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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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+bingo_num = 20
+s = 9
+num_list = [1, 3, 5, 8, 11, 9, 15, 17, 18, 20, 21]
+low = 0
+high = len(num_list)-1
+
+
+while low <= high:
+    mid = (low+high) // 2
+    guess_num =num_list[mid]
+    if guess_num ==bingo_num:
+        print('找到了，它在列表里的索引是：',mid)
+        break
+    elif guess_num < bingo_num:
+        low =mid+1
+    elif guess_num > bingo_num:
+        high = mid-1
+while low <= high:
+    m = (low+high) // 2
+    g =num_list[m]
+    if g ==s:
+        print('找到了，它在列表里的索引是：',m)
+        break
+    elif g  < s:
+        low =m+1
+    elif g > s:
+        high = m-1
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