doctest - Qiita

class Cal(object): def add_num_and_double(self, x, y): """Add and double >>> c = Cal() >>> c.add_num_and_double(1,1) 4 >>> c.add_num_and_double('1', '1') Traceback (most recent call last): ... ValueError """ if type(x) is not int or type(y) is not int: raise ValueError result = x + y result *= 2 return result if __name__ == '__main__': import doctest doctest.testmod()