The formatted data in file is similar to YAML and would like to create a grammer and parser for it. What is the easies way to do this in Python? Is there a tool that let you define a grammer for your data and parses according to the grammer?
P.S. I know the easier way to do this might be to change the data formate into JSON or other type but right now it can't be changed
Look into pyparsing. It's a pretty simple library, but it is also quite powerful.