Method to_str_or_unicode_or_none

_plotly_utils/basevalidators.py:1016–1024

Convert a value to a string if it's not None, a string, or a unicode (on Python 2).

(v)

    @staticmethod
    def to_str_or_unicode_or_none(v):
        """
        Convert a value to a string if it's not None, a string,
        or a unicode (on Python 2).
        """
        if v is None or isinstance(v, str):
            return v
        else:
            return str(v)

    def description(self):
        desc = """\