py: add String.find

[sbinet]

Updates #139.

Signed-off-by: Sebastien Binet binet@cern.ch

[codecov]

Codecov Report

Merging #188 (ab6c445) into main (6c9f9e5) will increase coverage by 0.00%.
The diff coverage is 76.92%.

@@           Coverage Diff           @@
##             main     #188   +/-   ##
=======================================
  Coverage   73.68%   73.69%           
=======================================
  Files          75       75           
  Lines       12188    12211   +23     
=======================================
+ Hits         8981     8999   +18     
- Misses       2578     2581    +3     
- Partials      629      631    +2     

Impacted Files	Coverage Δ
py/string.go	89.33% <76.92%> (-1.03%)	⬇️

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