some flake8 cleanup in manifolds

[fchapoton]

mainly about E701 and E702 : one command per line

CC: @egourgoulhon

Component: manifolds

Author: Frédéric Chapoton

Branch/Commit: dc768e4

Reviewer: Eric Gourgoulhon

Issue created by migration from https://trac.sagemath.org/ticket/30538

[fchapoton]

Commit: dc768e4

[fchapoton]

New commits:

dc768e4

flake8 details in manifolds/ (E701 and E702)

[fchapoton]

Branch: u/chapoton/30538

[egourgoulhon]

comment:2

Thanks for taking care of this. Is the ticket ready for review?

[fchapoton]

comment:3

yes, I was just waiting for a patchbot, but this takes along time

[egourgoulhon]

comment:4

LGTM. The patchbot failures are not related to this ticket.

[egourgoulhon]

Reviewer: Eric Gourgoulhon

[vbraun]

Changed branch from u/chapoton/30538 to dc768e4