unicode_utils.py

import re


def is_valid_id_start(num):
    """Returns True if the Unicode character represented by num is a
    valid ID_Start according to the Unicode specification, False otherwise."""
    pattern = re.compile(r'[$_\p{ID_Start}]', re.UNICODE)
    return pattern.match(chr(num)) is not None


def is_valid_id_part(num):
    """Returns True if the Unicode character represented by num is a
    ID_Continue according to the Unicode specification, False otherwise.
    """
    pattern = re.compile(r"^\p{ID_Continue}$")
    return pattern.match(chr(num)) is not None