Exposing functions to users

Now that your impyrial package has some useful code and is properly organized, it is time to use import structures to expose the functions to users.

Currently, the only function you want to make easily available to users is the convert_unit() function inside the module impyrial/length/api.py.

In this exercise, you'll write import statements so that the package can be imported and used like this:

import impyrial

result = impyrial.length.convert_unit(6, 'ft', 'yd')

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