python嵌套列表

从excel读取一行信息添加到一个临时列表，最后将所有行的列表添加到一个大列表。

源码：

import xlrd,re
class Info():
    def read_info(self):
        data = xlrd.open_workbook('tmp_info.xlsx')
        table = data.sheets()[0]
        # row_val = table.row_values(0)
        info_list = []
        tmp_list = []
        for i in range(1,table.nrows):
            tmp = table.row_values(i)
            for j in range(3):
                val = re.sub(' ','',tmp[j].encode('utf-8'))
                val = re.sub('#','',val)
                if len(tmp[2]) > 50:
                    val = re.sub('_','',val)
                tmp_list.append(val)
            info_list.append(tmp_list)
            tmp_list = []                   # must clear it
        return info_list
t = Info()
print t.read_info()