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Fix error message and format with python/black (#1025)

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@SandersLin Your review please?
This commit is contained in:
cclauss 2019-07-16 07:26:28 +02:00 committed by Anup Kumar Panwar
parent 1e55bfd4da
commit 2fb3beeaf1
1 changed files with 37 additions and 22 deletions
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19
dynamic_programming/climbing_stairs.py
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@ -1,3 +1,6 @@
#!/usr/bin/env python3
def climb_stairs(n: int) -> int:
"""
LeetCdoe No.70: Climbing Stairs
@ -17,11 +20,23 @@ def climb_stairs(n: int) -> int:
3
>>> climb_stairs(1)
1
>>> climb_stairs(-7) # doctest: +ELLIPSIS
Traceback (most recent call last):
...
AssertionError: n needs to be positive integer, your input -7
"""
assert isinstance(n,int) and n > 0, "n needs to be positive integer, your input {0}".format(0)
if n == 1: return 1
fmt = "n needs to be positive integer, your input {}"
assert isinstance(n, int) and n > 0, fmt.format(n)
if n == 1:
return 1
dp = [0] * (n + 1)
dp[0], dp[1] = (1, 1)
for i in range(2, n + 1):
dp[i] = dp[i - 1] + dp[i - 2]
return dp[n]
if __name__ == "__main__":
import doctest
doctest.testmod()