market_variables.py 文件源码

def allvars(expr):
    r"""Get the list of valid names in the expression.

    Parameters
    ----------
    expr : str
        A valid expression conforming to the Variable Definition Language.

    Returns
    -------
    vlist : list
        List of valid variable names.

    """
    regex = re.compile('\w+')
    items = regex.findall(expr)
    vlist = []
    for item in items:
        if valid_name(item):
            vlist.append(item)
    return vlist


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