SG-38306 Python2 Removal - Part 3 - Cleanup imports

[julien-lang]

• Replace six.moves imports
• Cleanup BytesIO import from six
• Remove deprecated Simple json import management
• Cleanup Py2-3 compat with ImportError
• Simplify Base64

PR orders

• SG-38306 Python2 Removal - Part 1 - Import order #398
• SG-38306 Python2 Removal - Part 2 - Easy ones #399
• SG-38306 Python2 Removal - Part 3 - Cleanup imports #400
• SG-38306 Python2 Removal - Part 4 - Mimetypes module #401
• SG-38306 Python2 Removal - Part 5 - Remove deprecated backported mock module #402
• SG-38306 Python2 Removal - Part 6 - Remove python2 from httplib2 module #403
• SG-38306 Python2 Removal - Part 7 - various #404
• SG-38306 Python2 Removal - Part 8 - Remove deprecated ensure_ascii parameter from SG object #405
• SG-38306 Python2 Removal - Part 9 - six module #395

WIP

• SG-38306 Remove Python 2 - Part 10 - SSL #372
• SG-38306 Remove Python 2 - Leftovers #406

[Copilot]

Pull Request Overview

This PR is part of a Python 2 removal effort that focuses on cleaning up imports throughout the codebase. The changes replace deprecated six.moves imports with their standard Python 3 equivalents, simplify base64 encoding logic, and remove legacy Python 2/3 compatibility code.

Key changes include:

• Replacing six.moves imports with direct Python 3 standard library imports
• Simplifying base64 encoding by using base64.encodebytes directly
• Removing deprecated JSON import fallback logic and Python 2/3 compatibility code

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_unit.py	Replaces six.moves.urllib with direct urllib.request and urllib.error imports
tests/test_client.py	Removes JSON import fallback logic and base64 compatibility code, adds direct stdlib imports
tests/test_api.py	Replaces six.moves imports with direct urllib imports
tests/base.py	Adds direct configparser and json imports, removes Python 2.6 compatibility code
shotgun_api3/shotgun.py	Major cleanup replacing six.moves imports with direct stdlib imports and simplifying base64 usage
shotgun_api3/lib/mockgun/schema.py	Replaces six.moves.cPickle with direct pickle import
docs/cookbook/examples/ami_handler.rst	Updates documentation example to use direct urllib.parse import

[carlos-villavicencio-adsk]

LGTM