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Fixed error in binary_search_by_recursion

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In binary_search_by_recursion, if you search array for a value that does not exist, you will get this error:
RecursionError: maximum recursion depth exceeded in comparison

To fix this, first check to make sure that the value is between left and right points like this:
    if (right < left):
        return None

A similar construct has already been applied to binary_search, but did not exist in the recursive alternative.
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Ant Fitch 2018-01-30 18:50:07 -08:00 committed by GitHub
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commit 53681f199c
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searches/binary_search.py
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@ -110,6 +110,9 @@ def binary_search_by_recursion(sorted_collection, item, left, right):
>>> binary_search_std_lib([0, 5, 7, 10, 15], 6)
"""
if (right < left):
return None
midpoint = left + (right - left) // 2
if sorted_collection[midpoint] == item: