def remove_chars(str_, char_list):
    """
    removes all chars in char_list from str_

    Args:
        str_ (str):
        char_list (list):

    Returns:
        str: outstr

    Example:
        >>> # ENABLE_DOCTEST
        >>> from utool.util_str import *  # NOQA
        >>> str_ = '1, 2, 3, 4'
        >>> char_list = [',']
        >>> result = remove_chars(str_, char_list)
        >>> print(result)
        1 2 3 4
    """
    outstr = str_[:]
    for char in char_list:
        outstr = outstr.replace(char, '')
    return outstr