Python中的元组Subtract语句

Question

使用Python,我想从列表中的值减去256,如果值大于256,但我所要的输出是一个元组的格式,这是我需要帮助.

x = [85, 229, 162, 45, 280, 186, 275, 265, 252, 188, 135, 150, 351, 326, 217, 43, 301, 281, 333, 39, 246, 150, 139, 186, 195, 132, 196, 171, 307, 272, 97, 330, 271, 179, 276, 141, 151, 214, 191, 111, 261, 290, 146]

for y in x:
    if y>256:
        print y-256
    else:
        print y 

此代码将以列表格式提供正确的输出.

Answer 1

获取列表使用列表理解/生成器表达式.

>>> x = [85, 229, 162, 45, 280, 186, 275, 265, 252, 188, 135, 150, 351, 326, 217, 43, 301, 281, 333, 39, 246, 150, 139, 186, 195, 132, 196, 171, 307, 272, 97, 330, 271, 179, 276, 141, 151, 214, 191, 111, 261, 290, 146]
>>> [y - 256 if y > 256 else y for y in x]
[85, 229, 162, 45, 24, 186, 19, 9, 252, 188, 135, 150, 95, 70, 217, 43, 45, 25, 77, 39, 246, 150, 139, 186, 195, 132, 196, 171, 51, 16, 97, 74, 15, 179, 20, 141, 151, 214, 191, 111, 5, 34, 146]
>>> tuple(y - 256 if y > 256 else y for y in x)
(85, 229, 162, 45, 24, 186, 19, 9, 252, 188, 135, 150, 95, 70, 217, 43, 45, 25, 77, 39, 246, 150, 139, 186, 195, 132, 196, 171, 51, 16, 97, 74, 15, 179, 20, 141, 151, 214, 191, 111, 5, 34, 146)