short CSV parser in python

csv_parser.py

from typing import Iterable, List


def parse_line(line: str) -> List[str]:
    words = list()

    quote_character = None
    escaped = False
    word = ""

    for ch in line:
        if escaped:
            word += ch
            escaped = False

        elif quote_character:
            if ch == "\\":
                escaped = True
            elif ch == quote_character:
                words.append(word)
                word = ""
                quote_character = None
            else:
                word += ch

        else:
            if ch in ("'", '"'):
                quote_character = ch

    return words


def parse_csv(lines: Iterable[str]) -> Iterable[List[str]]:
    for line in lines:
        yield parse_line(line)


#
# example parser input
#
example_input = """
'hello',"world"
"q'uoted",'with"parentheses',
'with"in\\'between',"la\\\\st",'words'
"works",   'also with blank spaces'
""".strip()

#
# executing parser
#
output = parse_csv(example_input.splitlines())

#
# compare with expected outcome
#
assert list(output) == [
    ["hello", "world"],
    ["q'uoted", 'with"parentheses'],
    ["with\"in'between", "la\\st", "words"],
    ["works", "also with blank spaces"],
]