Python for syntax conversion

[kingsman]

from collections import namedtuple
from pprint import pformat
import re
import sys

TableRecord = namedtuple('TableRecord', ('table_name', 'rows'))

def table_data_lines(infile):
    for lineno, line in enumerate(infile, 1):
        if line.startswith('END TABLE DATA'):
            break
        line = line.strip()
        if line:
            yield lineno, line

def read_table(table_name, sequence, parsed_file):
    name = None
    rows = []
    last_row = []
    for lineno, line in sequence:
        if line.startswith('TABLE:'):
            name = line[6:].strip().strip('"')
            break
        continued = line.endswith('_')
        if continued:
            line = line[:-1].rstrip()
        L = re.split(r'(\w+)[=]', line)
        assert L[0] == ''
        last_row.extend((L[i], L[i+1].strip()) for i in range(1, len(L), 2))
        if not continued:
            rows.append(last_row)
            last_row = []
    parsed_file.append(TableRecord(table_name, rows))
    return name

I get what the table_data_lines is doing but I don't know the things in read_table.
what is the parameter inside (table_name, sequence, parsed_file)?