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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]
+n = len(num_list)
+num = 20
+low = 0
+high = n-1
+while True:
+    mid = (low+high)//2
+    if num == num_list[mid]:
+        print("找到了，是列表的第",mid+1,"个数据")
+        break
+    elif low >high:
+        print("没找到")
+        break
+    elif num < num_list[mid]:
+        high = mid - 1
+    else:
+        low = mid + 1
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