Re: [C++-sig] With boost python tuple, how to loop over tuple items?
If I remember correctly there is a len() function on the boost::python::object class. len() is documented at the bottom of this page . . . https://www.boost.org/doc/libs/1_66_0/libs/python/doc/html/reference/object_wrappers/boost_python_object_hpp.html I can’t help with the ambiguity. From: Cplusplus-sig On Behalf Of HOUSSEN Franck Sent: Wednesday, January 29, 2020 1:02 PM To: cplusplus-sig@python.org Subject: [C++-sig] With boost python tuple, how to loop over tuple items? *** WARNING *** EXTERNAL EMAIL -- This message originates from outside our organization. With boost python tuple, how to loop over tuple items? In dummy.cpp attached, I'd like to get line 8 to work. Afterwards, I noticed line 7 does not even compile. How to get the length of a tuple (line 8), and, why there could be some ambiguity (line 7). Any help / clue is appreciated. Franck ___ Cplusplus-sig mailing list Cplusplus-sig@python.org https://mail.python.org/mailman/listinfo/cplusplus-sig
Re: [C++-sig] Getting simple boost.python extension to work outside the test scripts - HELP!
You may need to set PYTHONPATH. Search for PYTHONPATH on this page for a description. https://docs.python.org/3/using/cmdline.html From: Cplusplus-sig [mailto:cplusplus-sig-bounces+torrin.jones=baesystems@python.org] On Behalf Of Andrew Voelkel Sent: Wednesday, May 22, 2019 10:56 AM To: Development of Python/C++ integration Subject: [C++-sig] Getting simple boost.python extension to work outside the test scripts - HELP! *** WARNING *** EXTERNAL EMAIL -- This message originates from outside our organization. Hi, I spent most of yesterday trying to get the simple tutorials and example to build from within the Boost example folders, and finally succeeded. It was not super straightforward as the instructions seem incomplete and out of date. But after finding a tutorial on Boost.Build and understanding how it works, I was able to debug the build process and get the test scripts to run successfully. Now I'd like to move to Spyder and run simple tests on the extension. However, when I try to execute a simple "import hello_ext" statement, I get an error trying to locate a dependent library. No amount of setting paths seem to help. (I copied libboost_python37.dylib to /Users/andy before running this script. I'm on Mac OS Mojave Commands: import os print(os.environ['PATH']) os.environ['PATH'] += ':/Users/andy' os.environ['DYLD_LIBRARY_PATH'] = '/Users/andy' print(os.environ['PATH']) print(os.environ['DYLD_LIBRARY_PATH']) import hello_ext Output: /Users/andy/anaconda3/bin:/Users/andy/anaconda3/condabin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin /Users/andy/anaconda3/bin:/Users/andy/anaconda3/condabin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/andy /Users/andy Traceback (most recent call last): File "", line 7, in import hello_ext ImportError: dlopen(/Users/andy/Dropbox (Personal)/Developer/boost_1_70_0/libs/python/example/tutorial/hello_ext.so, 2): Library not loaded: libboost_python37.dylib Referenced from: /Users/andy/Dropbox (Personal)/Developer/boost_1_70_0/libs/python/example/tutorial/hello_ext.so Reason: image not found What magic is the boost environment performing to make this work? What can I do to make my python extensions look for libboost_python37.dylib in the location where it lives? Thanks in advance for any help! - Andy ___ Cplusplus-sig mailing list Cplusplus-sig@python.org https://mail.python.org/mailman/listinfo/cplusplus-sig
Re: [C++-sig] Python support in boost::python (what version)
What did you expect ? It's obvious that a given release of Boost.Python can not make any compatibility guarantees about future Python releases . . . What's your point, exactly ? What are you trying to do ? You're right. All I'm trying to do is gather information that I can submit and hopefully get approved. I would *hope* that Boost.Python 1.66.0 was compatible with Python 3.6.4 Agreed. That was just an example for illustration. Not a criticism. And since you made the point about the major and minor version of python and backward-compatibility that's something else for me to think about before I present something. Thanks for your help on this. From: Cplusplus-sig [mailto:cplusplus-sig-bounces+torrin.jones=baesystems@python.org] On Behalf Of Stefan Seefeld Sent: Monday, May 20, 2019 9:16 AM To: cplusplus-sig@python.org Subject: Re: [C++-sig] Python support in boost::python (what version) *** WARNING *** EXTERNAL EMAIL -- This message originates from outside our organization. On 2019-05-20 11:20 a.m., Jones, Torrin A (US) wrote: For clarity, my boss is asking, "what version of python does boost python support?" I was hoping there was some kind of table or something, but I guess the answer is something like, "It supports whatever version of python was out at the time that boost python was released?" And then we can go back and look at release dates. LOL. What did you expect ? It's obvious that a given release of Boost.Python can not make any compatibility guarantees about future Python releases, unless, of course, Python itself promises to be fully backward compatible. That's precisely why the versioning scheme used by Python supports the distinction between "major" and "minor" version, to be able to make statements as to what degree of backward-compatibility to expect. Ex: boost python 1.66.0 was released/tagged on Nov 17, 2017. Python 3.6.3 was released on Oct 3, 2017. Python 3.6.4 was released on Dec 19. 2017. So in theory boost python 1.66.0 has support for Python 3.6.3, but does not have support for Python 3.6.4. I know that's ludicrous but, I work in the corporate world so here we are. What's your point, exactly ? What are you trying to do ? (For the specific case, I would *hope* that Boost.Python 1.66.0 was compatible with Python 3.6.4, for the reason I cite above. But of course, there is no guarantee. Boost is Free Software, and its license (https://www.boost.org/users/license.html) clearly states that it is provided "...without warranty of any kind...". So make of it what you want.) [Stefan] -- ...ich hab' noch einen Koffer in Berlin... ___ Cplusplus-sig mailing list Cplusplus-sig@python.org https://mail.python.org/mailman/listinfo/cplusplus-sig
Re: [C++-sig] Python support in boost::python (what version)
Anything above version 2.2 OK, I understand what you are saying below, but there seems to be a little bit more to this . . . Example: This was fixed in boost-1.67.0. So in theory, nothing below boost python 1.67.0 supports Python 3.7. I guess I didn't ask about older versions of boost python though. https://github.com/boostorg/python/commit/660487c43fde76f3e64f1cb2e644500da92fe582 For clarity, my boss is asking, "what version of python does boost python support?" I was hoping there was some kind of table or something, but I guess the answer is something like, "It supports whatever version of python was out at the time that boost python was released?" And then we can go back and look at release dates. LOL. Ex: boost python 1.66.0 was released/tagged on Nov 17, 2017. Python 3.6.3 was released on Oct 3, 2017. Python 3.6.4 was released on Dec 19. 2017. So in theory boost python 1.66.0 has support for Python 3.6.3, but does not have support for Python 3.6.4. I know that's ludicrous but, I work in the corporate world so here we are. There isn't another question here, but if you have any other thoughts on this please reply. From: Cplusplus-sig [mailto:cplusplus-sig-bounces+torrin.jones=baesystems@python.org] On Behalf Of stefan Sent: Thursday, May 16, 2019 12:57 PM To: cplusplus-sig@python.org Subject: Re: [C++-sig] Python support in boost::python (what version) *** WARNING *** EXTERNAL EMAIL -- This message originates from outside our organization. On 2019-05-16 3:43 p.m., Jones, Torrin A (US) wrote: What version of python does boost::python officially support? Anything above version 2.2 I noticed in the python build file (see link below), it will only find from version 1.5 to 3.4. Does this mean that boost python really only supports up to 3.4? Folks do appear to be using other versions, but the fact that this only goes to 3.4 leads me to believe that is as far as it's been tested. Is that right? Definitely not. You are right, though: this file needs to be fixed. (I'm not maintaining this file myself, so I'll follow up with the relevant people (Boost.Build).) Boost internally regularly builds and tests Boost.Python with versions > 3.4. and I know various distributions containing Boost.Python packages built against more recent Python versions. See for example https://anaconda.org/anaconda/boost/files What are the official versions? Is there any documentation that says that? Not really, as Boost only "officially" releases source packages. Users are free to compile against a large range of tools and prerequisites (compilers, Python versions, etc.). If you find any issues building and running against a particular Python version, please file a bug report, and I'll try to help as quickly as possible. [Stefan] -- ...ich hab' noch einen Koffer in Berlin... ___ Cplusplus-sig mailing list Cplusplus-sig@python.org https://mail.python.org/mailman/listinfo/cplusplus-sig
[C++-sig] Python support in boost::python (what version)
What version of python does boost::python officially support? I noticed in the python build file (see link below), it will only find from version 1.5 to 3.4. Does this mean that boost python really only supports up to 3.4? Folks do appear to be using other versions, but the fact that this only goes to 3.4 leads me to believe that is as far as it's been tested. Is that right? What are the official versions? Is there any documentation that says that? https://github.com/boostorg/build/blob/develop/src/tools/python.jam#L401 ___ Cplusplus-sig mailing list Cplusplus-sig@python.org https://mail.python.org/mailman/listinfo/cplusplus-sig
Re: [C++-sig] Calling python function repr from C++ using boost.python (possible?)
This worked very well thanks.
-Original Message-
From: Stefan Ring [mailto:stefan...@gmail.com]
Sent: Tuesday, March 05, 2019 12:04 PM
To: Development of Python/C++ integration
Cc: Jones, Torrin A (US)
Subject: Re: [C++-sig] Calling python function repr from C++ using boost.python
(possible?)
*** WARNING ***
EXTERNAL EMAIL -- This message originates from outside our organization.
On Sat, Mar 2, 2019 at 6:12 PM Jones, Torrin A (US)
wrote:
>
> Is it possible to call repr from C++ on a C++ object that can be converted to
> python? Let me explain.
>
>
>
> I have an enum that I converted to python using boost::python::enum_(). That
> class already provides a good repr() to python (thanks to the boost::python
> developers for that). However that enum is used as a type on a member in
> another C++ class that I have where boost::python does not provide a good
> repr(). So I’m trying to provide one and thought, it sure would be nice if I
> could just call repr() on the member. I assume I have to convert the value
> on that member to python first, some kind of way then call repr? Is that
> possible? Or is there a better way?
>
>
>
> Example:
>
>
>
> Typedef enum
>
> {
>
>V1 = 0,
>
>V2 = 5,
>
>V3 = 6
>
> } values;
>
>
>
> Class ValueExample
>
> {
>
>Public:
>
> ValueExample(const values& v) {m_value = v};
>
> Values getValue() const { return m_value };
>
>Private:
>
> Values m_value;
>
> }
>
>
>
> Std::string
>
> ValueExampleRepr(const ValueExample& object)
>
> {
>
>Std::stringstream ss;
>
>
>
>// What do I put here?
>
>// Ss << repr(object.getValue());
>
>
>
>Return ss::str();
>
> }
>
>
>
> Boost::python::enum_ values(“values”);
>
> Values.value(“V1”, V1);
>
> Values.value(“V2”, V2);
>
> Values.value(“V3”, V3);
>
>
>
> Boost::python::class_ ValueExample(“ValueExample”);
>
>
>
> ValueExample(“__repr__”, ValueExampleRepr);
I can only come up with this:
Ss <<
extract(boost::python::object(object.getValue()).attr("__repr__")())();
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[C++-sig] Calling python function repr from C++ using boost.python (possible?)
Is it possible to call repr from C++ on a C++ object that can be converted to
python? Let me explain.
I have an enum that I converted to python using boost::python::enum_(). That
class already provides a good repr() to python (thanks to the boost::python
developers for that). However that enum is used as a type on a member in
another C++ class that I have where boost::python does not provide a good
repr(). So I'm trying to provide one and thought, it sure would be nice if I
could just call repr() on the member. I assume I have to convert the value on
that member to python first, some kind of way then call repr? Is that
possible? Or is there a better way?
Example:
Typedef enum
{
V1 = 0,
V2 = 5,
V3 = 6
} values;
Class ValueExample
{
Public:
ValueExample(const values& v) {m_value = v};
Values getValue() const { return m_value };
Private:
Values m_value;
}
Std::string
ValueExampleRepr(const ValueExample& object)
{
Std::stringstream ss;
// What do I put here?
// Ss << repr(object.getValue());
Return ss::str();
}
Boost::python::enum_ values("values");
Values.value("V1", V1);
Values.value("V2", V2);
Values.value("V3", V3);
Boost::python::class_ ValueExample("ValueExample");
ValueExample("__repr__", ValueExampleRepr);
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