输入数据的标准传递给python解析工具

I am trying to build a python script to parse a huge amount of data. I will be generating data from an existing tool which will be parsed by python tool and put into an excel sheet. I haven't yet figured out how the input data has to be. Is there any particular format or patterns anyone would suggest to make parsing easier? The approach in my mind is to use regular expressions and find places in junk data to identify blocks and such. I am trying to build a python script to parse a