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Create Day-7_Reverse_a_SLL.py

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	`1`	`+class Solution:`
	`2`	`+ def reverseList(self, head: Optional[ListNode]) -> Optional[ListNode]:`
	`3`	`+ prev = None`
	`4`	`+ while head:`
	`5`	`+ x = head.next`
	`6`	`+ head.next = prev`
	`7`	`+ prev = head`
	`8`	`+ head = x`
	`9`	`+`
	`10`	`+ return prev`

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