Hi,Harrison. Your method is cool. But i doubt this, if bList and aList just are attached to the same List when i write bList=aList,but why the output of the following two code are different?
code1: aList=[1,2,3,4,5,6,7,8,9,10] bList=aList bList=str(bList) print aList print aList[2] code2: aList=[1,2,3,4,5,6,7,8,9,10] aList=str(aList) print aList print aList[2] i'm puzzled now. 2012/7/4 Harrison Morgan <harrison.mor...@gmail.com> > > > On Wed, Jul 4, 2012 at 12:38 AM, levi nie <levinie...@gmail.com> wrote: > >> that's good,thanks. >> new problem. >> when i write >> bList=aList >> del bList[2] >> bList and aList both change,how can i make aList not changed? >> >>> >> > Lists are mutable. That means that when you do bList = aList, you're just > creating another reference to aList. They both point to the same list, just > using different names. You should read up a bit on immutable vs. mutable > objects. Here's something that I found that might explain it a bit better. > http://henry.precheur.org/python/copy_list >
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