Only keep code object for function name and use qualname

[gaogaotiantian]

close #469

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (5495e89) to head (730fec9).

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Additional details and impacted files

@@            Coverage Diff            @@
##            master      #470   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines         2308      2308           
=========================================
  Hits          2308      2308           

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