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I am currently writing a Python script and trying to dynamically generate some arguments. However, an error is being thrown for the following script, stating 'Namespace' object is not iterable. Any ideas on how to fix? import argparse from os import path import re replacements = {} pattern = '<<([^>]*)>>' def user_replace(match): ## Pull from replacements dict or prompt placeholder = match.group(1) return (replacements[placeholder][0] if placeholder in replacements else raw_input('%s? ' % placeholder)) def main(): parser = argparse.ArgumentParser() parser.add_argument('infile', type=argparse.FileType('r')) parser.add_argument('outfile', type=argparse.FileType('w')) required, extra = parser.parse_known_args() infile, outfile = required.infile, required.outfile args = re.findall(pattern, infile.read()) args = list(set(args)) infile.seek(0) parser = argparse.ArgumentParser() for arg in args: parser.add_argument('--' + arg.lower()) replacements = vars(parser.parse_args(extra)) matcher = re.compile(pattern) for line in args.infile: new_line = matcher.sub(user_replace, line) args.outfile.write(new_line) args.infile.close() args.outfile.close() if __name__ == '__main__': main() The error is with the returned value of parser.parse_known_args(). Any ideas on how I could bypass this though? Someone suggested creating an object and using the dict interface, but I don't know what this entails exactly. I'm really new to Python, so I don't understand why (infile, outfile), extra = parser.parse_known_args() wouldn't work. Edit: Updated with two fixes. First fixed the error above by using the accepted answer below. Second, also fixed an error where I was getting flagged for trying to add the same argument twice. Fixed by making args a set then back to a list. Now my

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