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Update 0054.螺旋矩阵.md

for loop version of python3 solution

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Original file line number	Diff line number	Diff line change
`@@ -171,6 +171,30 @@ class Solution:`
`171`	`171`
`172`	`172`	`return res`
`173`	`173`	```
`174`		`-`
	`174`	+```python3
	`175`	`+class Solution:`
	`176`	`+ def spiralOrder(self, matrix: List[List[int]]) -> List[int]:`
	`177`	`+ r=len(matrix)`
	`178`	`+ if r == 0 or len(matrix[0])==0:`
	`179`	`+ return []`
	`180`	`+ c=len(matrix[0])`
	`181`	`+ res=matrix[0]`
	`182`	`+`
	`183`	`+ if r>1:`
	`184`	`+ for i in range (1,r):`
	`185`	`+ res.append(matrix[i][c-1])`
	`186`	`+ for j in range(c-2, -1, -1):`
	`187`	`+ res.append(matrix[r-1][j])`
	`188`	`+ if c>1:`
	`189`	`+ for i in range(r-2, 0, -1):`
	`190`	`+ res.append(matrix[i][0])`
	`191`	`+`
	`192`	`+ M=[]`
	`193`	`+ for k in range(1, r-1):`
	`194`	`+ e=matrix[k][1:-1]`
	`195`	`+ M.append(e)`
	`196`	`+`
	`197`	`+ return res+self.spiralOrder(M)`
	`198`	+```
`175`	`199`	`-----------------------`
`176`	`200`	`<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>`

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