parameters: (self, a)
return_statement: return a.is_signed()
docstring: Return True if the operand is negative; otherwise return False.
  
          >>> ExtendedContext.is_signed(Decimal('2.50'))
          False
          >>> ExtendedContext.is_signed(Decimal('-12'))
          True
          >>> ExtendedContext.is_signed(Decimal('-0'))
          True
docstring_summary: Return True if the operand is negative; otherwise return False.
docstring_tokens: Return True if the operand is negative ; otherwise return False .
function: def is_signed(self, a):
          """Return True if the operand is negative; otherwise return False.
  
          >>> ExtendedContext.is_signed(Decimal('2.50'))
          False
          >>> ExtendedContext.is_signed(Decimal('-12'))
          True
          >>> ExtendedContext.is_signed(Decimal('-0'))
          True
          """
          return a.is_signed()
function_tokens: def is_signed ( self , a ) : return a . is_signed ( )