Flake8 cleanup#625

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Cdiaz1234 wants to merge 5 commits intomatplotlib:developfrom

Cdiaz1234:flake8-cleanup

Commits on Apr 9, 2025

Fix incorrect docstring return order in shiftdata()
Cdiaz1234
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Commits on Apr 10, 2025

Fix shiftdata docstring (Issue #599) and add rounding of lonsin to 6 decimal places for cleaner output
Cdiaz1234
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Add test to validate longitude rounding and data integrity in shiftdata()
Cdiaz1234
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Commits on May 4, 2025

Clean up solar.py to pass flake8 (Issue #528)
Cdiaz1234
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Commits on May 7, 2025

Fix #493: Skip zero-width dashes to restore visible grid lines
Cdiaz1234
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