Update 0054.螺旋矩阵.md

for loop version of python3 solution

Author: janeyziqinglin

problems/0054.螺旋矩阵.md

@@ -171,6 +171,30 @@ class Solution:
 
         return res
 ```
-
+```python3
+class Solution:
+    def spiralOrder(self, matrix: List[List[int]]) -> List[int]:
+        r=len(matrix)
+        if r == 0 or len(matrix[0])==0: 
+            return []
+        c=len(matrix[0])
+        res=matrix[0]
+        
+        if r>1: 
+            for i in range (1,r):
+                res.append(matrix[i][c-1])
+            for j in range(c-2, -1, -1):
+                res.append(matrix[r-1][j])
+            if c>1:    
+                for i in range(r-2, 0, -1):    
+                    res.append(matrix[i][0])
+                    
+        M=[]
+        for k in range(1, r-1):
+            e=matrix[k][1:-1]
+            M.append(e)
+            
+        return res+self.spiralOrder(M) 
+```        
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