Update 0541.反转字符串II.md

[EMU1337X]

Python：

class Solution(object):
def reverseStr(self, s, k):
"""
:type s: str
:type k: int
:rtype: str
"""
s = ' '.join(s)
s = s.split(' ')
def reverse(ss):
l = len(ss) - 1
for i in range(int(len(ss) / 2)):
ss[i], ss[l - i] = ss[l - i], ss[i]
return ss

    for i in range(0, len(s), 2 * k):
        if i + k > len(s) - 1:
            s[i:] = reverse(s[i:])
        else:
            s[i:i + k] = reverse(s[i:i + k])
    s = ''.join(s)
    return s