def __str__(self):
    'The method transforms the 2D polynomial object into its str\n        representation.\n\n        Returns\n        -------\n        object: str\n            string representation of the object\n        '
    rstring = str(self.norder)
    for key in self.twodkeys:
        rstring += str(key)
    return rstring
The method transforms the 2D polynomial object into its str
representation.

Returns
-------
object: str
    string representation of the object
def __str__(self):
    'The method transforms the 2D polynomial object into its str\n        representation.\n\n        Returns\n        -------\n        object: str\n            string representation of the object\n        '
    rstring = str(self.norder)
    for key in self.twodkeys:
        rstring += str(key)
    return rstring