Get a Fibonacci number with O(n).
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# coding: utf-8 | |
"""Gets Fibonacci numbers with a linear Order. | |
""" | |
def get_fibonacci(n): | |
a = 0 | |
b = 1 | |
for i in range(0, n): | |
a, b = b, a + b | |
return a | |
if __name__ == '__main__': | |
import unittest | |
class FibonacciTestCase(unittest.TestCase): | |
def test_get_fibonacci(self): | |
pairs = [ | |
[0, 0], | |
[1, 1], | |
[2, 1], | |
[3, 2], | |
[4, 3], | |
[5, 5], | |
[6, 8], | |
[7, 13], | |
[8, 21], | |
] | |
for n, expected in pairs: | |
self.assertEqual(get_fibonacci(n), expected) | |
unittest.main() |
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