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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
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+
+goal = 15
+low = 0
+high = len(num_list)-1
+
+while low<=high:
+    mid = (low+high)//2
+    num = num_list[mid]
+    if num==goal:
+        print("索引:",mid)
+        break
+    elif num<goal:
+        low = mid+1
+    else:
+        high = mid-1
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