kalkulator.py

class Kalkulator:

	def __call__(self, fungsi, a, b):
		if fungsi == 'tambah':
			return self.tambah(a, b)
		if fungsi == 'kurang':
			return self.kurang(a, b)
		if fungsi == 'kali':
			return self.kali(a, b)
		if fungsi == 'bagi':
			return self.bagi(a, b)

	def tambah(self, a, b):
		return a + b

	def kurang(self, a, b):
		return a - b

	def kali(self, a, b):
		return a * b

	def bagi(self, a, b):
		return float(a) / b


calc = Kalkulator()

print calc('tambah', 1, 2)
print calc('kurang', 1, 2)
print calc('kali', 1, 2)
print calc('bagi', 1, 2)