6.
>>
>> > What do I do AFTER I install Python 3.1? Just running python3.1 from
>> > the
>> > same directory doesn't work.
>>
>> > I've spent the last 5 days trying to figure that out. I hosed it so
>> > bad
>> > I somehow wrecked the 2.6 version to the point where it won't even
>> > load.
>>
>> > I just got done doing a factory restore of the entire OS to undo
>> > everything
>> > I did. Re-did all the above and got it back working. Haven't re-
>> > installed 3.1
>> > yet.
>>
>> > Anbody have any idea how to make this work?
>>
>> Did you run setup.py with python3? Python 3.1 won't install itself as
>> the default python install for compatibility reasons so you have to
>> run "python3 install setup.py" to install it for that version of
>> python.
>
> I wondered why there was both python3 and python3.1 in the bin
> directory.
>
> But why, when I type...
>
> $ python3
>
> ...do I get...
>
> Python 3.1.1 (r311:74543, Aug 24 2009, 18:44:04)
> [GCC 4.0.1 (Apple Inc. build 5493)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.

> [1]+  Stopped                 python3
>
> I get the same result with python3.1.
>
> So, no, trying python3 is of no help, same errors as before.
> There's hundreds of them, but they start out
>
> $ /Library/Frameworks/Python.framework/Versions/3.1/bin/python3
> setup.py install
> running install
> running build
> running build_ext
> building 'gmpy' extension
> creating build/temp.macosx-10.3-fat-3.1
> creating build/temp.macosx-10.3-fat-3.1/src
> Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/
> MacOSX10.4u.sdk
> Please check your Xcode installation
> gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -
> fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -O3 -I./src -I/
> opt/local/include -I/Library/Frameworks/Python.framework/Versions/3.1/
> include/python3.1 -c src/gmpy.c -o build/temp.macosx-10.3-fat-3.1/src/
> gmpy.o
> In file included from src/gmpy.c:206:
> /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
> Python.h:11:20: error: limits.h: No such file or directory
> /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
> Python.h:14:2: error: #error "Something's broken.  UCHAR_MAX should be
> defined in limits.h."
> /Library/Frameworks/Python.framework/Versions/3.1/include/python3.1/
> Python.h:18:
>
> Any other ideas? Do I have to install a separate Python 3?
>

That's not a Python 3 problem. It appears to be a problem in the build script.

> Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/
> MacOSX10.4u.sdk

My guess would be you're on Snow Leopard while the original developer
is either on Tiger or Leopard. The script wants to use the 10.4 SDK
but Apple only includes the SDKs for the latest 2 versions of OS X.

>>
>>
>>
>> > --
>> >http://mail.python.org/mailman/listinfo/python-list
>
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Re: Extra fields for logging

[Steven D'Aprano]

On Thu, 24 Dec 2009 05:06:48 -0800, Joan Miller wrote:

> I'm trying to add some extra fields to logging, I'm following this
> information [1] but it faills in my case.
[...]
> I get => KeyError: 'host'

Please post the entire traceback you get.



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Re: Join a thread and get the return value of a function

[mattia]

Il Fri, 25 Dec 2009 05:19:46 +1100, Lie Ryan ha scritto:

> import threading
> 
> class MyThread(threading.Thread):
>  def join(self):
>  super(MyThread, self).join()
>  return self.result
> 
> class Worker(MyThread):
>  def run(self):
>  total = 0
>  for i in range(random.randrange(1, 10)):
>  total += i
>  self.result = total
> 
> import random
> ts = [Worker() for i in range(100)]
> for t in ts:
>  t.start()
> 
> for t in ts:
>  print t.join()

Thank you. And merry christmas!
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Re: Mechanize - Click a table row to navigate to detail page

[Diez B. Roggisch]

Brian D schrieb:

A search form returns a list of records embedded in a table.

The user has to click on a table row to call a Javascript call that
opens up the detail page.

It's the detail page, of course, that really contains the useful
information.

How can I use Mechanize to click a row?


You can't, if there is javascript involved. You can try & use Firebug to 
see what the javascript eventually calls, with which parameters. Then 
construct that url based on the parameters in the table row's javascript 
(which of course you have to parse yourself out of the code)


Diez
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Re: getlist question

[Victor Subervi]

On Thu, Dec 24, 2009 at 6:32 PM, MRAB  wrote:

> Victor Subervi wrote:
>
>  On Thu, Dec 24, 2009 at 3:28 PM, MRAB > pyt...@mrabarnett.plus.com>> wrote:
>>
>>Victor Subervi wrote:
>>
>>Hi;
>>I have the following code:
>>
>> try:
>>   trueVal = form.getlist(storeColNames[i])
>>   colNames.append(storeColNames[i])
>>   if len(trueVal) > 1:
>> trueVal = string.join(trueVal, ',')
>>
>>
>>Unless you're using a very old version of Python, you should be using
>>the string method:
>>
>> trueVal = ','.join(trueVal)
>>
>>
>> values.append(trueVal)
>>   elif len(trueVal) == 1:
>> print storeColNames[i], trueVal, ''
>> trueVal = '%s' % trueVal[0]
>> values.append(trueVal)
>>   if len(trueVal) > 0:
>> sql = '%s="%s"' % (storeColNames[i], trueVal)
>> sqlUpdate.append(sql)
>> except:
>>   raise
>>
>>This works fine except when storeColNames[i] returns no data.
>>Now, if I were dealing with getfirst instead of getlist, I could
>>easily put in a nonsense default data value such as '%$#' and
>>check for that. But how can I do that or something similar (and
>>preferably more elegant) with getlist, which takes only the one
>>name parameter?
>>
>>You just need to check whether len(trueVal) == 0. Simple.
>>
>>
>> The problem is that it doesn't see the value at all
>>
>>trueVal = form.getlist(storeColNames[i])
>>test = ','.join(trueVal)
>>if len(test) == 0:
>>  trueVal == ''
>>  It simply doesn't register storeColNames[i] if there is nothing provided
>> from the referring page. Here's a test printout:
>>
>>  [snip]
>
>  You can see from the above part with breaks that "Availability" isn't
>> logged. But it is in the insert statement...without a value, which throws an
>> error. The complete code follows:
>>
>>  [snip]
> Try working through the code by hand for that value.


Well I've done that. What happens is the storeColNames registers the
"Availability" field naturally enough; however, as I stated before, the
getlist doesn't fetch anything because there is nothing to fetch! No such
value is passed! So, what I need to do is figure out a way to log the fact
that no value is fetched. What I have currently, unfortunately, simply
ignores the unfetchable value. As I stated before, I need to log the fact
that no such value is obtained. Please...how do I do that??
TIA,
beno
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