勘误：Array.clear 方法有误

Author: PegasusWang

docs/02_数组和列表/array_and_list.md

@@ -48,3 +48,7 @@ list.remove                           | O(n)           |
 [Python list implementation](https://www.laurentluce.com/posts/python-list-implementation/)
 
 [https://github.com/python/cpython/blob/master/Objects/listobject.c](https://github.com/python/cpython/blob/master/Objects/listobject.c)
+
+
+# 勘误
+视频里的 Array.clear 方法有误。应该是 `for i in range(len(self._items))`，已经在后续所有使用到 Array 的代码里修正

docs/02_数组和列表/array_and_list.py

@@ -27,7 +27,7 @@ def __len__(self):
         return self._size
 
     def clear(self, value=None):
-        for i in range(self._items):
+        for i in range(len(self._items)):
             self._items[i] = value
 
     def __iter__(self):

docs/04_队列/array_queue.py

@@ -18,7 +18,7 @@ def __len__(self):
         return self._size
 
     def clear(self, value=None):
-        for i in range(self._items):
+        for i in range(len(self._items)):
             self._items[i] = value
 
     def __iter__(self):

docs/07_哈希表/hashtable.py

@@ -19,7 +19,7 @@ def __len__(self):
         return self._size
 
     def clear(self, value=None):
-        for i in range(self._items):
+        for i in range(len(self._items)):
             self._items[i] = value
 
     def __iter__(self):

docs/08_字典/dict_adt.py

@@ -19,7 +19,7 @@ def __len__(self):
         return self._size
 
     def clear(self, value=None):
-        for i in range(self._items):
+        for i in range(len(self._items)):
             self._items[i] = value
 
     def __iter__(self):

docs/15_堆与堆排序/heap_and_heapsort.py

@@ -19,7 +19,7 @@ def __len__(self):
         return self._size
 
     def clear(self, value=None):
-        for i in range(self._items):
+        for i in range(len(self._items)):
             self._items[i] = value
 
     def __iter__(self):

docs/16_优先级队列/priority_queue.py

@@ -19,7 +19,7 @@ def __len__(self):
         return self._size
 
     def clear(self, value=None):
-        for i in range(self._items):
+        for i in range(len(self._items)):
             self._items[i] = value
 
     def __iter__(self):