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63 lines
1.6 KiB
Python
63 lines
1.6 KiB
Python
"""
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This is pure python implementation of linear search algorithm
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For doctests run following command:
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python -m doctest -v linear_search.py
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or
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python3 -m doctest -v linear_search.py
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For manual testing run:
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python linear_search.py
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"""
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from __future__ import print_function
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def linear_search(sequence, target):
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"""Pure implementation of linear search algorithm in Python
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:param sequence: some sorted collection with comparable items
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:param target: item value to search
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:return: index of found item or None if item is not found
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Examples:
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>>> linear_search([0, 5, 7, 10, 15], 0)
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0
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>>> linear_search([0, 5, 7, 10, 15], 15)
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4
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>>> linear_search([0, 5, 7, 10, 15], 5)
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1
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>>> linear_search([0, 5, 7, 10, 15], 6)
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"""
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for index, item in enumerate(sequence):
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if item == target:
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return index
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return None
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if __name__ == '__main__':
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import sys
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# For python 2.x and 3.x compatibility: 3.x has no raw_input builtin
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# otherwise 2.x's input builtin function is too "smart"
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if sys.version_info.major < 3:
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input_function = raw_input
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else:
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input_function = input
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user_input = input_function('Enter numbers separated by coma:\n')
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sequence = [int(item) for item in user_input.split(',')]
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target_input = input_function(
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'Enter a single number to be found in the list:\n'
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)
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target = int(target_input)
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result = linear_search(sequence, target)
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if result is not None:
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print('{} found at positions: {}'.format(target, result))
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else:
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print('Not found')
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