Fix error message and format with python/black ()

@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

@ -1,27 +1,42 @@
#!/usr/bin/env python3
def climb_stairs(n: int) -> int: def climb_stairs(n: int) -> int:
""" """
LeetCdoe No.70: Climbing Stairs LeetCdoe No.70: Climbing Stairs
Distinct ways to climb a n step staircase where Distinct ways to climb a n step staircase where
each time you can either climb 1 or 2 steps. each time you can either climb 1 or 2 steps.
Args: Args:
n: number of steps of staircase n: number of steps of staircase
Returns: Returns:
Distinct ways to climb a n step staircase Distinct ways to climb a n step staircase
Raises: Raises:
AssertionError: n not positive integer AssertionError: n not positive integer
>>> climb_stairs(3) >>> climb_stairs(3)
3 3
>>> climb_stairs(1) >>> climb_stairs(1)
1 1
""" >>> climb_stairs(-7) # doctest: +ELLIPSIS
assert isinstance(n,int) and n > 0, "n needs to be positive integer, your input {0}".format(0) Traceback (most recent call last):
if n == 1: return 1 ...
dp = [0]*(n+1) AssertionError: n needs to be positive integer, your input -7
dp[0], dp[1] = (1, 1) """
for i in range(2,n+1): fmt = "n needs to be positive integer, your input {}"
dp[i] = dp[i-1] + dp[i-2] assert isinstance(n, int) and n > 0, fmt.format(n)
return dp[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()