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binary_search.py

 # 使用二分查找法，找出9和20在列表里面的索引
 # 使用二分查找法，找出9和20在列表里面的索引
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
\ No newline at end of file
+a=20
+l=0
+h=len(num_list)-1
+while l<=h:
+    m=(l+h)//2
+    if num_list[m]==a:
+        print('找到了，索引值是：',m)
+        break 
+    elif num_list[m]>a:
+        h=
+    elif num_list[m]<a:
+        l= 
\ No newline at end of file