python二维数组如何转换类型

[['1', '255']][['256', '509'], ['510', '763'], ['764', '1017'], ['1018', '1271'],

['1272', '1526']]
如何转换成
===>
[[1, 255]][[256, 509], [510, 763], [764, 1017], [1018, 1271], [1272, 1526]]

下面的代码直接报错
data = [['1', '255']][['256', '509'], ['510', '763'], ['764', '1017'], ['1018', '1271'],

['1272', '1526']]
datadata = int(data)