clean digraph.py

[dcoudert]

Mostly PEP8 cleaning and fixing the documentation.

Possible issue: sort lists of vertices in layout_acyclic_dummy.

CC: @tscrim @fchapoton

Component: graph theory

Author: David Coudert

Branch/Commit: e4be7c5

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/26578

[dcoudert]

New commits:

43334c7	clean digraph.py
7e257f2	fix various issues in the documentation

[dcoudert]

Branch: public/26578_digraph_py

[dcoudert]

Commit: 7e257f2

[tscrim]

comment:2

This `i` divides `j`.:: will become $i$ divides $j$.:, so either remove the period or add a space before the ::.

if weighted is None: self._weighted = False should be on 2 lines.

Bad space: self.allow_loops(loops ,check=False).

Otherwise LGTM.

[sagetrac-git]

Changed commit from 7e257f2 to 9814a1b

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

9814a1b

trac #26578: reviewer's comments

[dcoudert]

comment:4

I have implemented your comments. On the way, I found some places where to use .edges(sort=False).

[tscrim]

comment:5

Thank you, although you've picked up some trivial failures:

sage -t --long src/sage/graphs/digraph_generators.py  # 4 doctests failed

Once fixed, you can set a positive review.

[tscrim]

Reviewer: Travis Scrimshaw

[sagetrac-git]

Changed commit from 9814a1b to e4be7c5

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

e4be7c5

trac #26578: fix doctests in digraph_generators.py

[dcoudert]

comment:7

Thank you.

[vbraun]

Changed branch from public/26578_digraph_py to e4be7c5