(self, flipconv)
flipconv is either 'astro' or 'geo'. None will be default.

        With 'astro', east is toward left and west toward right.
        It is the opposite for 'geo'
flipconv is either 'astro' or 'geo'. None will be default.
flipconv is either astro or geo . None will be default .
def set_flip(self, flipconv):
        """flipconv is either 'astro' or 'geo'. None will be default.

        With 'astro', east is toward left and west toward right.
        It is the opposite for 'geo'
        """
        if flipconv is None:
            flipconv = "astro"  # default
        if flipconv == "astro":
            self._flip = -1
        elif flipconv == "geo":
            self._flip = 1
        else:
            raise ValueError("flipconv must be 'astro', 'geo' or None for default.")
def set_flip ( self , flipconv ) : if flipconv is None : flipconv = "astro" # default if flipconv == "astro" : self . _flip = - 1 elif flipconv == "geo" : self . _flip = 1 else : raise ValueError ( "flipconv must be 'astro', 'geo' or None for default." )