utilities.py 文件源码

def valid_name(name):
    r"""Determine whether or not the given string is a valid
    alphanumeric string.

    Parameters
    ----------
    name : str
        An alphanumeric identifier.

    Returns
    -------
    result : bool
        ``True`` if the name is valid, else ``False``.

    Examples
    --------

    >>> valid_name('alpha')   # True
    >>> valid_name('!alpha')  # False

    """
    identifier = re.compile(r"^[^\d\W]\w*\Z", re.UNICODE)
    result = re.match(identifier, name)
    return result is not None