python - parsing a drugbank.xml file -

am trying out code github.com on drugbank xml file. keep getting error messsage:

usage: drugbank.py [-h] --input input drugbank.py: error: following arguments required: --input/-i 

being new python, mean? here long code:

def run(input):     """writes relational database text files drugs, drug_target, drug_target_action, , targets tables.     input: path of drugbank xml file.     output: text files can used inputs sql tables.     method:         1. read , parse xml file.         2. extract data , save records key, value pairs.         3. write output files."""     #output file names     drugs_out = input + '.drugs.txt'     drug_target_out = input + '.drug_target.txt'     drug_target_action_out = input + '.drug_target_action.txt'     targets_out = input + '.targets.txt'      #counter number of records in each file     record_counts = counter()      #open input file , parse xml     #get drugbank namspace     print('reading , parsing xml file.')     tree = etree.elementtree(file=input)     #a few namespace tricks make code more readable     ns = tree.getroot().nsmap     ns['db'] = ns[none]     del ns[none]      drugs = tree.xpath('db:drug', namespaces=ns)      code........   def main():      #command line arguments     parser = argparse.argumentparser(         description='writes relational database text files drugs, drug_target, drug_target_action, , targets',         epilog='drugbankxml2db 1.0β1 ©2014 michael yourshaw rights reserved',     )     parser.add_argument('--input', '-i', required=true,                         help='drug bank xml file downloaded http://www.drugbank.ca/system/downloads/current/drugbank.xml.zip',)     args = parser.parse_args()      run(input=args.input)  if __name__ == "__main__": sys.exit(main()) 

your script requires specify value --input argument:

parser.add_argument('--input', '-i', required=true,                     help='drug bank xml file downloaded http://www.drugbank.ca/system/downloads/current/drugbank.xml.zip',) 

required=true means have include -i or --input when running script.

you supposed download indicated url yourself, unzip file, point script with:

drugbank.py -i drugbank.xml