Kyle Stanley writes:
> The behavior is the same on Python 3.8.2:
>
> Python 3.8.2 (default, Feb 26 2020, 22:21:03)
> [GCC 9.2.1 20200130] on linux
> Type "help", "copyright", "credits" or "license" for more information.
> >>> r'x\'y'
> "x\\'y"
This looks like a defect to me. The "'"
Christopher Barker writes:
> So [inf and -inf] are not "readable input, part of Python syntax",
> but they are part of the float API.
Thank you for the correction.
Aside: help(float) doesn't mention these aspects of the API. I guess
that since 1.0 / 0.0 doesn't return float("inf") and 0.0 /
On Mon, Mar 16, 2020, 1:04 AM Greg Ewing
wrote:
> On 16/03/20 2:27 pm, Christopher Barker wrote:
> > I imagine a LOT of code out there (doctests, who know
> > what else) does in fact expect the str() of builtins not to change -- so
> > this is probably dead in the water.
>
> Also, strs and reprs
On 16/03/20 2:27 pm, Christopher Barker wrote:
I imagine a LOT of code out there (doctests, who know
what else) does in fact expect the str() of builtins not to change -- so
this is probably dead in the water.
Also, strs and reprs of arbitrary objects often end up in places
such as log files
> On Mar 15, 2020, at 06:25, 1njecti...@gmail.com wrote:
>
> In other languages, there are built-in data structures with binary search
> tree semantics, as an example, std::map in C++.
There have been multiple past discussions on this, which you should search for
and read, but I can summarize
Steve Jorgensen wrote:
> Steve Jorgensen wrote:
> > Steve Jorgensen wrote:
> >
> > The problem I came up with trying to spike out
> > my
> > proposal last night is that there
> > doesn't seem to be anyway to implement it without creating infinite
> > recursion in the
> > issublcass call. If I
There are many variants of SQL. DB-API only solves for so much.
>From "[Python-ideas] Draft PEP on string interpolation" (=> f-strings)
https://groups.google.com/d/msg/python-ideas/6tfm3e2UtDU/8ugqbZtYAwAJ :
```quote
IIUC, to do this with SQL,
> sql(i'select {date:as_date} from {tablename}'
- CPython has __str__ and __repr__, IPython has obj._repr_fmt_(),
MarkupSafe has obj.__html__(),
https://github.com/tommikaikkonen/prettyprinter has @register_pretty
Neither __str__ nor __repr__ have any round-trip guarantee/expectation
(they're not suitable for serialization/deserialization //
On Sun, Mar 15, 2020 at 06:27:43PM -0700, Christopher Barker wrote:
> Anyway, Python now has two different ways to "turn this into a string":,
> __str__ and __repr__. I think the OP is suggesting a third, for "pretty
> version". But then maybe folks would want a fourth or fifth, or .
>
>
Christopher Barker wrote:
> Is there any guarantee (or even string expectation) that the __str__ for
an object won't change?
> [snip]
> *reality check*: I imagine a LOT of code out there (doctests, who know
what else) does in fact expect the str() of builtins not to change -- so
this is probably
On Sun, Mar 15, 2020 at 6:12 PM Stephen J. Turnbull <
turnbull.stephen...@u.tsukuba.ac.jp> wrote:
> Also, I'd like to note that "inf" and "-inf" (and "nan" for that
> matter) are not "informal". They are readable input, part of Python
> syntax:
>
> % python3.8
> Python 3.8.2 (default, Feb 27
Rob Cliffe wrote:
> Your docs link states "... they allow you to pass on the string quote
> character by escaping it with a backslash."
>
> I don't have access to a Python 3 version right now, but that is not
> true in Python 2:
> [snip]
The behavior is the same on Python 3.8.2:
Python 3.8.2
Jonathan Fine writes:
> However, you wrote "decide implicitly". Perhaps I'm missing something in
> the "implicitly".
That's shorthand for the long form I used later: "depending on
variable environment state" (such as encodings, user id, or sunspot
activity). Should have done it in the
On 3/15/2020 12:50 PM, Steve Jorgensen wrote:
Guido van Rossum wrote:
I think the idea you're looking for is an alternative for the pprint module
that allows classes to have formatting hooks that get passed in some
additional information (or perhaps a PrettyPrinter object) that can affect
the
On 2020-03-15 5:19 p.m., Chris Angelico wrote:
On Mon, Mar 16, 2020 at 7:14 AM Christopher Barker wrote:
> But back the python_ideas topic:
>
> It might be good to have a set of real, tree-based data structures -- they
are the best way to go for some use cases, and are non-trivial to
On Sun, 15 Mar 2020 at 20:27, Alex Hall wrote:
> How about http://www.grantjenks.com/docs/sortedcontainers/sorteddict.html
> ?
>
There's also Sorted Containers, that seems to be a mature project:
http://www.grantjenks.com/docs/sortedcontainers/index.html
On Mon, Mar 16, 2020 at 9:08 AM Rob Cliffe via Python-ideas
wrote:
>
>
> On 22/02/2020 06:26, Steven D'Aprano wrote:
> >
> > Actually, in Python, regexes are the primary reason raw strings were
> > added!
> >
> > Raw strings aren't quite fully raw, which is why you can't use raw
> > strings for
On 22/02/2020 06:26, Steven D'Aprano wrote:
Actually, in Python, regexes are the primary reason raw strings were
added!
Raw strings aren't quite fully raw, which is why you can't use raw
strings for Windows paths:
path = r'somewhere\some\folder\'
doesn't work. The reason is that "raw"
On Sun, Mar 15, 2020 at 1:20 PM Chris Angelico wrote:
> Recommendation: If anything is added to the standard library, it
> should be named according to its use-cases, not its implementation.
>
Agreed. Which is why I named my toy SortedMap :-)
However, what if we made another, e.g. Mapping,
On Mon, Mar 16, 2020 at 7:14 AM Christopher Barker wrote:
> But back the python_ideas topic:
>
> It might be good to have a set of real, tree-based data structures -- they
> are the best way to go for some use cases, and are non-trivial to implement
> well.
>
> (and yes, starting out at a third
On Sun, Mar 15, 2020 at 12:28 PM Alex Hall wrote:
> How about http://www.grantjenks.com/docs/sortedcontainers/sorteddict.html
> ?
>
For my part, I didn't look for that, as I was having fun playing around
with the idea. But yes, that looks like it would fit the bill.
And at a glance, they were
How about http://www.grantjenks.com/docs/sortedcontainers/sorteddict.html ?
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>
> > In other languages, there are built-in data structures with binary
> > search tree semantics, as an example, std::map in C++.
>
not being a C++ guy, I had no idea that std::map was a tree -- I always
figured it was a hashtable, but you learn something new every day.
As far as I know, there
Alex Hall wrote:
> Might be helpful to look at https://github.com/tommikaikkonen/prettyprinter
> and https://github.com/wolever/pprintpp
Right! Thx. :)
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Jonathan Fine wrote:
> Hi Steve (for clarity Jorgensen)
> Thank you for your good idea, and your enthusiasm. And I thank Guido, for
> suggesting a good contribution this list can make.
> Here's some comments on the state of the art. In addition to
> https://docs.python.org/3/library/pprint.html
>
Might be helpful to look at https://github.com/tommikaikkonen/prettyprinter
and https://github.com/wolever/pprintpp
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Hi Steve (for clarity Jorgensen)
Thank you for your good idea, and your enthusiasm. And I thank Guido, for
suggesting a good contribution this list can make.
Here's some comments on the state of the art. In addition to
https://docs.python.org/3/library/pprint.html
there's also
Hi Steve (for clarity Turnbull)
You wrote: Allowing objects to decide implicitly how to represent
themselves is usually a bad idea, and we shouldn't encourage it.
I'm puzzled. I thought that when I define a class X, I'm generally
encouraged to define a __repr__ method, that is used to decide how
Guido van Rossum wrote:
> I think the idea you're looking for is an alternative for the pprint module
> that allows classes to have formatting hooks that get passed in some
> additional information (or perhaps a PrettyPrinter object) that can affect
> the formatting.
> This would seem to be an
Steve Jorgensen writes:
> Encoding awareness:
>
> The informal (`str`) representations of `inf` and `-inf` are "inf"
> and "-inf", and that seems appropriate as a known-safe value, but
> if we're writing the representation to a stream, and the stream has
> a Unicode encoding, then those
I think the idea you're looking for is an alternative for the pprint module
that allows classes to have formatting hooks that get passed in some
additional information (or perhaps a PrettyPrinter object) that can affect
the formatting.
This would seem to be an ideal thing to try to design and put
On Sat, 14 Mar 2020 20:35:08 -
1njecti...@gmail.com wrote:
> In other languages, there are built-in data structures with binary
> search tree semantics, as an example, std::map in C++.
> By binary search tree semantics we mean the following:
> * We can insert elements into the structure in
In other languages, there are built-in data structures with binary search tree
semantics, as an example, std::map in C++.
By binary search tree semantics we mean the following:
* We can insert elements into the structure in time faster than O(n), i.e.
O(logn) for std::map
* We can iterate over
This is really an idea for an idea. I'm not sure what the ideal dunder method
names or APIs should be.
Encoding awareness:
The informal (`str`) representations of `inf` and `-inf` are "inf" and "-inf",
and that seems appropriate as a known-safe value, but if we're writing the
representation
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