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binary_search.py

@@ -3,17 +3,13 @@ num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 num = 9
 num = 9
 low = 0
 low = 0
 high = len(num_list)-1
 high = len(num_list)-1
-while True:
-    if high >= low:
-        mid = (low+high)//2
-        guess = num_list[mid]
-        if guess == num:
-            print("找到了",mid)
-            break
-        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",mid)
+        break
+    elif guess < num:
+        low = mid + 1
     else:
     else:
-        print("没找到")
-        break
+        high = mid - 1
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