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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]
+# 使用二分查找法，找出9和20在列表里面的索引\
+num=20
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+low=0
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+high = len(num_list)-1
+while low <= high:
+    mid= (low+high) // 2
+    guess = num_list[mid]
+    if guess == num:
+        print("找到了")
+        break
+    elif guess < num :
+        low=mid+1
+    else:
+        high = mid-1    
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