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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]
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+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low = 0
+hight = len(num_list)-1
+
+num = 20
+while True:
+    mid = (low + hight) // 2
+    guess = num_list[mid]
+    if guess == num:
+        print('找到了：' + str(guess))
+        break
+    elif low > hight:
+        print('没找到')
+        break
+    elif guess < num:
+        low = mid + 1
+    elif guess > num:
+        hight = mid - 1
+    
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