[MRG]fix minor errors in developer's utils

[massich]

Reference Issue

What does this implement/fix? Explain your changes.

Any other comments?

[codecov]

Codecov Report

Merging #326 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #326   +/-   ##
=====================================
  Coverage      98%    98%           
=====================================
  Files          66     66           
  Lines        3860   3860           
=====================================
  Hits         3783   3783           
  Misses         77     77

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