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