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]
+high = len(num_list)-1
+low = 0
+a = 20
+
+while low <= high:
+    mid = (high + low)//2
+    b = num_list[mid]
+    if b == a:
+        print('找到了')
+        break
+    elif b < a:
+        low = mid + 1
+    elif b > a:
+        low = mid - 1
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