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]
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+def shu(num):
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+    low = 0
+    hight = len(num_list)-1
+    mid =0
+    while True:
+        mid = (low+hight)//2
+        guess = num_list[mid]
+        if guess == num:
+            print(str(num)+'在列表中的索引是：'+str(mid))
+            break
+        if low > hight:
+            print('没有这个数字')
+            break
+        if guess < num:
+            low = mid + 1
+        else:
+            hight = mid - 1
+shu(13)
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