diff --git a/python/05_array/myarray.py b/python/05_array/myarray.py
index 6ff0562..03a07ec 100644
--- a/python/05_array/myarray.py
+++ b/python/05_array/myarray.py
@@ -1,4 +1,6 @@
 from typing import Optional
+
+
 #
 # 1) Insertion, deletion and random access of array
 # 2) Assumes int for element type
@@ -15,7 +17,7 @@ class MyArray:
         self._data = []
         self._count = 0
         self._capacity = capacity
-    
+
     def __getitem__(self, position: int) -> int:
 
         """Support for subscript.
@@ -25,30 +27,33 @@ class MyArray:
 
     def find(self, index: int) -> Optional[int]:
 
-        if index >= self._count or index <= -self._count: return None
+        if index >= self._count or index <= -self._count:
+            return None
         return self._data[index]
 
     def delete(self, index: int) -> bool:
-        
-        if index >= self._count or index <= -self._count: return False
-        
-        self._data[index:-1] = self._data[index+1:]
+
+        if index >= self._count or index <= -self._count:
+            return False
+
+        self._data[index:-1] = self._data[index + 1:]
         self._count -= 1
         # 真正将数据删除并覆盖原来的数据 ，这个需要增加
         self._data = self._data[0:self._count]
-        print ('delet function',self._data)
+        print('delete function', self._data)
         return True
 
     def insert(self, index: int, value: int) -> bool:
 
-        #if index >= self._count or index <= -self._count: return False
-        if self._capacity == self._count: return False
+        # if index >= self._count or index <= -self._count: return False
+        if self._capacity == self._count:
+            return False
         # 如果还有空间，那么插入位置大于当前的元素个数，可以插入最后的位置
         if index >= self._count:
             self._data.append(value)
         # 同上，如果位置小于0 可以插入第０个位置.
         if index < 0:
-            print (index)
+            print(index)
             self._data.insert(0, value)
 
         self._count += 1
@@ -56,14 +61,15 @@ class MyArray:
 
     def insert_to_tail(self, value: int) -> bool:
 
-        if self._count == self._capacity: return False
+        if self._count == self._capacity:
+            return False
         if self._count == len(self._data):
-            self._data.append(value) 
+            self._data.append(value)
         else:
             self._data[self._count] = value
         self._count += 1
         return True
-    
+
     def __repr__(self) -> str:
 
         return " ".join(str(num) for num in self._data[:self._count])
@@ -71,25 +77,31 @@ class MyArray:
     def print_all(self):
 
         for num in self._data[:self._count]:
-            print("{num}", end=" ")
+            print(f"{num}", end=" ")
         print("\n", flush=True)
 
+
+def test_myarray():
+    array_a = MyArray(6)
+    for num in range(6):
+        array_a.insert_to_tail(num)
+    assert array_a.find(0) == 0
+    assert array_a[0] == 0
+    array_a.delete(0)
+    assert array_a[0] == 1
+
+
 if __name__ == "__main__":
     a = MyArray(6)
     for i in range(6):
         a.insert_to_tail(i)
-    
-<<<<<<< HEAD
     a.delete(2)
     print(a)
     a.insert_to_tail(7)
     print(a)
-=======
-    print('origin',a)
+    print('origin', a)
     a.delete(4)
-    print ('delete ',a)
+    print('delete ', a)
 
-    a.insert(100,10000)
-    print (a)
-
->>>>>>> upstream/master
+    a.insert(100, 10000)
+    print(a)