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Merge pull request #445 from borninfreedom/master

update左旋转字符串,添加python代码

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`@@ -118,6 +118,27 @@ class Solution {`
`118`	`118`	`}`
`119`	`119`	```
`120`	`120`
	`121`	+```python
	`122`	`+# 方法一:可以使用切片方法`
	`123`	`+class Solution:`
	`124`	`+ def reverseLeftWords(self, s: str, n: int) -> str:`
	`125`	`+ return s[n:] + s[0:n]`
	`126`	`+`
	`127`	`+# 方法二:也可以使用上文描述的方法,有些面试中不允许使用切片,那就使用上文作者提到的方法`
	`128`	`+# class Solution:`
	`129`	`+# def reverseLeftWords(self, s: str, n: int) -> str:`
	`130`	`+# s = list(s)`
	`131`	`+# s[0:n] = list(reversed(s[0:n]))`
	`132`	`+# s[n:] = list(reversed(s[n:]))`
	`133`	`+# s.reverse()`
	`134`	`+`
	`135`	`+# return "".join(s)`
	`136`	`+`
	`137`	`+`
	`138`	`+# 时间复杂度:O(n)`
	`139`	`+# 空间复杂度:O(n),python的string为不可变,需要开辟同样大小的list空间来修改`
	`140`	+```
	`141`	`+`
`121`	`142`	`Go:`
`122`	`143`
`123`	`144`	```go

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