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binary_search.py

@@ -5,12 +5,12 @@ num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 
 
 low = 0
 low = 0
 high = len(num_list)-1
 high = len(num_list)-1
-
-mid = (low + high)//2
-guess = num_list[mid]
-if guess == num:
-    print("找到了",mid)
-elif guess < num:
-    low = mid + 1
-else:
-    high = mid - 1
+while low <= high:
+    mid = (low + high)//2
+    guess = num_list[mid]
+    if guess == num:
+        print("找到了")
+    elif guess < num:
+        low = mid + 1
+    else:
+        high = mid - 1
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