Fix flake8 issues since release 3.6.0 Flake8 had a new release which raise new issues, namely: W504: line break after binary operator F841: local variable 'ex' is assigned to but never used W605: invalid escape sequence F821: undefined name 'buffer' (noqa seems the only way to avoid this false positive) Also pin flake8>=3.6 in our tests and make explicit that we use python3 to run flake8 tests.

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Release notes

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.. toctree::

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    3.25

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    3.24

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    3.23

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    3.22

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    3.21

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    3.20

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    3.19

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    3.18

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    3.17

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    3.16

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    3.15

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    3.14