import re


def split_alpha_number(symbol):
    """
    分离字母开头，然后接数字的情况，如果后面有别的字符会被截断
    print(split_alpha_number("TF1703.CFE"))
    ('TF', '1703')
    :param symbol:
    :return:
    """
    pattern = re.compile(r'([A-Za-z]+)(\d+)')
    match = pattern.match(symbol)
    if match:
        return match.group(1, 2)
    return None