[API] Get abstract paths with a different sequence key format

[aoblet]

Goal

Add the ability to use a different format for SequenceKey token with abstract_path_from_template

Use case

Find abstract paths from an houdini path template compatible for Nuke Sequence padding.

# SEQ format_spec 4 with $F format
# Let's override the output format for nuke sequence padding format
fields['SEQ'] = 'FORMAT: %d'

# Before the PR: return is empty
tank.abstract_paths_from_template(template, fields)

# After the PR: abstract paths with %04d format
tank.abstract_paths_from_template(template, fields)

Unit tests

Tests added to check this fix: tests/core_tests/tests_api:test_sequence_format

[aoblet]

@jfboismenu, @manneohrstrom what do you think about this proposal ? :)

[jfboismenu]

Hi @aoblet , we're pretty bandwidth limited, as we're putting the finishing touches on Python 3 across Shotgun. This does look super interesting however, so I've logged and linked this in JIRA. We'll keep you posted.

[jfboismenu]

Jira ticket: SG-19020

[jfboismenu]

Oh, and Manne left the team a year ago. :(

[aoblet]

@jfboismenu great, thanks for this quick feedback. Good luck

[eprana]

@aoblet @jfboismenu Hi guys, any update about this PR ?

[charltk]

Hi @eprana @aoblet sorry that it has taken so long for someone to look at this PR. I did have a question to help me understand the use case for this functionality.

I'm just wondering if you could get the same functionality by making a second template that used a key whose format spec was what you wanted instead of using and replacing the SEQ key. Or would you use this in a case where some code (eg one of the integrations perhaps) expected a SEQ key in the template but you wanted a different format spec than what is defined in the templates for SEQ? If it's the second case, would using aliases work instead (as described here https://developer.shotgridsoftware.com/82ff76f7/#example---two-fields-both-named-version-via-an-alias) ?