Error with "argparse.ArgumentParser" in python

Question

This is giving a wierd error:

if __name__ == "__main__":
    import argparse
    import json

    from evaluation import cross_validation
    from predictor import PhraseSentimentPredictor

    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("filename")
    config = parser.parse_args()
    config = json.load(open(config.filename))

Error:

**usage: generate_kaggle_submission.py [-h] filename
    generate_kaggle_submission.py: error: too few arguments**

Please help

Can you show how you are running the program?

Karl Knechtel
– Karl Knechtel

2014-12-21 15:08:25 +00:00
Commented Dec 21, 2014 at 15:08 — Karl Knechtel
– Karl Knechtel, Commented Dec 21, 2014 at 15:08

falsetru · Accepted Answer · 2014-12-21 15:07:33Z

2

Make sure you invoke the python program with the filename argument.

If you want to make the filename argument optional, specify nargs with ? or *:

parser.add_argument("filename", nargs='?')
# OR with default
parser.add_argument("filename", nargs='?', default='default_filename')

See nargs - argparse - Python documentation for other available options.

answered Dec 21, 2014 at 15:07

falsetru

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