val(b)
True
>>> from ast import literal_eval
>>> literal_eval(b)
ValueError: malformed node or string: <_ast.Compare object at ...>
Is there a safe way to do what I want? I am using python 3.3.
Thanks
Frank Millman
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[Corrected top-posting]
>> To: python-list@python.org
From: fr...@chagford.com
Subject: Question about ast.literal_eval
Date: Mon, 20 May 2013 09:05:48 +0200
Hi all
I am trying to emulate a SQL check constraint in Python. Quoting from
the PostgreSQL docs, "A check constraint is the most generi
On 20/05/2013 09:55, Chris Angelico wrote:
On Mon, May 20, 2013 at 5:50 PM, Frank Millman wrote:
On 20/05/2013 09:34, Carlos Nepomuceno wrote:
Why don't you use eval()?
Because users can create their own columns, with their own constraints.
Therefore the string is user-modifiable,
On 20/05/2013 09:55, Carlos Nepomuceno wrote:
Why don't you use eval()?
Because users can create their own columns, with their own constraints.
Therefore the string is user-modifiable, so it cannot be trusted.
I understand your motivation but I don'
On 20/05/2013 10:07, Frank Millman wrote:
On 20/05/2013 09:55, Chris Angelico wrote:
Is it a requirement that they be able to key in a constraint as a
single string? We have a similar situation in one of the systems at
work, so we divided the input into three(ish) parts: pick a field,
pick an
On 21/05/2013 04:39, matt.newvi...@gmail.com wrote:
You might find the asteval module (https://pypi.python.org/pypi/asteval) useful. It
provides a relatively safe "eval", for example:
>>> import asteval
>>> a = asteval.Interpreter()
>>> a.eval('x = "abc"')
>>> a.eval('x i
On 20/05/2013 18:12, Steven D'Aprano wrote:
On Mon, 20 May 2013 15:26:02 +0200, Frank Millman wrote:
Can anyone see anything wrong with the following approach. I have not
definitely decided to do it this way, but I have been experimenting and
it seems to work.
[...]
It seems safe to m
On 20/05/2013 18:13, Chris Angelico wrote:
On Mon, May 20, 2013 at 11:26 PM, Frank Millman wrote:
0 - for the first entry in the list, the word 'check' (a placeholder - it is
discarded at evaluation time), for any subsequent entries the word 'and' or
'or'.
1
On 21/05/2013 09:21, Steven D'Aprano wrote:
On Tue, 21 May 2013 08:30:03 +0200, Frank Millman wrote:
I am not sure I can wrap my mind around mixed 'and's, 'or's, and
brackets.
Parsers are a solved problem in computer science, he says as if he had a
clue what h
or no difference whether
the client side is running a web browser or a traditional gui interface. On
a WAN, there could be a latency problem. Ideally an application should be
capable of servicing a local client or a remote client, so it is not easy to
find the right balance.
Do you have strong
"Chris Angelico" wrote in message
news:CAPTjJmo+fWsCD3Lb6s+zmWspKzzk_JB=pbcvflbzjgcfxvm...@mail.gmail.com...
> On Thu, Jun 13, 2013 at 7:32 PM, Frank Millman wrote:
>> I am talking about what I call 'field-by-field validation'. Each field
>> could
>> h
"Chris Angelico" wrote in message
news:captjjmq_m4y0uxxt3jqythjj9ckbsvp+z2pgf5v_31xlrgf...@mail.gmail.com...
> On Fri, Jun 14, 2013 at 3:39 PM, Frank Millman wrote:
>>
>> In my case, it is either-or. I do not just do field-by-field validation,
>> I
>> do
elf._del = DelWatcher(self)
Now you can watch the objects as they are created, and then check that they
are deleted when you expect them to be.
This can help to pinpoint where the memory leak is occurring.
HTH
Frank Millman
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ssion instance.
When any of them need any database access, whether for reading or for
updating, they execute the following -
with db_session as conn:
conn.transaction_active = True # this line must be added if
updating
conn.cur.execute(__whatever__)
Now it 'just works'. I don't have the need for save-points - either all
updates happen, or none of them do.
Frank Millman
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"Chris Angelico" wrote in message
news:captjjmr4mr0qcgwqxwyvdcz55nuav79vbtt8bjndsdvhrkq...@mail.gmail.com...
> On Tue, Jul 9, 2013 at 5:35 PM, Frank Millman wrote:
>> I have been following this sub-thread with interest, as it resonates with
>> what I am doing in my pr
"Ian Kelly" wrote in message
news:CALwzid=fzgjpebifx1stdbkh8iwltwggwwptphz1ykyg+05...@mail.gmail.com...
> On Tue, Jul 9, 2013 at 1:35 AM, Frank Millman wrote:
>> When any of them need any database access, whether for reading or for
>> updating, they execute the f
"Ian Kelly" wrote in message
news:calwzidnf3obe0enf3xthlj5a40k8hxvthveipecq8+34zxy...@mail.gmail.com...
> On Tue, Jul 9, 2013 at 10:07 AM, Ethan Furman wrote:
>> You could also do it like this:
>>
>> def updating(self):
>> self.transaction_active = True
>> return self
>
> Ye
"Ian Kelly" wrote in message
news:calwzidk2+b5bym5b+xvtoz8lheyvhcos4v58f8z2o1jb6sa...@mail.gmail.com...
> On Tue, Jul 9, 2013 at 11:54 PM, Frank Millman wrote:
>> You had me worried there for a moment, as that is obviously an error.
>>
>> Then I checked my act
I can hack my program to use tobytes(), but it would add complication, and
it would be database-specific. I would prefer a cleaner solution.
Does anyone have any suggestions?
Versions - Python: 3.3.2 PostgreSQL: 9.2.4 psycopg2: 2.5
Frank Millman
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"Antoine Pitrou" wrote in message
news:loom.20130731t114936-...@post.gmane.org...
> Frank Millman chagford.com> writes:
>>
>> I have some binary data (a gzipped xml object) that I want to store in a
>> database. For PostgreSQL I use a column with datatype
"Antoine Pitrou" wrote in message
news:loom.20130731t150154-...@post.gmane.org...
> Frank Millman chagford.com> writes:
>>
>> Thanks for that, Antoine. It is an improvement over tobytes(), but i am
>> afraid it is still not ideal for my purposes.
>
> I w
works.
So now I am confused.
1. Why do I get the traceback?
2. Can I rely on using weakref.ref, or does that also have some problem
that has just not appeared yet?
Any advice will be appreciated.
BTW, I am using python 3.2.2.
Thanks
Frank Millman
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On 05/07/2012 10:46, Dieter Maurer wrote:
Frank Millman writes:
I have a situation where I thought using weakrefs would save me a bit
of effort.
Instead of the low level "weakref", you might use a "WeakKeyDictionary".
Thanks, Dieter. I could do that.
In fact, a WeakS
On 05/07/2012 19:47, Dieter Maurer wrote:
Frank Millman writes:
I would still like to know why weakref.proxy raised an exception. I
have re-read the manual several times, and googled for similar
problems, but am none the wiser.
In fact, it is documented. Accessing a proxy will raise an
On 06/07/2012 20:12, Ethan Furman wrote:
Ian Kelly wrote:
def del_b(self, b):
for i, x in enumerate(self.array):
if b is x:
del self.array[i]
break
Nice work, Ian.
I second that. Thanks very much, Ian.
Frank
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is saying that he would have preferred that python
standardise on 4-byte characters, on the grounds that the saving in
memory does not justify the performance overhead.
Frank Millman
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f, ...):
[...]
def func2(self, ...):
[...]
AFTER
=
setup.py -
def setup1(self, ...):
[...]
def setup2(self, ...):
[...]
main.py -
import setup
class MyClass:
setup1 = setup.setup1
setup2 = setup.setup2
def func1(self, ...):
[...]
def fun
name) = LOWER(%s), and it will
use the index, so it is not necessary to coerce the data to lower case
before storing.
Frank Millman
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th in
the last month.
[...]
py2exe: A distutils extension to create standalone Windows programs from
python scripts.
It is 19th on a list of 19, but still, it is nice to see. I wonder if
there was any particular reason for that?
Frank Millman
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think is correct - there are 4 dots in the original string.
HTH
Frank Millman
--
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d it, you want to do something and break. If you do not find it, you
want to do something else.
for item in iterable:
if item == 'something':
do_something()
break
else: # item was not found
do_something_else()
Not arguing for or against, just saying it is di
On 26/01/2013 18:41, BV BV wrote:
DOES GOG EXIST
http://www.youtube.com/watch?v=tRMmTbCXXAk&feature=related
THANK YOU
Did you hear about the dyslexic agnostic insomniac?
He lies awake at night wondering if there is a dog.
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depth of more
than 4 or 5, so I can live with it.
However, it is not pretty. I wondered if anyone can suggest a more
elegant solution.
Thanks
Frank Millman
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py -
import test2
class Foo:
long_method_1 = test2.long_method_1
long_method_2 = test2.long_method_2
Then in Foo I can refer to self.long_method_1().
HTH
Frank Millman
--
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it in the blink of an eye. It also outputs a full trace
of the reasoning it used to arrive at a solution.
Frank Millman
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f that makes any difference.
Any advice will be appreciated.
Frank Millman
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"Frank Millman" wrote in message
news:jid2a9$n21$1...@dough.gmane.org...
> Hi all
>
> I seem to have a recurring battle with circular imports, and I am trying
> to nail it once and for all.
>
[...]
>
> The second solution is -
>
> in formats/__init__.py
&
"Peter Otten" <__pete...@web.de> wrote in message
news:jid424$vfp$1...@dough.gmane.org...
> Frank Millman wrote:
>
>
> To cut a long story short, why should circular imports be unavoidable?
>
> Paths into packages are recipe for desaster. You may end up wit
>
> To avoid the tedious reference, follow this with
> read = sound.formats.wavread # choose the identifier you prefer
>
@Terry and OKB
I tried that, but it does not work.
a.py
/b
__init__.py
c.py
d.py
a.py -
from b import c
c.py -
import b.d
d.py -
import b.c
If I run a
hen place calls on it directly.
I did a quick test and it seems to work. Is this a good idea, or are there
any downsides?
Thanks
Frank Millman
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"Frank Millman" wrote in message
news:jii0vo$36t$1...@dough.gmane.org...
> Hi all
>
> This is a follow-up to my recent question about circular imports, but on a
> different subject, hence the new thread.
>
[...]
>
> If this makes sense, my next thought was,
ported twice under different
names, with potentially disastrous consequences.
Therefore, as I see it, if you are developing a project using scenario 1
above, and then want to change it to scenario 2, you have to go through the
entire project and change all import references by prepending the package
name.
Have I got this right?
Frank Millman
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- the digits 0 to 4 displayed
with delays of 1 second.
Running sub_proc2 gives exactly the same output.
This is using python 3.2.2 on Windows Server 2003.
Frank Millman
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also works, and does not reload the module.
So my question is, is there any practical difference between the two
approaches? What about 'There should be one-- and preferably only
one --obvious way to do it'?
Frank Millman
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is -
microseconds = int('{:0<6}'.format(timepart_full[1]))
Any chance of this being accepted?
Frank Millman
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OE, so
they are being accepted. I send to the group gmane.comp.python.general.
Does anyone know a reason for this, or have a solution?
Frank Millman
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On Apr 30, 8:20 am, Frank Millman wrote:
> Hi all
>
> For a while now I have been using Google Groups to read this group, but on
> the odd occasion when I want to post a message, I use Outlook Express, as I
> know that some people reject all messages from Google Groups due to t
out of cookie use, now web site operators
need to ask for permission before they implement any cookies. So the opt out
system has been replaced with an opt in system.
Enjoy
Frank Millman
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reading.Thread(target=read_stdout, args=(sql_stdout,)).start()
s.seek(0)
sql_stdin.writelines(s.readlines())
s.close()
sql_stdin.close()
HTH
Frank Millman
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rst, it does work -
int(float(x))
165
Is there a short cut, or must I do this every time (I have lots of them!) ?
I know I can write a function to do this, but is there anything built-in?
Thanks
Frank Millman
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On Jul 21, 11:47 am, Leo Jay wrote:
> On Thu, Jul 21, 2011 at 5:31 PM, Frank Millman wrote:
>
> > Hi all
>
> > I want to convert '165.0' to an integer.
>
> > The obvious method does not work -
>
> >>>> x = '165.0'
> >&g
On Jul 21, 11:53 am, Thomas Jollans wrote:
> On 21/07/11 11:31, Frank Millman wrote:
>
> > Hi all
>
> > I want to convert '165.0' to an integer.
>
> Well, it's not an integer. What does your data look like? How do you
> wish to convert it to int?
>
> [1] See separate thread on apparent inconsisteny in timeit timings.- Hide
> quoted text -
>
I must have done something wrong - it is consistent now.
Here are the results -
C:\Python32\Lib>timeit.py "int(float('165.0'))"
10 loops, best of 3: 3.51 usec per loop
C:\Python32\Lib>timeit.py
On Jul 21, 10:00 pm, Terry Reedy wrote:
> On 7/21/2011 10:13 AM, Grant Edwards wrote:
>
> > On 2011-07-21, Web Dreamer wrote:
> >> Leo Jay a ?crit ce jeudi 21 juillet 2011 11:47 dans
>
> >> int(x.split('.')[0])
>
> >> But, the problem is the same as with int(float(x)), the integer number is
> >>
("165.0"))'
1000 loops, best of 3: 0.0887 usec per loop
I ran them both twice just to be sure.
The first two use double-quote marks to surround the statement, and
single-quote marks to surround the literal inside the statement.
The second two swap the quote marks around.
On Jul 22, 8:37 am, Stefan Behnel wrote:
> Frank Millman, 22.07.2011 08:06:
>
>
>
>
>
> > I mentioned in a recent post that I noticed an inconsistency in timeit, and
> > then reported that I must have made a mistake.
>
> > I have now identified my prob
On Jul 22, 10:34 am, Stefan Behnel wrote:
> Thomas Rachel, 22.07.2011 10:08:
>
>
>
>
>
> > Am 22.07.2011 08:59 schrieb Frank Millman:
>
> >> My guess is that it is something to do with the console, but I don't
> >> know what. If I get time over t
On Jul 22, 2:43 pm, Thomas Jollans wrote:
> On 22/07/11 14:30, Frank Millman wrote:
>
>
>
>
>
> > This is what I get after modifying timeit.py as follows -
>
> > if args is None:
> > args = sys.argv[1:]
> > + print(args)
>
> &
On Jul 22, 9:59 pm, Terry Reedy wrote:
> On 7/22/2011 1:55 AM, Frank Millman wrote:
>
> > As the OP, I will clarify what *my* requirement is. This discussion
> > has gone off at various tangents beyond what I was asking for.
>
> Typical. Don't worry about it ;-).
&
On Jul 23, 9:42 am, Chris Angelico wrote:
> On Sat, Jul 23, 2011 at 4:53 PM, Frank Millman wrote:
> > The problem with that is that it will silently ignore any non-zero
> > digits after the point. Of course int(float(x)) does the same, which I
> > had overlooked.
>
>
On Jul 23, 10:23 am, Steven D'Aprano wrote:
> Frank Millman wrote:
> > To recap, the original problem is that it would appear that some third-
> > party systems, when serialising int's into a string format, add a .0
> > to the end of the string. I am trying
On Jul 23, 5:12 pm, Billy Mays wrote:
> On 7/23/2011 3:42 AM, Chris Angelico wrote:
>
>
>
> > int(s.rstrip('0').rstrip('.'))
>
> Also, it will (in?)correct parse strings such as:
>
> '16500'
>
> to 165.
>
> --
> Bill
True enough.
If I really wanted to be 100% safe, how ab
On Jul 24, 9:34 am, Steven D'Aprano wrote:
> Frank Millman wrote:
> > If I really wanted to be 100% safe, how about this -
>
> > def get_int(s):
> > if '.' in s:
> > num, dec = s.split('.', 1)
> >
On Jul 24, 10:07 am, Chris Angelico wrote:
> On Sun, Jul 24, 2011 at 5:58 PM, Frank Millman wrote:
> > if int(dec) != 0:
> > to
> > if [_ for _ in list(dec) if _ != '0']:
>
> if dec.rtrim('0')!='':
>
> ChrisA
I think you mean
On Jul 23, 8:28 pm, rantingrick wrote:
> On Jul 23, 1:53 am, Frank Millman wrote:
>
> >--
> > The ideal solution is the one I sketched out earlier - modify python's
> > 'int' fu
On Jul 24, 10:53 am, Ben Finney wrote:
> Frank Millman writes:
> > I know I am flogging a dead horse here, but IMHO, '165', '165.',
> > '165.0', and '165.00' are all valid string representations of the
> > integer 165.[1]
>
&g
On Jul 25, 2:04 am, Gregory Ewing wrote:
> Frank Millman wrote:
> > I know I am flogging a dead horse here, but IMHO, '165', '165.',
> > '165.0', and '165.00' are all valid string representations of the
> > integer 165.[1]
>
Thanks, Paul and Peter.
It seemed like a good idea at the time.
Thank you for straightening me out.
Frank
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"John Machin" wrote:
On Feb 23, 7:47 pm, "Frank Millman" wrote:
[snip lots of valuable info]
The issue is not that 2to3 should handle this correctly, but that it
should
give a more informative error message to the unsuspecting user.
Your Python 2.x code should be TE
"Peter Otten" <__pete...@web.de> wrote
John Machin wrote:
Your Python 2.x code should be TESTED before you poke 2to3 at it. In
this case just trying to run or import the offending code file would
have given an informative syntax error (you have declared the .py file
to be encoded in UTF-8 but
"Christian Heimes" wrote
Am 24.02.2011 10:01, schrieb Peter Otten:
How do you prevent that a malicious source sends you
my_string = 'calc_area(__import__("os").system("rm important_file") or
100,
200)'
instead?
By using something like
http://code.activestate.com/recipes/496746-restricted
t works, but it seems to be defeating the purpose of PEP 328, which I
thought was an improvement.
Any comments or suggestions will be appreciated.
Frank Millman
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both windows
and linux. It works using python 2.6.
I can fix it by changing a.py from 'import b' to 'from . import b'.
As I understand it, the reason is that python 3.x will no longer look for an
absolute import in the current package - it will only look in sys.path.
Frank Millman
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"Ben Finney" wrote in message
news:87aahh6401@benfinney.id.au...
"Frank Millman" writes:
Assume the following structure -
main.py
/pkg
__init__.py
mod1.py
mod2.py
main.py
from pkg import mod1
mod1.py
import mod2
mod2.py
import mod1
What a
"人言落日是天涯，望极天涯不见家" wrote in message
news:fa94323b-d859-4599-b236-c78a22b3d...@t19g2000prd.googlegroups.com...
On Feb 27, 9:22 pm, "Frank Millman" wrote:
This behavior is by design or just a bug for Python3.x ?
Definitely by design.
Have a look at PEP 328 - http://www
"人言落日是天涯，望极天涯不见家" wrote in message
news:9529d52b-01b2-402c-a0a0-1e9240038...@l14g2000pre.googlegroups.com...
On Feb 27, 9:38 pm, "Frank Millman" wrote:
"人言落日是天涯，望极天涯不见家" wrote in message
news:fa94323b-d859-4599-b236-c78a22b3d...@t19g2000prd.googlegroup
"Steven D'Aprano" wrote in message
news:4d6a56aa$0$29972$c3e8da3$54964...@news.astraweb.com...
On Sun, 27 Feb 2011 12:08:12 +0200, Frank Millman wrote:
Assume the following structure -
main.py
/pkg
__init__.py
mod1.py
mod2.py
main.py
from pkg impor
t runs with no errors. I even put a couple of print statements
(or must I call them print functions now) into the modules being imported,
and the messages do appear, so the modules are being imported.
HTH
Frank Millman
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ot;' + session_id + b'"'))
It works, but it is not pretty. Is there a more elegant solution?
Thanks
Frank Millman
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On Mar 4, 6:40 pm, nn wrote:
> On Mar 4, 7:32 am, "Frank Millman" wrote:
>
> > Hi all
>
> > I want to create a cookie containing a session id. In python 2.6 I had the
> > following -
>
> > from __future__ import unicode_literals
> > session_id
"Rafael Durán Castañeda" wrote...
Thank you for your answer Frank, I think I've found the problem. I was
calling modules from inside subpackages, and I need to use them from
outside, so I have package in PYTHONPATH. is that correct? But now I have
another question: Can I execute an script insi
in the search path.
In your scripts you have to 'import' the package first, to ensure that these
lines get executed.
My 2c
Frank Millman
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Hi all
On linux, python 3.2 -
x = input()
xyz
len(x)
3
x
'xyz'
on windows, python 3.2 -
x = input()
xyz
len(x)
4
x
'xyz\r'
Is this expected behaviour?
Frank Millman
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"Peter Otten" <__pete...@web.de> wrote in message
news:iomla6$p8f$1...@dough.gmane.org...
Frank Millman wrote:
On linux, python 3.2 -
x = input()
xyz
len(x)
3
x
'xyz'
on windows, python 3.2 -
x = input()
xyz
len(x)
4
x
'xyz\r'
Is this ex
when you create your own class, you
can give it any attributes you like, and call them whatever you like.
If you changed 'payload' in the above to 'xyz', it would work exactly the
same.
Frank Millman
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, in new pence,
came to four figures. She then, talking to herself, did the next bit of the
calculation. 'Lets see, there are 100 new pence in a pound, so divide the
total by 100, ...'. She worked the whole thing out using just pencil and
paper, and then when she had written down the result, exclaimed 'Oh, it’s
the same!'.
Frank Millman
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.append(('a', 'b', 'c'))
x.append(('p', 'q', 'r'))
x
[('a', 'b', 'c'), ('p', 'q', 'r')]
Does this help?
Frank Millman
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0ZZZ sed do euismod tempor incididunt'
... ' ut labore et dolore magna aliqua.')
print(textwrap.fill(text, 59))
Lorum ipsum dolor sit amet, consectetur adipiscing elit
ZZZ ZZZ sed do euismod tempor incididunt ut labore et
dolore magna aliqua.
It seems to have been fixed.
Frank Millman
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por incididunt ut labore et dolore
magna aliqua.
C:\Users\User>py -3.6 aib\aib\test_db100.py
Lorum ipsum dolor sit amet, consectetur adipiscing elit
ZZZ ZZZ sed do euismod tempor incididunt ut labore et
dolore magna aliqua.
It confirms that the problem was there in 3.5, but is fixed in 3.6
T are necessary because it does not use indentation or
braces to terminate blocks, it uses keywords.
Frank Millman
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the program hangs.
If I add a timeout to the second one, it behaves the same as the first one.
Is there a reason for this?
I am using version 3.6.0.
Thanks
Frank Millman
import asyncio
from itertools import count
async def counter1():
cnt = count(1)
try:
while True
"Frank Millman" wrote in message news:ov5v3s$bv7$1...@blaine.gmane.org...
Below is a simple asyncio loop that runs two background tasks.
[...]
Both take an optional timeout.
If I use the first method without a timeout, the cancellation completes
and the loop stops.
If I use
"Ian Kelly" wrote in message
news:calwzidmrpfrr5mrejjyz+bdgtqlwy-sp+a_zc6zq7ebaz9g...@mail.gmail.com...
On Fri, Nov 24, 2017 at 6:31 AM, Frank Millman wrote:
> "Frank Millman" wrote in message news:ov5v3s$bv7$1...@blaine.gmane.org...
>
>> Below is a s
he 'while' loop?
If not, give it a shot and see what happens.
Frank Millman
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"Cai Gengyang" wrote in message
news:a8335d2c-1fb9-4ba9-b752-418d19e57...@googlegroups.com...
On Tuesday, November 28, 2017 at 4:18:04 PM UTC+8, Frank Millman wrote:
> "Cai Gengyang" wrote in message
> news:c2dfc9c4-3e16-480c-aebf-553081775...@googlegroups.com...
&g
7;.pgp'. He
did so, tried again, and said 'Ah, now it works'.
Frank Millman
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upon?
Thanks
Frank Millman
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"Peter Otten" wrote in message news:p31v3m$pji$1...@blaine.gmane.org...
Frank Millman wrote:
> Hi all
>
> I have read that one should not call dunder methods in application code.
>
> Does the same apply to dunder variables? I am thinking of the instance
> attr
"Frank Millman" wrote in message news:p321rb$9ct$1...@blaine.gmane.org...
"Peter Otten" wrote in message news:p31v3m$pji$1...@blaine.gmane.org...
Frank Millman wrote:
> Hi all
>
> I have read that one should not call dunder methods in application code.
>
"Steven D'Aprano" wrote in message news:p32g4v$v88$2...@blaine.gmane.org...
On Tue, 09 Jan 2018 11:28:03 +0200, Frank Millman wrote:
> I have a class call Context containing only data, not methods. Instances
> are passed around a lot in my application, with various method
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