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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]
\ No newline at end of file
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+# 中间值：guess
+# 要找的数字：num
+# 最低索引：low
+# 最高索引：high
+# 中间值索引：mid
+num = int(input("输入要找的数字："))
+low=0
+high=len(num_list)-1
+while low<=high:
+    mid=(low+high)//2
+    guess=num_list[mid]
+    if num==guess:
+        print("找到了！索引是：",mid)
+        break
+    elif guess<num:
+        low=mid+1
+    else:
+        high=mid-1
+