Version 1.7.2

Merge pull request #2230 from 3b1b/video-work

Misc. bug fixes

Merge pull request #2180 from fofoni/fix-ipython-scope

Fix `NameError` when a pasted function attempts to access a variable in its outer scope

release: ready to release v1.6.1

release: ready to release v1.6.0

release: ready to release v1.5.0

release: ready to release v1.4.1

release: ready to release v1.4.0

release: ready to release v1.3.0

update version to v1.2.0