15-line simple python solution


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    class Solution(object):
        def reverseKGroup(self, head, k):
            res = ListNode(None)
            res.next = head
            a = list()        
            while head:
                a.append(head)
                head = head.next
                if len(a) == k:
                    res.next = a[k-1]
                    for i in range(k-1, 0, -1):
                        a[i].next = a[i-1]
                    a[0].next = self.reverseKGroup(head, k)
                    return res.next        
            return res.next
    

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