[]运算符在python中打开文件的目的是什么

Question

I see the following syntax in one of the python files. I can understand that it is reading the file. But I am not sure what the [0][0] are used for

lines = open (config[0][0], 'r').readlines()

My config file looks like

py0:max0
py1:max1
py2
py3  

Could someone please share your comments

Answer 1

A small modification makes the code better understandable:

filename = config[0][0]
lines = open(filename, 'r').readlines()

You obtain the file name from a variable that contains a list of lists, and then this file is opened and all lines read.