How to convert a list of dicts to a CSV file

dictlist2csv.py

def dict2csv(dictlist, csvfile):
    """
    Takes a list of dictionaries as input and outputs a CSV file.
    """
    f = open(csvfile, 'wb')

    fieldnames = dictlist[0].keys()

    csvwriter = csv.DictWriter(f, delimiter=',', fieldnames=fieldnames)
    csvwriter.writerow(dict((fn, fn) for fn in fieldnames))
    for row in dictlist:
        csvwriter.writerow(row)
    fn.close()