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
-bingo_num = 20
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
-low = 0
-high = len (num_list)-1
+import random
 
 
-while low <= high:
-    mid = (low + high)//2
-    guess_num = num_list[mid]
-    if guess_num == bingo_num:
-        print('找到了，数字是：',mid)
-        break
-    elif bingo_num > guess_num:
-        low = mid+1
-    else:
-        high = mid-1
+
+alist = []
+for i in range(1,100):
+    alist.append(i)
+num = random.choice(alist)
+
+def binary_search(alist,num):
+    low = 0
+    high = len (alist)-1
+
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+    while low <= high:
+        mid = (low + high)//2
+        guess_num = alist[mid]
+        if guess_num == num:
+            return mid
+        elif guess_num < num:
+            low = mid+1
+        else:
+            high = mid-1
+    return None
+result = binary_search(alist,num)
+print(num)
+print(result)
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