parameters: (self, a)
return_statement: return a.is_snan()
docstring: Return True if the operand is a signaling NaN;
          otherwise return False.
  
          >>> ExtendedContext.is_snan(Decimal('2.50'))
          False
          >>> ExtendedContext.is_snan(Decimal('NaN'))
          False
          >>> ExtendedContext.is_snan(Decimal('sNaN'))
          True
          >>> ExtendedContext.is_snan(1)
          False
docstring_summary: Return True if the operand is a signaling NaN;
          otherwise return False.
docstring_tokens: Return True if the operand is a signaling NaN ; otherwise return False .
function: def is_snan(self, a):
          """Return True if the operand is a signaling NaN;
          otherwise return False.
  
          >>> ExtendedContext.is_snan(Decimal('2.50'))
          False
          >>> ExtendedContext.is_snan(Decimal('NaN'))
          False
          >>> ExtendedContext.is_snan(Decimal('sNaN'))
          True
          >>> ExtendedContext.is_snan(1)
          False
          """
          a = _convert_other(a, raiseit=True)
          return a.is_snan()
function_tokens: def is_snan ( self , a ) : a = _convert_other ( a , raiseit = True ) return a . is_snan ( )