Add structure attribute

[codecov-commenter]

Codecov Report

Merging #158 (ff0a367) into main (f503b93) will decrease coverage by 0.03%. The diff coverage is 84.48%.

@@            Coverage Diff             @@
##             main     #158      +/-   ##
==========================================
- Coverage   81.58%   81.55%   -0.04%     
==========================================
  Files          48       48              
  Lines        8825     8874      +49     
==========================================
+ Hits         7200     7237      +37     
- Misses       1625     1637      +12     

Flag	Coverage Δ
unittests	81.55% <84.48%> (-0.04%)	:arrow_down:

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Impacted Files	Coverage Δ
setup.py	0.00% <ø> (ø)
sidpy/sid/dataset.py	72.15% <58.33%> (-0.50%)	:arrow_down:
sidpy/io/interface_utils.py	49.11% <89.18%> (+14.01%)	:arrow_up:
sidpy/__version__.py	100.00% <100.00%> (ø)
tests/io/test_interface_utils.py	100.00% <100.00%> (ø)
tests/sid/test_dataset.py	99.78% <100.00%> (+<0.01%)	:arrow_up:
tests/viz/test_plot_utils.py	99.49% <100.00%> (-0.02%)	:arrow_down:
sidpy/viz/plot_utils/curve.py	19.35% <0.00%> (-5.02%)	:arrow_down:

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