Fixes some python style issues.

[Dunedan]

No changes in binders functionality are included in this commit, just improved python style.

Improves Landscapes rating from 76% to 90%.

[landscape-bot]

Repository health increased by 14% when pulling 20d7858 on Dunedan:style-fixes into ec85c46 on jforman:master.

• 3 new problems were found (including 0 errors and 0 code smells).
• 87 problems were fixed (including 0 errors and 10 code smells).