save project

my_search.py

-import random
+import random #不到啊！
 
-alist = []
-for i in range(1, 101):
+alist = [] #初始化列表
+for i in range(1, 101): #生成列表
     alist.append(i)
 num = random.choice(alist)
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 
-def pythonNB(alist,num):
+def pythonNB(alist,num): #定义函数
     high = len(alist)-1
-    low = 0
-    while low <= high:
-        mid = (low + high) // 2
+    low = 0 #定义变量
+    while low <= high: #重复执行
+        mid = (low + high) // 2 #设置
         guess = alist[mid]
-        if guess == num:
-            return mid
-        elif guess < num:
-            low = mid + 1
+        if guess == num: #如果猜的数等于正确的数
+            return mid #返回mid值（猜的值）
+        elif guess < num: #猜的数小于正确的数
+            low = mid + 1 #将最小值-1
         else:
-            high = mid - 1
-    return None
-cnm = pythonNB(alist,num)
-print(cnm)
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+            high = mid - 1 #将最大值+1
+    return None #错误
+cnm = pythonNB(alist,num) #调用函数，复制给“草泥马”
+print(cnm) #打印答案
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