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]
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+import random
+a = []
+for i in range(1,101):
+    a.append(i)
+
+num = random.choice(a)
+
+def binary_search(alist,num):
+    low = 0
+    high =len(alist)-1
+    while low<= high:
+        mid = (low + high)//2
+        guess = alist[mid]
+        if guess < num:
+            low = mid +1
+        elif guess == num:
+            return mid
+        else:
+            high = mid-1
+    return None
+
+result = binary_search(a,num)
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