#475 Newest Version Is Unable To Import Archive_load Function

[Jacob Turner]

I seem to not be able to load certain functions after the2023-01-24 version update. On my machine, when I run from psrchive import Archive_load I get ImportError: cannot import name 'Archive_load' from 'psrchive' (/opt/python/3.9/envs/pulsar/lib/python3.10/site-packages/psrchive.py) which was not happening in previous updates.

[Jacob Turner]

I should also mention that despite this I am able to run import psrchive just fine, but then the Archive_load function seems to be missing if I try to access it that way. When I run import psrchive; psrchive.Archive_load(filename) I get AttributeError: modile 'psrchive' has no attribute 'Archive_load'

[Paul Demorest]

hi Jacob, sorry for the trouble, I will take a look today. I assume you are using the conda-forge package?

[Jacob Turner]

Hi Paul,

Yes, that’s correct, we are using conda-forge.

Jacob

On Mon, Feb 13, 2023 at 11:07 Paul Demorest demorest@users.sourceforge.net
wrote:

hi Jacob, sorry for the trouble, I will take a look today. I assume you
are using the conda-forge package?

---

• [bugs:#475] https://sourceforge.net/p/psrchive/bugs/475/ Newest
  Version Is Unable To Import Archive_load Function *

Status: open
Group: next release
Created: Sat Feb 11, 2023 05:12 PM UTC by Jacob Turner
Last Updated: Sat Feb 11, 2023 05:26 PM UTC
Owner: nobody

I seem to not be able to load certain functions after the2023-01-24
version update. On my machine, when I run from psrchive import
Archive_load I get ImportError: cannot import name 'Archive_load' from
'psrchive'
(/opt/python/3.9/envs/pulsar/lib/python3.10/site-packages/psrchive.py)
which was not happening in previous updates.

---

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[Paul Demorest]

Just investigated a bit, it appears that psrchive.Archive.load() works with the new version in place of psrchive.Archive_load(). So that can be used as a short-term workaround. This is almost certainly due to a swig version change, I will work on making a new package that supports the previous syntax (either in place of or in addition to the new).

[Jacob Turner]

Got it. Thanks for checking!

On Mon, Feb 13, 2023 at 18:07 Paul Demorest demorest@users.sourceforge.net
wrote:

Just investigated a bit, it appears that psrchive.Archive.load() works
with the new version in place of psrchive.Archive_load(). So that can be
used as a short-term workaround. This is almost certainly due to a swig
version change, I will work on making a new package that supports the
previous syntax (either in place of or in addition to the new).

---

• [bugs:#475] https://sourceforge.net/p/psrchive/bugs/475/ Newest
  Version Is Unable To Import Archive_load Function *

Status: open
Group: next release
Created: Sat Feb 11, 2023 05:12 PM UTC by Jacob Turner
Last Updated: Mon Feb 13, 2023 04:07 PM UTC
Owner: Paul Demorest

I seem to not be able to load certain functions after the2023-01-24
version update. On my machine, when I run from psrchive import
Archive_load I get ImportError: cannot import name 'Archive_load' from
'psrchive'
(/opt/python/3.9/envs/pulsar/lib/python3.10/site-packages/psrchive.py)
which was not happening in previous updates.

---

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https://sourceforge.net/p/psrchive/bugs/475/

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[Paul Demorest]

One more bit of info for the record, this change appeared in swig 4.1.0. From https://www.swig.org/Release/CHANGES:

2022-03-21: jschueller, jim-easterbrook, wsfulton
            [Python] #2137 C++ static member functions no longer generate a "flattened"
            name in the Python module. For example:

              s = example.Spam()
              s.foo()               # Spam::foo() via an instance
              example.Spam.foo()    # Spam::foo() using class method
              example.Spam_foo()    # Spam::foo() "flattened" name

            The "flattened" name is no longer generated, but can be generated
            by using the new -flatstaticmethod option.

            *** POTENTIAL INCOMPATIBILITY ***

I'll get a new build going soon that enables this option for backwards compatibility.

[Paul Demorest]

OK there is a new conda-forge package (still v2023.01.24, build number 4) that enables the relevant option and restores Archive_load(). Useful to note that Archive.load() also works, so that may be a more "future-proof" choice, and any modifications made in the past day don't necessarily need to be reverted.

I'll leave this ticket open for now since this should eventually be addressed in psrchive configure as well, to automatically enable -flatstaticmethod when swig version >= 4.1.0.