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Added doctests for fibonacci.py (#10836)

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* added other possible cases

* added test for correct output of truth table

* few fibonacci tests added

* updating DIRECTORY.md

* Update nor_gate.py

* updating DIRECTORY.md

* Update fibonacci.py

removed whitespace

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maths/fibonacci.py
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@ -81,6 +81,18 @@ def fib_recursive(n: int) -> list[int]:
def fib_recursive_term(i: int) -> int:
"""
Calculates the i-th (0-indexed) Fibonacci number using recursion
>>> fib_recursive_term(0)
0
>>> fib_recursive_term(1)
1
>>> fib_recursive_term(5)
5
>>> fib_recursive_term(10)
55
>>> fib_recursive_term(-1)
Traceback (most recent call last):
...
Exception: n is negative
"""
if i < 0:
raise Exception("n is negative")
@ -197,6 +209,10 @@ def fib_binet(n: int) -> list[int]:
if __name__ == "__main__":
import doctest
doctest.testmod()
num = 30
time_func(fib_iterative, num)
time_func(fib_recursive, num) # Around 3s runtime