add isort to sort imports

[njzjz]

This is an automatic tool to format and sort imports. See https://github.com/PyCQA/isort for details.

[codecov-commenter]

Codecov Report

Base: 82.41% // Head: 82.38% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (f42e1a4) compared to base (d7829e5).
Patch coverage: 78.57% of modified lines in pull request are covered.

❗ Current head f42e1a4 differs from pull request most recent head 21dbbf8. Consider uploading reports for the commit 21dbbf8 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #418      +/-   ##
==========================================
- Coverage   82.41%   82.38%   -0.04%     
==========================================
  Files          67       67              
  Lines        5955     5960       +5     
==========================================
+ Hits         4908     4910       +2     
- Misses       1047     1050       +3     

Impacted Files	Coverage Δ
dpdata/driver.py	84.37% <66.66%> (-1.84%)	⬇️
dpdata/abacus/scf.py	91.98% <87.50%> (-0.46%)	⬇️

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