python - Open file in different directory -


i've written function , want open file in subdirectory 'data'. 

def _save_exrates(date, rates):     """     saves exchange rates data date 'date' in appropriate exchange      rates file, described below.     """     file = open(os.path.join('data', 'rates-'+date+'.csv'), 'wt')     w = csv.writer(file, lineterminator='\n')     w.writerow(['code', 'rate'])     key, value in sorted(rates.items()):         w.writerow([key, value])     file.close()

my program working on windows when run on mac error:

filenotfounderror: [errno 2] no such file or directory: 'data/rates-2001-03-03.csv'

how can open directory on mac windows?

make sure create directory before creating file inside that.


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