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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _read_password_from_pgpass( *, passfile: typing.Optional[pathlib.Path], hosts: typing.List[str], ports: typing.List[int], database: str, user: str):
 """Parse the pgpass file and return the matching password. :return: Password string, if found, ``None`` otherwise. """


    passtab = _read_password_file(passfile)
    if not passtab:
        return None

    for host, port in zip(hosts, ports):
        if host.startswith('/'):
            # Unix sockets get normalized into 'localhost'
            host = 'localhost'

        for phost, pport, pdatabase, puser, ppassword in passtab:
            if phost != '*' and phost != host:
                continue
            if pport != '*' and pport != str(port):
                continue
            if pdatabase != '*' and pdatabase != database:
                continue
            if puser != '*' and puser != user:
                continue

            # Found a match.
            return ppassword

    return None