Producing import graphs listing all imported names
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findimports can produce a detailed list of all imported names

    >>> from findimports import main
    >>> exitcode = main(['findimports', '--names', sample_tree])
    apple:
      os
      sys
      sys
    box.__init__:
    <BLANKLINE>
    box.cat:
      gc
      yarn
    box.yarn:
    <BLANKLINE>
    orange:
      gc
