Completely Empty

Completely Empty


You need to figure if a wellfounded and wellsized iterable is completely empty.

An iterable x0 is wellfounded if there is no infinite sequence

such that
... in x3 in x2 in x1 in x0
is meant iteratively,
will be encountered while iterating through

A wellfounded iterable is wellsized if it has only finitely many iterable elements, and all of them are wellsized.

A wellfounded iterable is completely empty when all its elements are completely empty.

Some consequences of the above definitions:

  • any empty iterable is completely empty
  • a non-iterable is never completely empty
  • the only wellfounded string is
    , and it is completely empty
  • bytes, and (possibly nested) tuples/frozensets of them are always wellfounded and wellsized
  • {'': 'Nonempty'}
    is a wellfounded and completely empty iterable
  • after
    , c is a non-wellfounded iterable
  • itertools.repeat(())
    is wellfounded but not wellsized
  • itertools.repeat(5)
    is wellfounded and wellsized

Input: A wellfounded and wellsized iterable.

Output: A bool.


completely_empty([]) == True
completely_empty([1]) == False
completely_empty([[]]) == True
completely_empty([[],[]]) == True
completely_empty([[[]]]) == True
completely_empty(['']) == True
completely_empty([[],[{'':'No WAY'}]]) == True
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CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.

In order to install CheckiO client you'll need installed Python (version at least 3.8)

Install CheckiO Client first:

pip3 install checkio_client

Configure your tool

checkio --domain=py config --key=

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checkio sync

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checkio serv -d

Alternatevly, you can install Chrome extension or FF addon

checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium

Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.

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