AttributeError:DemoOperator实例没有属性“optr\u jumlah”

Question

在我的类DemoOperator中，结果显示AttributeError:DemoOperator实例没有属性“optr\u jumlah”。请告诉我哪里是编码错误和修改什么。你知道吗

#program latian

class DemoOperator:
    def __init__(self):
        #input data x dan y
        x = raw_input("Masukkan x : ")
        y = raw_input("Masukkan y : ")

        self.optr_jumlah(int(x), int(y))
        self.optr_kurang(int(x), int(y))
        self.optr_kali(int(x), int(y))
        self.optr_bagi(int(x), int(y))
        self.optr_modulus(int(x), int(y))

        def optr_jumlah(self, a, b):
            a += b
            print "x += y hasilnya ",a

        def optr_kurang(self, a, b):
            a -= b
            print "x -= y hasilnya ",a

        def optr_kali(self, a, b):
            a *= b
            print "x *= y hasilnya ",a

        def optr_bagi(self, a, b):
            a /= b
            print "x /= y hasilnya ",a

        def optr_modulus(self, a, b):
            a %= b
            print "x %= y hasilnya ",a

if __name__ == '__main__':
    aplikasi = DemoOperator()

下面是上面代码显示的一些错误：

Traceback (most recent call last):
  File "E:\Kuliah\python\demoOperator.py", line 34, in <module>
    aplikasi = DemoOperator()
  File "E:\Kuliah\python\demoOperator.py", line 7, in __init__
    self.optr_jumlah(int(x), int(y))
AttributeError: DemoOperator instance has no attribute 'optr_jumlah'

谢谢你回答我的问题。你知道吗