On Tue, Nov 04, 2014 at 04:11:13PM +, Albert-Jan Roskam wrote:
> Hmm, I get 1900 occurrences of eval() (and 700 of frozenset, just
> curious) in Python. That's MUCH, I must be something wrong, but I am
> rushing now!
For what it's worth, in Python 2.7, and *only* looking at the top level
o
On 04/11/14 16:11, Albert-Jan Roskam wrote:
Hmm, I get 1900 occurrences of eval()
Try printing the filenames too. A lot of those will be
in Tkinter/Tix which uses tcl.eval() to execute the
underlying Tcl/Tk widget code. Also I suspect a lot of the
'introspection' type modules that are not int
- Original Message -
> From: Steven D'Aprano
> To: tutor@python.org
> Cc:
> Sent: Tuesday, November 4, 2014 4:08 AM
> Subject: Re: [Tutor] eval use (directly by interpreter vs with in a script)
>
> On Mon, Nov 03, 2014 at 09:33:18AM -0800, Albert-Jan Ros
On Mon, Nov 03, 2014 at 09:33:18AM -0800, Albert-Jan Roskam wrote:
> >Real question is what you're trying to do. eval() and exec() are to be
> >avoided if possible, so the solutions are not necessarily the easiest.
>
> I sometimes do something like
> ifelse = "'teddybear' if bmi > 30 else 'skin
On Sun, Nov 02, 2014 at 06:23:12PM -0500, Ken G. wrote:
> I use exec to jump to another program within the
> same directory, such as:
>
> execfile("BloodPressure02Sorting.py")
>
> and let the program terminate there. Should I do
> it differently or are you talking about a different
> horse?
Tha
On Mon Nov 03 2014 at 10:48:29 AM Danny Yoo wrote:
> On Mon Nov 03 2014 at 10:04:41 AM Alan Gauld
> wrote:
>
>> On 03/11/14 17:33, Albert-Jan Roskam wrote:
>>
>> > I sometimes do something like
>> > ifelse = "'teddybear' if bmi > 30 else 'skinny'"
>> > weightcats = [eval(ifelse) for bmi in bmis]
On Mon Nov 03 2014 at 10:04:41 AM Alan Gauld
wrote:
> On 03/11/14 17:33, Albert-Jan Roskam wrote:
>
> > I sometimes do something like
> > ifelse = "'teddybear' if bmi > 30 else 'skinny'"
> > weightcats = [eval(ifelse) for bmi in bmis]
> >
> > Would this also be a *bad* use of eval? It can be avoi
On 03/11/14 17:33, Albert-Jan Roskam wrote:
I sometimes do something like
ifelse = "'teddybear' if bmi > 30 else 'skinny'"
weightcats = [eval(ifelse) for bmi in bmis]
Would this also be a *bad* use of eval? It can be avoided, but this is so
concise.
eval etc are worst where the code to be ev
>
>Real question is what you're trying to do. eval() and exec() are to be
>avoided if possible, so the solutions are not necessarily the easiest.
I sometimes do something like
ifelse = "'teddybear' if bmi > 30 else 'skinny'"
weightcats = [eval(ifelse) for bmi in bmis]
Would this also be a *b
On 11/03/2014 12:37 AM, Danny Yoo wrote:
I use exec to jump to another program within the
same directory, such as:
execfile("BloodPressure02Sorting.py")
and let the program terminate there. Should I do
it differently or are you talking about a different
horse?
This is related.
Rather than u
> I use exec to jump to another program within the
> same directory, such as:
>
> execfile("BloodPressure02Sorting.py")
>
> and let the program terminate there. Should I do
> it differently or are you talking about a different
> horse?
This is related.
Rather than use execfile, you may want to c
On 11/02/2014 03:01 PM, Alex Kleider wrote:
I'm puzzled by the following behaviour:
The following works as I expect:
alex@x301:~/Python$ python3
Python 3.4.0 (default, Apr 11 2014, 13:05:18)
[GCC 4.8.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
code = """\
On Sun, Nov 2, 2014 at 3:07 PM, Peter Otten <__pete...@web.de> wrote:
> Inside a function there is no direct way to get access to the local
> namespace used by exec().
Indeed, exec() can't create new function locals, or even update the
values of existing function locals.
Another option for indire
On 2014-11-02 13:49, Danny Yoo wrote:
Are you just exploring the features of Python, or is there a
particular task you're trying to solve with eval or exec()? Perhaps
you can accomplish the same goal in another way?
Thank you and also Peter for your help.
The answer to your question is "'yes
On 11/02/2014 04:49 PM, Danny Yoo wrote:
Hi Alex,
Just as a side note, someone has probably already told you something
like this, but: I would strongly recommend not to use Python's eval()
or exec(). Those language features are dangerous. Every eval() or
exec() is a possible vector for injec
Hi Alex,
Just as a side note, someone has probably already told you something
like this, but: I would strongly recommend not to use Python's eval()
or exec(). Those language features are dangerous. Every eval() or
exec() is a possible vector for injection attacks. This week's
injection attack
Alex Kleider wrote:
> I'm puzzled by the following behaviour:
>
> The following works as I expect:
>
> alex@x301:~/Python$ python3
> Python 3.4.0 (default, Apr 11 2014, 13:05:18)
> [GCC 4.8.2] on linux
> Type "help", "copyright", "credits" or "license" for more information.
code = """\
> ..
I'm puzzled by the following behaviour:
The following works as I expect:
alex@x301:~/Python$ python3
Python 3.4.0 (default, Apr 11 2014, 13:05:18)
[GCC 4.8.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
code = """\
... s1 = 'first'
... s2 = 'second'
... """
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