add lower() and upper for py str feat:(#232)

[wdq112]

add lower() and upper for py str

Updates #232

[wdq112]

feat #232

[sbinet]

LGTM.

thanks for the PR.

could you send another PR against go-python/license adding yourself to the AUTHORS and/or CONTRIBUTORS file(s) ?
then I'll merge this one in.

thanks again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.47%. Comparing base (23c0aa2) to head (e40546f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #233      +/-   ##
==========================================
+ Coverage   75.45%   75.47%   +0.01%     
==========================================
  Files          79       79              
  Lines       13214    13222       +8     
==========================================
+ Hits         9971     9979       +8     
  Misses       2568     2568              
  Partials      675      675              

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[sbinet]

perhaps also add a test for upper and lower in py/tests/string.py, after:
https://github.com/go-python/gpython/blob/23c0aa2/py/tests/string.py#L889...L898

(to appease the testing gods)

[sbinet]

needs go-python/license#22

[sbinet]

Thanks a lot for this PR.

do you want to give the last leg of #232 (str.join) a try ? :}

[wdq112]

I'll try it when I have time.