fixed the tree print issue

[GuiLingfeng]

PR Summary:

fixed the issue not being able to print the hireachy.
related to the issue (#1143)

PR Checklist

---

• Includes appropriate unit test(s)
• Appropriate docstring(s) are added/updated
• Code is (approximately) PEP8 compliant
• Issue(s) raised/addressed?

[daico007]

LGTM!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9499a8c) 87.18% compared to head (3f1182b) 87.18%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1155   +/-   ##
=======================================
  Coverage   87.18%   87.18%           
=======================================
  Files          62       62           
  Lines        6492     6492           
=======================================
  Hits         5660     5660           
  Misses        832      832           

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