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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]
-f=0
-d=20
-sa=
-v=len(num_list)-1
-while v>f:
-    sa= (v+f)//2
-    guess_num==num_list[sa]
-    if guess_num==d:
-        print('到'sa)
-        break
-    elif guess_num<d:
-        f=sa+1
-    elif guess_num:
-        v=sa-1
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