Python 3.13.1 broke [s for s in sl] where sl is a SectionList.

[nrnhines]

This PR fixes (works around?) the following Python-3.13.1 error:

$ python
Python 3.13.1 (main, Dec  6 2024, 07:50:24) [GCC 13.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from neuron import h
>>> sl = h.SectionList()
>>> [s for s in sl]
Traceback (most recent call last):
  File "<python-input-2>", line 1, in <module>
    [s for s in sl]
                ^^
TypeError: Not an iterable HocObject
>>> 

It also provides the len function, ie. given the above empty sl

>>> len(sl)
0

[azure-pipelines]

✔️ bf3cc7e -> Azure artifacts URL

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.05%. Comparing base (47b0359) to head (836a96d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3276      +/-   ##
==========================================
- Coverage   67.06%   67.05%   -0.01%     
==========================================
  Files         571      571              
  Lines      111072   111080       +8     
==========================================
- Hits        74493    74489       -4     
- Misses      36579    36591      +12     

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[JCGoran]

LGTM, nice work!

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[bbpbuildbot]

Logfiles from GitLab pipeline #240138 (:no_entry:) have been uploaded here!

Status and direct links:

• ✅ mac_m1_cmake_build: [cmake, ON, OFF, OFF, address]
• ✅ spack_setup
• ✅ build:nmodl
• ✅ build:neuron:nmodl:intel:legacy
• ✅ build:neuron:nmodl:intel:shared
• ✅ build:neuron:nmodl:nvhpc:acc:legacy
• ✅ build:neuron:nmodl:nvhpc:acc:shared
• ✅ build:neuron:nmodl:nvhpc:omp:legacy
• ✅ build:neuron:nmodl:nvhpc:omp
• ✅ test:neuron:nmodl:intel:legacy
• ✅ test:neuron:nmodl:intel:shared
• ⛔ test:neuron:nmodl:nvhpc:acc:legacy
• ⛔ test:neuron:nmodl:nvhpc:acc:shared
• ⛔ test:neuron:nmodl:nvhpc:omp:legacy
• ⛔ test:neuron:nmodl:nvhpc:omp

[azure-pipelines]

✔️ 836a96d -> Azure artifacts URL