remove use of inspect.stack(), fix #532

[bckohan]

As mentioned in #532 inspect.stack() builds frame information for the entire stack which is unnecessarily slow.

[sobolevn]

Thanks, this code is very old :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (654b1a6) to head (5fbb386).
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #533   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           41        42    +1     
  Branches         7         7           
=========================================
+ Hits            41        42    +1     

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