def _trim_zeros(str_floats, na_rep='NaN'):
    """
    Trims zeros, leaving just one before the decimal points if need be.
    """
    trimmed = str_floats

    def _cond(values):
        non_na = [x for x in values if x != na_rep]
        return (len(non_na) > 0 and all([x.endswith('0') for x in non_na]) and
                not (any([('e' in x) or ('E' in x) for x in non_na])))

    while _cond(trimmed):
        trimmed = [x[:-1] if x != na_rep else x for x in trimmed]

    # leave one 0 after the decimal points if need be.
    return [x + "0" if x.endswith('.') and x != na_rep else x for x in trimmed]