pyparser.py 文件源码

def parse_file_keeplines(lines, require_order=None):
    r"""
    >>> def gen_lines(x):
    ...     yield "# field:int\n"
    ...     for i in range(x):
    ...         yield "%s\n" % (test_field,)
    >>> parsed = parse_file_keeplines(gen_lines(2))
    >>> next(parsed)
    '# field:int\n'
    >>> test_field = 1; next(parsed)
    ('1\n', Rec(field=1))
    >>> test_field = 2; next(parsed)
    ('2\n', Rec(field=2))
    """
    lines_iter, lines_iter_parse = tee(iter(lines), 2)
    try:
        yield next(lines_iter)
    except StopIteration:
        raise Exception("No header")
    for line, rec in izip(lines_iter, parse_file(lines_iter_parse)):
        yield line, rec