谁能详细的解释一下每一步的意思啊，这个好多不懂-慕课网

谁能详细的解释一下每一步的意思啊，这个好多不懂

来源：6-4 python中 __len__

qq_采蘑菇的小兔子_0

2017-09-11 20:56

class Fib(object):
def __init__(self, num):
a, b, L = 0, 1, []
for n in range(num):
L.append(a)
a, b = b, a + b
self.numbers = L

def __str__(self):
return str(self.numbers)

__repr__ = __str__

def __len__(self):
return len(self.numbers)

f = Fib(10)
print f
print len(f)

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2回答

qq_慕神1420022

2022-03-31 18:37:28

不对吧，变量$P的值应该是字符串PI1，而不是3.14吧，“PI1”上面有双引号，$p=quot;PI1quot;;
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0 0
大Ykkkk3551189

2017-09-12 11:57:24

__init__ 初始化生成斐波那契数列L，传入num是其长度，range（num）就是num次循环；斐波那契数列是以0， 1开头的，后一位为前两位之和，所以初始化前两位为a，b = 0， 1 所以第三位就是a+b，将第一位a存入列表L，第一次循环生成第三位，一二位往后挪一位，所以a=b， b=a+b；循环完毕，列表生成完毕。
__str__ 用函数str()将列表转换成string，并返回
__len__ 函数len()，返回列表L长度

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