On 28Jan2023 18:55, Jach Feng wrote:
Mark Bourne 在 2023年1月28日 星期六晚上10:00:01 [UTC+8] 的信中寫道：
I notice you explain the need to enclose the equation in quotes if it
contains spaces. That's not even a feature of your application, but of
the shell used to call it. So why so much objection to
On 1/28/2023 2:50 PM, Johannes Bauer wrote:
Am 28.01.23 um 02:51 schrieb Thomas Passin:
This is literally the version I described myself, except using triple
quotes. It only modifies the underlying problem, but doesn't solve it.
Ok, so now we are in the territory of "Tell us what you are
On Sun, 29 Jan 2023 at 14:29, Jach Feng wrote:
> Thank you for detail explanation of the role the shell is involved in this
> problem. I'm very appreciated!
>
> It seems that a CLI app may become very complex when dealing with different
> kind of shell, and may not be possible to solve its
On Sun, 29 Jan 2023 at 14:36, Stefan Ram wrote:
>
> Johannes Bauer writes:
> >I have a string. I want to evaluate it as if it were an f-string. I.e.,
> >there *are* obviously restrictions that apply (namely, the syntax and
> >semantics of f-strings), but that's it.
>
> (This message was
Jack,
I get uneasy when someone thinks a jackhammer is a handy dandy tool for pushing
in a thumbtack that is sitting on my expensive table.
I agree it is quite easy to grab some code that does lot of things and also
does something truly minor, and use it for that purpose. Sometimes the cost is
Jon Ribbens writes:
> On 2023-01-29, Ben Bacarisse wrote:
>> "Peter J. Holzer" writes:
>>
>>> On 2023-01-27 21:04:58 +, Ben Bacarisse wrote:
mutt...@dastardlyhq.com writes:
> Hi
It looks like you posted this question via Usenet. comp.lang.python is
On 2023-01-29, Ben Bacarisse wrote:
> "Peter J. Holzer" writes:
>
>> On 2023-01-27 21:04:58 +, Ben Bacarisse wrote:
>>> mutt...@dastardlyhq.com writes:
>>>
>>> > Hi
>>>
>>> It looks like you posted this question via Usenet. comp.lang.python is
>>> essentially dead as a Usenet group. It
"Peter J. Holzer" writes:
> On 2023-01-27 21:04:58 +, Ben Bacarisse wrote:
>> mutt...@dastardlyhq.com writes:
>>
>> > Hi
>>
>> It looks like you posted this question via Usenet. comp.lang.python is
>> essentially dead as a Usenet group. It exists, and gets NNTP versions
>> of mail sent
Mark Bourne 在 2023年1月28日 星期六晚上10:00:01 [UTC+8] 的信中寫道：
> Jach Feng wrote:
> > Jach Feng 在 2023年1月22日 星期日上午11:11:22 [UTC+8] 的信中寫道：
> >> Fail on command line,
> >>
> >> e:\Works\Python>py infix2postfix.py "-4^2+5.3*abs(-2-1)/2"
> >> usage: infix2postfix.py [-h] [infix]
> >> infix2postfix.py:
On Sun, 29 Jan 2023 at 12:07, Chris Green wrote:
>
> Chris Green wrote:
> > Jon Ribbens wrote:
> > > On 2023-01-28, Peter J. Holzer wrote:
> > > > On 2023-01-27 21:04:58 +, Ben Bacarisse wrote:
> > > >> It looks like you posted this question via Usenet. comp.lang.python is
> > > >>
On Sun, 29 Jan 2023 at 11:56, Johannes Bauer wrote:
>
> Am 28.01.23 um 00:41 schrieb Chris Angelico:
> > On Sat, 28 Jan 2023 at 10:08, Rob Cliffe via Python-list
> > wrote:
> >>
> >> Whoa! Whoa! Whoa!
> >> I appreciate the points you are making, Chris, but I am a bit taken
> >> aback by such
On Sun, 29 Jan 2023 at 11:27, rbowman wrote:
>
> On Fri, 27 Jan 2023 21:35:11 -0800 (PST), Grant Edwards wrote:
>
> > In Unix shells, a return code of 0 is true and non-0 is false.
>
> That carries over to some C functions like strcmp() although it's more
> complex. strcmp() returns the value of
On Sat, 28 Jan 2023 20:07:44 +, Chris Green declaimed the
following:
>As far as I am aware the mirroring of the Python mailing list on
>comp.lan.python works perfectly. I love gmane! :-)
Is gmane's gmane.comp.python.general allowing posts to go through
again? I had to revert to
Chris Green wrote:
> Jon Ribbens wrote:
> > On 2023-01-28, Peter J. Holzer wrote:
> > > On 2023-01-27 21:04:58 +, Ben Bacarisse wrote:
> > >> It looks like you posted this question via Usenet. comp.lang.python is
> > >> essentially dead as a Usenet group. It exists, and gets NNTP versions
On Sun, 29 Jan 2023 at 11:53, Johannes Bauer wrote:
> I don't want to have to care about what quotation is used inside the
> string, as long as it could successfully evaluate using the f-string
> grammar.
>
Not possible. An f-string can contain other f-strings, and it is
entirely possible to use
Jon Ribbens wrote:
> On 2023-01-28, Peter J. Holzer wrote:
> > On 2023-01-27 21:04:58 +, Ben Bacarisse wrote:
> >> It looks like you posted this question via Usenet. comp.lang.python is
> >> essentially dead as a Usenet group. It exists, and gets NNTP versions
> >> of mail sent to the
Am 27.01.23 um 23:10 schrieb Christian Gollwitzer:
Am 27.01.23 um 21:43 schrieb Johannes Bauer:
I don't understand why you fully ignore literally the FIRST example I
gave in my original post and angrily claim that you solution works
when it does not:
x = { "y": "z" }
s = "-> {x['y']}"
Am 28.01.23 um 00:41 schrieb Chris Angelico:
On Sat, 28 Jan 2023 at 10:08, Rob Cliffe via Python-list
wrote:
Whoa! Whoa! Whoa!
I appreciate the points you are making, Chris, but I am a bit taken
aback by such forceful language.
The exact same points have already been made, but not listened
Am 28.01.23 um 02:51 schrieb Thomas Passin:
This is literally the version I described myself, except using triple
quotes. It only modifies the underlying problem, but doesn't solve it.
Ok, so now we are in the territory of "Tell us what you are trying to
accomplish". And part of that is why
On 2023-01-28, Peter J. Holzer wrote:
> On 2023-01-27 21:04:58 +, Ben Bacarisse wrote:
>> It looks like you posted this question via Usenet. comp.lang.python is
>> essentially dead as a Usenet group. It exists, and gets NNTP versions
>> of mail sent to the mailing list, but nothing posted
mutt...@dastardlyhq.com wrote:
On Sat, 28 Jan 2023 14:22:01 +1300
dn wrote:
Do you know about the Python REPL?
Haven't learnt the acronyms yet.
REPL stands for "Read Evaluate Print Loop". It basically refers to the
interactive interpreter, which reads input you type, evaluates it,
On 1/27/2023 9:37 AM, mutt...@dastardlyhq.com wrote:
Hi
This is probably a dumb newbie question but I've just started to learn
python3 and eval() isn't behaving as I'd expect in that it works for
some things and not others. eg:
eval("1+1")
2
eval("print(123)")
123
eval("for i in
On Sat, 28 Jan 2023 14:22:01 +1300
dn wrote:
>On 28/01/2023 05.37, mutt...@dastardlyhq.com wrote:
>> This is probably a dumb newbie question but I've just started to learn
>> python3 and eval() isn't behaving as I'd expect in that it works for
>> some things and not others. eg:
>>
>
On Fri, 27 Jan 2023 21:04:58 +
Ben Bacarisse wrote:
>mutt...@dastardlyhq.com writes:
>
>> Hi
>
>It looks like you posted this question via Usenet. comp.lang.python is
>essentially dead as a Usenet group. It exists, and gets NNTP versions
>of mail sent to the mailing list, but nothing posted
On Sat, 28 Jan 2023 15:30:59 +0100, "Peter J. Holzer"
declaimed the following:
>On 2023-01-27 21:04:58 +, Ben Bacarisse wrote:
>> mutt...@dastardlyhq.com writes:
>>
>> > Hi
>>
>> It looks like you posted this question via Usenet. comp.lang.python is
>> essentially dead as a Usenet group.
Jach Feng 在 2023年1月22日 星期日上午11:11:22 [UTC+8] 的信中寫道：
> Fail on command line,
>
> e:\Works\Python>py infix2postfix.py "-4^2+5.3*abs(-2-1)/2"
> usage: infix2postfix.py [-h] [infix]
> infix2postfix.py: error: unrecognized arguments: -4^2+5.3*abs(-2-1)/2
>
> Also fail in REPL,
>
>
Jach Feng wrote:
Jach Feng 在 2023年1月22日 星期日上午11:11:22 [UTC+8] 的信中寫道：
Fail on command line,
e:\Works\Python>py infix2postfix.py "-4^2+5.3*abs(-2-1)/2"
usage: infix2postfix.py [-h] [infix]
infix2postfix.py: error: unrecognized arguments: -4^2+5.3*abs(-2-1)/2
Also fail in REPL,
you have your reasons, and I was tempted to stop there, but... I have to
pick this...
On 1/26/2023 10:09 PM, avi.e.gr...@gmail.com wrote:
You can often borrow
ideas and code from an online search and hopefully cobble "a" solution
together that works well enough. Of course it may suddenly
On Fri, 27 Jan 2023 21:35:11 -0800 (PST), Grant Edwards wrote:
> In Unix shells, a return code of 0 is true and non-0 is false.
That carries over to some C functions like strcmp() although it's more
complex. strcmp() returns the value of subtracting the nth character of
string b from string a
On 29/01/2023 09.28, Chris Angelico wrote:
The REAL boolean is the friends we made along the way?
By REAL did you mean float - True or False?
(for the FORTRAN-free: https://fortranwiki.org/fortran/show/real)
--
--
Regards,
=dn
--
https://mail.python.org/mailman/listinfo/python-list
On Sun, 29 Jan 2023 at 04:33, wrote:
> The right answer is that the question is too simple. It is what YOU want it
> to be in your situation. And it is also what the LANGUAGE designers and
> implementers have chosen within their domain.
The REAL boolean is the friends we made along the way?
If someone really really wants a non-int Boolean, it is easy to implement. 5 or
6 lines, depending on whether you count the import statement:
from enum import Enum
class MyBool(Enum):
TRUE = 42
FALSE = 54
def __bool__(self):
return self == MyBool.TRUE
#
# testing
#
The Unix convention is 0 means everything went well, and non-zero means
something else happened. Here’s a contrived example of a bash wrapper around
GNU tar. By contrived I mean it works but I would not use it in practice … I’d
just use tar directly or use the Python tarfile module if I wanted
The topic has somewhat modified to asking what is a BOOLEAN.
The right answer is that the question is too simple. It is what YOU want it
to be in your situation. And it is also what the LANGUAGE designers and
implementers have chosen within their domain.
Mathematically, as part of
On 2023-01-27 21:04:58 +, Ben Bacarisse wrote:
> mutt...@dastardlyhq.com writes:
>
> > Hi
>
> It looks like you posted this question via Usenet. comp.lang.python is
> essentially dead as a Usenet group. It exists, and gets NNTP versions
> of mail sent to the mailing list, but nothing
On 2023-01-27 21:31:05 +0100, Johannes Bauer wrote:
> > But if you really REALLY know what you're doing, just use eval()
> > directly.
>
> I do, actually, but I hate it. Not because of the security issue, not
> because of namespaces, but because it does not reliably work:
>
> >>> s = "{\"x\" *
On 2023-01-27 21:43:09 +0100, Johannes Bauer wrote:
> x = { "y": "z" }
> s = "-> {x['y']}"
> print(s.format(x = x))
> Traceback (most recent call last):
> File "", line 1, in
> KeyError: "'y'"
>
> This. Does. Not. Work.
>
> I want to pass a single variable as a dictionary and access its
On 2023-01-27 20:56:49 -0500, Thomas Passin wrote:
> On 1/27/2023 5:10 PM, Christian Gollwitzer wrote:
> > Am 27.01.23 um 21:43 schrieb Johannes Bauer:
> > > x = { "y": "z" }
> > > s = "-> {x['y']}"
> > > print(s.format(x = x))
> > > Traceback (most recent call last):
> > > File "", line 1, in
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