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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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+n=20
+hight=len(num_list)-1
+low=0
+while True:
+    mid=(low+hight)//2
+    if num_list[mid]==n:
+        print('y')
+        break
+    elif num_list[mid]<n:
+        low=mid+1
+    elif hight>low:
+        print('m')
+        break
+    else:
+        hight=mid-1