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添加0028.实现strStr python版本暴力解法

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Original file line number	Diff line number	Diff line change
`@@ -685,7 +685,21 @@ class Solution {`
`685`	`685`	```
`686`	`686`
`687`	`687`	`Python3:`
`688`		`-`
	`688`	+```python
	`689`	`+//暴力解法:`
	`690`	`+class Solution(object):`
	`691`	`+ def strStr(self, haystack, needle):`
	`692`	`+ """`
	`693`	`+ :type haystack: str`
	`694`	`+ :type needle: str`
	`695`	`+ :rtype: int`
	`696`	`+ """`
	`697`	`+ m,n=len(haystack),len(needle)`
	`698`	`+ for i in range(m):`
	`699`	`+ if haystack[i:i+n]==needle:`
	`700`	`+ return i`
	`701`	`+ return -1`
	`702`	+```
`689`	`703`	```python
`690`	`704`	`// 方法一`
`691`	`705`	`class Solution:`

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