DOC improve examples styles

[glemaitre]

Improve the example style with newer marker.

[pep8speaks]

Hello @glemaitre! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file doc/conf.py:

Line 23:1: E402 module level import not at top of file
Line 63:1: E402 module level import not at top of file

• In the file examples/api/plot_sampling_strategy_usage.py:

Line 17:1: E402 module level import not at top of file
Line 28:1: E402 module level import not at top of file
Line 29:1: E402 module level import not at top of file
Line 37:1: E402 module level import not at top of file
Line 61:1: E402 module level import not at top of file
Line 69:1: E402 module level import not at top of file
Line 85:1: E402 module level import not at top of file
Line 122:1: E402 module level import not at top of file

• In the file examples/applications/plot_impact_imbalanced_classes.py:

Line 29:1: E402 module level import not at top of file
Line 46:1: E402 module level import not at top of file
Line 64:1: E402 module level import not at top of file
Line 65:1: E402 module level import not at top of file
Line 100:1: E402 module level import not at top of file
Line 123:1: E402 module level import not at top of file
Line 124:1: E402 module level import not at top of file
Line 125:1: E402 module level import not at top of file
Line 126:1: E402 module level import not at top of file
Line 142:1: E402 module level import not at top of file
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Line 157:1: E402 module level import not at top of file
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Line 261:1: E402 module level import not at top of file
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Line 317:1: E402 module level import not at top of file
Line 340:1: E402 module level import not at top of file
Line 341:1: E402 module level import not at top of file

• In the file examples/ensemble/plot_comparison_ensemble_classifier.py:

Line 32:1: E402 module level import not at top of file
Line 33:1: E402 module level import not at top of file
Line 51:1: E402 module level import not at top of file
Line 58:1: E402 module level import not at top of file
Line 59:1: E402 module level import not at top of file
Line 68:1: E402 module level import not at top of file
Line 69:1: E402 module level import not at top of file
Line 86:1: E402 module level import not at top of file
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Line 115:1: E402 module level import not at top of file
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Line 183:1: E402 module level import not at top of file
Line 184:1: E402 module level import not at top of file

• In the file setup.py:

Line 23:11: F821 undefined name 'version'

Comment last updated at 2021-02-16 22:48:20 UTC

[codecov]

Codecov Report

Merging #813 (0debe32) into master (9f4173d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #813   +/-   ##
=======================================
  Coverage   98.59%   98.59%           
=======================================
  Files          93       93           
  Lines        6036     6036           
  Branches      503      503           
=======================================
  Hits         5951     5951           
  Misses         84       84           
  Partials        1        1           

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