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优化 0027.移除元素.md Python3解法

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Original file line number	Diff line number	Diff line change
`@@ -144,15 +144,28 @@ class Solution {`
`144`	`144`
`145`	`145`	`Python:`
`146`	`146`
`147`		-```python
	`147`	+```python3
`148`	`148`	`class Solution:`
`149`		`- def removeElement(self, nums: List[int], val: int) -> int:`
`150`		`- i,n = 0,len(nums)`
`151`		`- for j in range(n):`
`152`		`- if nums[j] != val:`
`153`		`- nums[i] = nums[j]`
`154`		`- i += 1`
`155`		`- return i`
	`149`	`+ """双指针法`
	`150`	`+ 时间复杂度:O(n)`
	`151`	`+ 空间复杂度:O(1)`
	`152`	`+ """`
	`153`	`+`
	`154`	`+ @classmethod`
	`155`	`+ def removeElement(cls, nums: List[int], val: int) -> int:`
	`156`	`+ fast = slow = 0`
	`157`	`+`
	`158`	`+ while fast < len(nums):`
	`159`	`+`
	`160`	`+ if nums[fast] != val:`
	`161`	`+ nums[slow] = nums[fast]`
	`162`	`+ slow += 1`
	`163`	`+`
	`164`	`+ # 当 fast 指针遇到要删除的元素时停止赋值`
	`165`	`+ # slow 指针停止移动, fast 指针继续前进`
	`166`	`+ fast += 1`
	`167`	`+`
	`168`	`+ return slow`
`156`	`169`	```
`157`	`170`
`158`	`171`

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