物件導向-迭代器

標籤：對象   一個   ati   def   ISE   print   ==   列印   end   

建立一個迭代器的類

class Foo:    def __init__(self,n):        self.n = n    def __iter__(self): #將對象變成一個可迭代對象        return self    def __next__(self):  #迭代器需要一個next方法        if self.n == 100:            raise StopIteration(‘終止‘)        self.n += 1        return self.nf1 = Foo(10)for i in f1: #iter(f1) == f1.__iter__()    print(i)‘‘‘111213141516171819...‘‘‘

列印斐波拉且數列

class Fib:    def __init__(self):        self._a = 1        self._b =1        print(self._a,self._b,end=‘  ‘)    def __iter__(self):        return self    def __next__(self):        if self._b>1000:            raise StopIteration("stopd")        self._a,self._b=self._b,self._a+self._b        return self._a,self._ba = Fib()for i in a:    print(i[1],end=‘  ‘)‘‘‘1 1  2  3  5  8  13  21  34  55  89  144  233  377  610  987  1597 ‘‘‘

物件導向-迭代器