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added one last change to check to make sure arg n is a positive int

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booboy 2018-01-12 01:40:46 -06:00
parent 398c60feb5
commit 9ee07824cf
1 changed files with 8 additions and 0 deletions
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8
algorithms/fibonacci/fibonacci_with_lru_cache.py
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@ -1,8 +1,16 @@
#!/usr/bin/env python3 #!/usr/bin/env python3
from functools import lru_cache from functools import lru_cache
@lru_cache(maxsize = 1000) @lru_cache(maxsize = 1000)
def fibonacci(n): def fibonacci(n):
# check input type. must be positive integer.
if type(n) != int:
raise TypeError("n must be a positive int")
if n < 1:
raise ValueError("n must be a positive int")
# compute the nth term
if n == 1: if n == 1:
return 1 return 1
elif n == 2: elif n == 2: