1 #!/usr/bin/env python
   2 
   3 class Calculadora():
   4     def soma(self,a,b):
   5         ''' Soma os valores a e b.
   6         >>> calc = Calculadora()
   7         >>> calc.soma(2,2)
   8         4
   9         '''
  10         return a+b
  11 
  12     def subtracao(self,a,b):
  13         ''' Subtrai os valores a e b.
  14         >>> calc = Calculadora()
  15         >>> calc.subtracao(4,2)
  16         2
  17         '''
  18         return a-b
  19 
  20 if __name__ == '__main__':
  21     import doctest
  22     doctest.testmod()