save project

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]
\ No newline at end of file
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+num = 9
+low = 0
+high = len(num_list)-1
+while high >= low:
+    mid = (low+high)//2
+    guess_num = num_list[mid]
+    if guess_num == num:
+        print('找到啦')
+        break
+    else:
+        if guess_num < num:
+            low = mid+1
+        else:
+            high = mid-1
+#return None
+#print('没有')
+    if high < low:
+        print('meiy')
+        break
+
+
+