1,for循环
1 nums = list() 2 3 a = 0 4 b = 1 5 i = 0 6 7 while i<10: 8 nums.append(a) 9 a,b = b,a+b 10 i += 1 11 12 for num in nums: 13 print(num)
除了for循环能接受可迭代对象，list、tuple等也能接收
1 a = (11,22,33) 2 # list() 不是简单的类型转换 是迭代的方式在a里面取值，重新生成列表 然后append()到列表中 3 #用tuple（）转换的时候也一样用到迭代器 4 b = list(a) 5 print(b)
2.class
1 class Feibonacci(): 2 def __init__(self,all_num): 3 self.all_num = all_num 4 self.a = 0 5 self.b = 1 6 self.current_num = 0 7 8 def __iter__(self): 9 return self 10 11 12 def __next__(self): 13 if self.current_num < self.all_num: 14 ret = self.a # ? 能理解，但想不到用这种方法 15 self.a,self.b = self.b,self.a+self.b 16 self.current_num += 1 17 return ret 18 else: 19 raise StopIteration 20 21 febo = Feibonacci(10) 22 23 for num in febo: 24 print(num)
3.我能理解的class迭代器方式
1 class Feibonacci(): 2 def __init__(self,all_num): 3 self.all_num = all_num 4 self.a = 0 5 self.b = 1 6 self.nums = list() 7 self.current_num = 0 8 9 def __iter__(self): 10 return self 11 12 13 def __next__(self): 14 if self.current_num < self.all_num: 15 self.nums.append(self.a) 16 self.a,self.b = self.b,self.a+self.b 17 ret = self.nums[self.current_num] 18 self.current_num += 1 19 return ret 20 else: 21 raise StopIteration 22 23 febo = Feibonacci(10) 24 25 for num in febo: 26 print(num)
