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11 changes: 11 additions & 0 deletions maths/primelib.py
Original file line number Diff line number Diff line change
Expand Up @@ -574,6 +574,11 @@ def fib(n):
"""
input: positive integer 'n'
returns the n-th fibonacci term , indexing by 0

>>> fib(5)
8
>>> fib(99)
354224848179261915075
"""

# precondition
Expand All @@ -589,3 +594,9 @@ def fib(n):
fib1 = tmp

return ans


if __name__ == "__main__":
import doctest

doctest.testmod()