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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import unittest
def arithmetic_slices(lst):
if len(lst) < 3:
return []
slices = []
for i in range(len(lst) - 2):
if lst[i + 1] - lst[i] == lst[i + 2] - lst[i + 1]:
diff = lst[i + 1] - lst[i]
slice = [lst[i], lst[i + 1], lst[i + 2]]
slices.append(slice[:])
for j in range(i + 3, len(lst)):
if lst[j] - lst[j - 1] == diff:
slice.append(lst[j])
slices.append(slice[:])
else:
break
return slices
class TestArithmeticSlices(unittest.TestCase):
def test_cases(self):
self.assertEqual(arithmetic_slices([1, 2, 3, 4]),
[[1, 2, 3], [1, 2, 3, 4], [2, 3, 4]], 'Test Case 1')
self.assertEqual(arithmetic_slices([2]), [], 'Test Case 2')
if __name__ == '__main__':
unittest.main()
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