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Merge pull request #394 from borninfreedom/master

update有效的字母异位词,python代码添加了更pythonic的写法

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`@@ -130,7 +130,27 @@ class Solution:`
`130`	`130`	`return True`
`131`	`131`	```
`132`	`132`
	`133`	`+Python写法二(没有使用数组作为哈希表,只是介绍defaultdict这样一种解题思路):`
	`134`	`+`
	`135`	+```python
	`136`	`+class Solution:`
	`137`	`+ def isAnagram(self, s: str, t: str) -> bool:`
	`138`	`+ from collections import defaultdict`
	`139`	`+`
	`140`	`+ s_dict = defaultdict(int)`
	`141`	`+ t_dict = defaultdict(int)`
	`142`	`+`
	`143`	`+ for x in s:`
	`144`	`+ s_dict[x] += 1`
	`145`	`+`
	`146`	`+ for x in t:`
	`147`	`+ t_dict[x] += 1`
	`148`	`+`
	`149`	`+ return s_dict == t_dict`
	`150`	+```
	`151`	`+`
`133`	`152`	`Go:`
	`153`	`+`
`134`	`154`	```go
`135`	`155`	`func isAnagram(s string, t string) bool {`
`136`	`156`	`if len(s)!=len(t){`

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