save project

binary_search.py

+import random
 # 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]
+
+list_1 = []
+for i in range(101):
+    list_1.append(i)
+
+def cha(list,num): 
+    low = 0
+    high = len(list) - 1
+    a = 0
+    while low <= high:
+        mid = (low+high) // 2
+        guess = list[mid]
+        if guess == num:
+            return mid
+            break
+        elif guess < num:
+            low = mid + 1
+        else:
+            high = mid - 1
+    return None
+
+#cha(num_list,9)
+
+
+b = random.randint(0,150)
+a = cha(list_1,b)
+print(a)
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