Code improvments for example notebooks

[alexott]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (master@1f96d6a). Click here to learn what that means.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #34   +/-   ##
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  Coverage          ?   86.40%           
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  Files             ?        8           
  Lines             ?      618           
  Branches          ?        0           
=========================================
  Hits              ?      534           
  Misses            ?       84           
  Partials          ?        0           

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[alexott]

@arunpamulapati is it possible to review & merge? Especially the 2nd commit

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