CSV reader using generator with the ability to slice

csv_parser.py

def parse_csv_file(filename, start=0, stop=None, step=1):
    """
    Parses a csv file.
    start - elements from the iterable are skipped until start is reached
    stop - if None, continue iteration until iterator is exhausted or until stop is reached
    step - skip items before returning value; useful for skipping headers etc
    """
    with open(filename, 'r') as csv_file:
        for row in csv.DictReader(
            itertools.islice(csv_file, start, stop, step), skipinitialspace=True
        ):
            yield row