[$] Lazy imports for Python

Starting a Python application typically results in a flurry of imports as
modules from various locations (and the modules they import) get added
into the application process. All of that occurs before the application
even gets started doing whatever it is the user actually launched it for;
that delay can be significant—and annoying. Beyond that, many of those
imports may not be necessary at all for the code path being followed, so
eagerly doing the import is purely wasted time. A proposal back in May
would add a way for applications to choose lazy imports, where the import
is deferred until the module is actually used.