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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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If the number is negative, it is not a prime by definition. Using the absolute value would result in incorrect responses.
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That's right, comment edited.
Thanks.
It hasn't been removed, just moved to
functools
.There you go!
https://docs.python.org/2/library/functions.html#reduce
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primes are natural positive numbers .