MAINT: Add support for planar layout from NX

[MridulS]

Added support for nx.draw_planar convenience function and an example to the User guide.

Wasn't sure how to test this, let me know if I anything else is required :)

[maximlt]

Hey thanks @MridulS for the PR!

I don't think it's documented anywhere (while it should!) but there's a little script we run on a notebook before committing any change to strip its metadata. You need to have jq installed on your system:

#!/bin/bash

jq --sort-keys --indent 1 \
    '
    (.cells[] | select(has("outputs")) | .outputs) = []
    | (.cells[] | select(has("execution_count")) | .execution_count) = null
    | .metadata = {"language_info": {"name":"python", "pygments_lexer": "ipython3"}}
    | .cells[].metadata = {}
    | del(.cells[].id)
    ' "$1" > /tmp/$(basename $1) && cat /tmp/$(basename $1) > "$1"

Otherwise your PR looks good to me.

[jbednar]

Looks good, once the metadata is cleared and the tests pass. Thanks!

[MridulS]

The 2.7 failure was unrelated from this change, should be fixed by e82b953 .

[MridulS]

#651 has a couple of py3 specific syntax (numeric underscores and f strings).
Is it time to drop py2.7 support?

[philippjfr]

I'd be happy to drop py2.7 as part of the 0.8 release tbh.

[MridulS]

This should be ready to merge then :)

[philippjfr]

Thanks @MridulS!