feat: Add support for POWHEG weights

[APN-Pucky]

powheg uses plain text weights in lhe, like:

<event>
      7  10001  1.11453E+07  2.42132E+00 -1.00000E+00  3.21830E-01
      -2    -1     0     0     0   502  0.000000000E+00  0.000000000E+00  1.596673772E-01  1.596673772E-01  0.000000000E+00  0.00000E+00  9.000E+00
      21    -1     0     0   502   501  0.000000000E+00  0.000000000E+00 -1.979087573E+01  1.979087573E+01  0.000000000E+00  0.00000E+00  9.000E+00
      23     2     1     2     0     0 -2.715131942E-01 -6.004246500E-01 -3.272239123E+00  3.504354871E+00  1.067110589E+00  0.00000E+00  9.000E+00
      11     1     3     3     0     0 -9.921110112E-02  2.574546034E-01 -3.072708859E-01  4.129665530E-01  5.110000000E-04  0.00000E+00  9.000E+00
     -11     1     3     3     0     0 -1.723020930E-01 -8.578792534E-01 -2.964968237E+00  3.091388318E+00  5.110000000E-04  0.00000E+00  9.000E+00
      -2     1     1     2     0   511 -3.204270527E-01  4.049849988E-01 -1.767181124E+00  1.841090837E+00  0.000000000E+00  0.00000E+00  9.000E+00
      21     1     1     2   511   501  5.919402469E-01  1.954396512E-01 -1.459178811E+01  1.460509740E+01  1.685873940E-07  0.00000E+00  9.000E+00
#rwgt            2         101   3933017.7360749426                3         267           0
<weights>
0.11148E+08
0.11098E+08
0.10961E+08
0.13534E+08
0.87849E+07
0.91411E+07
0.13910E+08
0.11218E+08
0.11076E+08
0.10925E+08
0.10971E+08
0.10997E+08
0.11103E+08
0.10964E+08
0.10974E+08
0.11205E+08
0.11144E+08
0.11317E+08
0.11325E+08
0.11321E+08
0.11305E+08
0.11320E+08
0.11363E+08
0.11194E+08
0.11332E+08
0.11284E+08
0.11069E+08
0.11289E+08
0.11223E+08
0.11280E+08
0.11332E+08
0.11131E+08
0.11219E+08
0.11152E+08
0.11150E+08
0.11264E+08
0.11044E+08
0.10938E+08
0.11302E+08
0.11118E+08
0.11175E+08
0.11155E+08
0.11140E+08
0.11353E+08
0.10951E+08
</weights>
</event>

pwgevents-0001.lhe.zip

* Add support for reading POWHEG weights.
* Add tests for POWHEG.
   - Update scikit-hep-testdata test dependency to include
     version with POWHEG file.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (c5503c2) 88.18% compared to head (c25df6e) 91.48%.

Files	Patch %	Lines
src/pylhe/__init__.py	93.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #220      +/-   ##
==========================================
+ Coverage   88.18%   91.48%   +3.30%     
==========================================
  Files           2        2              
  Lines         220      235      +15     
  Branches       48       54       +6     
==========================================
+ Hits          194      215      +21     
+ Misses         23       16       -7     
- Partials        3        4       +1     

Flag	Coverage Δ
unittests-3.10	91.06% <93.33%> (+3.33%)	⬆️
unittests-3.8	91.06% <93.33%> (+3.33%)	⬆️

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[eduardo-rodrigues]

Hello @APN-Pucky, Thank you for this addition 👍. I think it would be very important to add your test file to scikit-hep-testdata and have it used in the test suite here, to enhance what is covered. Can you kindly take care of that?

Agree and any comments, @matthewfeickert?

[APN-Pucky]

So just PR a simple LHE file to https://github.com/scikit-hep/scikit-hep-testdata and wait for a release then included that here?

[eduardo-rodrigues]

Precisely :)

I will not be much available until Wednesday but you can ping Jim or Matthew for example. Advance thanks.

[eduardo-rodrigues]

FYI I've now made a release with your files - https://github.com/scikit-hep/scikit-hep-testdata/releases/tag/v0.4.36. I hope it will show up in PyPI soon.

I'm not sure if @matthewfeickert is still around for a review. I will not be working much more until the new year :-).

Enjoy the Christmas break and "talk to you" in 2024!

[APN-Pucky]

Thank you for the effort of getting this through in this year. It is by no means in a hurry, so lets wait for next year.

Merry Christmas and happy new year to everyone reading this.

[APN-Pucky]

Thanks for adding me to the particle contributors. What's the status of this MR?

[eduardo-rodrigues]

Hi. Seems @matthewfeickert and/or @lukasheinrich as experts have been overlooking this. Let's see now with a reping ...

As for your question above, it sounds good to me.

Is there anything else you intend to change in this PR or else it is totally ready from your side?

[APN-Pucky]

Is there anything else you intend to change in this PR or else it is totally ready from your side?

This PR is done from my side since I already changed the access to the weighs to be by the id name.

[eduardo-rodrigues]

Thank you for the nice additions. I'm approving and will be merging tomorrow unless we hear from @matthewfeickert on other feedback.

[matthewfeickert]

Thanks for the PR @APN-Pucky! This is great, and we should cut a new relase after this. I just have a few questions and requested changes, but this is looking good overall!

[matthewfeickert]

LGTM. Thank you @APN-Pucky!

[matthewfeickert]

@all-contributors please add @APN-Pucky for code.

[allcontributors]

@matthewfeickert

I've put up a pull request to add @APN-Pucky! 🎉

[matthewfeickert]

@APN-Pucky Release v0.8.0 is now out on PyPI with this contribution in it. Thanks!