Easy Python solution
\ndef reverseStr(self, s: str, k: int) -> str:\n        s=list(s)\n        for i in range(0,len(s),2*k):\n            s[i:i+k]=(s[i:i+k])[::-1]\n        return 
```\ndef reverseStr(self, s: str, k: int) -> str:\n        s=list(s)\n        for i in range(0,len(s),2*k):\n            s[i:i+k]=(s[i:i+k])[::-1]\n        return \'\'.join(s)\n```
['Python', 'Python3']