Python check if the partial part of text is quoated

is_quoated.py

# coding=utf-8
"""
"""
__author__ = 'Alisue <lambdalisue@hashnote.net>'
import re

pattern = re.compile("[^'\"]")


def is_quoated(text, s, e):
    p = pattern.sub('', text[0:s])
    n = pattern.sub('', text[e:-1])
    return len(p) > 0 and len(n) > 0 and (len(p) * len(n)) % 2 != 0


def __unittest__():
    #         0123456789012345678901234
    text = """N'Y'N'Y'N"Y"N"Y'Y'Y"N"Y"N"""
    # N
    assert is_quoated(text, 0, 1) is False
    # N'
    assert is_quoated(text, 0, 2) is False
    # N'Y
    assert is_quoated(text, 0, 3) is False
    # N'Y'
    assert is_quoated(text, 0, 4) is False

    # '
    assert is_quoated(text, 1, 2) is False
    # 'Y
    assert is_quoated(text, 1, 3) is False
    # 'Y'
    assert is_quoated(text, 1, 4) is False
    # 'Y'N
    assert is_quoated(text, 1, 5) is False

    # Y
    assert is_quoated(text, 2, 3) is True
    # Y'
    assert is_quoated(text, 2, 4) is False
    # Y'N
    assert is_quoated(text, 2, 5) is False
    # Y'N'
    assert is_quoated(text, 2, 6) is True
    # Y'N'Y
    assert is_quoated(text, 2, 7) is True
    # Y'N'Y'
    assert is_quoated(text, 2, 8) is False

if __name__ == '__main__':
    __unittest__()