(self)
return self.size == 1
Checks to see if the permutation contains only one number and is
        thus the only possible permutation of this set of numbers

        Examples
        ========

        >>> from sympy.combinatorics import Permutation
        >>> Permutation([0]).is_Singleton
        True
        >>> Permutation([0, 1]).is_Singleton
        False

        See Also
        ========

        is_Empty
Checks to see if the permutation contains only one number and is
        thus the only possible permutation of this set of numbers
Checks to see if the permutation contains only one number and is thus the only possible permutation of this set of numbers
def is_Singleton(self):
        """
        Checks to see if the permutation contains only one number and is
        thus the only possible permutation of this set of numbers

        Examples
        ========

        >>> from sympy.combinatorics import Permutation
        >>> Permutation([0]).is_Singleton
        True
        >>> Permutation([0, 1]).is_Singleton
        False

        See Also
        ========

        is_Empty
        """
        return self.size == 1
def is_Singleton ( self ) : return self . size == 1