Python argparse - pass file without using command line

I want to pass file using form-data to the argparse. But i'm not getting how to pass file to the argparse without using command-line. I also gone through the [https://stackoverflow.com/questions/31090479/python-argparse-pass-values-without-command-line] this solution but this is not helpful for me.

I want to pass file using form-data.

this is my code:

       def get_parser():

        parser = argparse.ArgumentParser(
        description='Capital gains calculator')

        parser.add_argument('infile', nargs='?',  
                  type=argparse.FileType('r'),
                 default=sys.stdin)`

can anyone help?

Thanks

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