What does unix 'Parse' command do and how to handle it in python program

I have a python program, a parser, that reads in a text file that contains a list of sentences and outputs a parse tree corresponding to each sentence to stdout. For example, if one of the sentences in the text file is:

"take the blue cube"

the program will output the following parse tree result:

'(S(Verb take)(NP(Det the)(Adj blue)(Noun cube)))'

My question is that my program should be able to handle the following command line:

> - Parse file1 file2

where: file1 is a file that contains a set of sentences to parse file2 is a file that contains parsed results

I would appreciate if someone could let me know what the 'Parse' command does and/or give me a general idea of what needs to be done to incorporate it into my python program. I'm new to command line, so I'm not sure if this is a unix command that I don't know about. Does this mean that my program needs to read in the text file1 with sentences and redirect the results to file2?

Thanks in advance for the help!