Description

• remove the PY2/3 compat module, and replace all calls to it with PY3's built-in functionality
• remove PY2 builds from Travis and AppVeyor
• remove PY2-specific dependencies from requirements and setup files
• replace PY2/3-compatible functionality for unpacking dataset archive files with a faster PY3-only equivalent
• remove PY2-only logic in io subpackage

Motivation and Context

https://pythonclock.org/

How Has This Been Tested?

All tests pass in PY3 :)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation, and I have updated it accordingly.