a couple of things I don't understand wrt lists
Ned Batchelder
ned at nedbatchelder.com
Wed Apr 17 14:36:34 EDT 2013
On 4/17/2013 12:10 PM, 88888 Dihedral wrote:
> Serhiy Storchaka於 2013年4月17日星期三UTC+8下午5時35分07秒寫道:
>> 17.04.13 07:57, Larry Hudson написав(ла):
>>
>>> So using a list comprehension you can do it in two lines:
>>> def get_rule(num):
>>> bs = bin(num)[2:]
>>> return [0] * (8 - len(bs)) + [int(i) for i in bs]
>>
>>
>> You can do it in one line!
>>
>>
>>
>> def get_rule(num):
>>
>> return list(map(int, '{:08b}'.format(num)))
> Well, a new object is returned and can be used.
> Then who is going to clean up the object when required?
This is a key thing to understand about Python: memory is managed
automatically, no one has to clean up the object. Once there are no
names referring to the object, it will be cleaned up automatically.
--Ned.
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