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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
+cz1 = 9
+cz2 = 20
+cd = len(num_list)
+low = 0
+high = cd - 1
+while low<=high:
+    mid = (low + high)//2
+    if cz1 == num_list[mid]:
+        print("找到了！，索引是", mid)
+        break
+    elif cz1 < num_list[mid]:
+        high = mid - 1
+    else:
+        low = mid + 1
+if low > high:
+    print("没找到!")
\ No newline at end of file