Some useful string tools

str_tools.py

def strjoin(*args, **kwargs):
    """ Concatenates the arguments, ignoring any arguments that are empty or
    None.
    """

    delim = kwargs.get('delim', '\n')

    res = ''
    first = True
    for arg in args:
        if arg:
            if not first:
                res += delim
            first = False
            res += arg
    return res