Wouldn't the deep copy module handle this for you:
https://docs.python.org/2/library/copy.html
François
On Jun 10, 2014, at 12:17 PM, hito koto <[email protected]> wrote:
> Hi, Qiancong :
>
> I was looking for exactly this、
> Thank you ver much!
>
>
> 2014年6月10日火曜日 23時35分52秒 UTC+9 Qiancong:
>
> Hi, hito koto:
> I think you want to deep copy the list. The following code maybe helpful:
> def dcopy(obj):
> if not isinstance(obj, list):
> return obj
> return [dcopy(x) for x in obj]
>
> But this function only deep copy for list. You can change code as what I did
> for dic, set, tuple , etc ..
> [email protected]
>
> From: François Schiettecatte
> Date: 2014-06-10 22:07
> To: django-users
> Subject: Re: Django python fuction
> You need to use .append() to add elements to a list, I suggest you take a
> look at the python tutorial:
>
> https://docs.python.org/2/tutorial/
>
> Not quite sure what you are doing with i or elem either.
>
> François
>
> On Jun 10, 2014, at 10:01 AM, hito koto <[email protected]> wrote:
>
> > So, I also have errors:
> >
> >
> > >>> def foo(x):
> > ... myList = []
> > ... if isinstance(x, list):
> > ... for i in x:
> > ... elem = i
> > ... return myList + foo(elem)
> > ... else:
> > ... return 1
> > ...
> > >>>
> > >>> foo(a)
> > Traceback (most recent call last):
> > File "<stdin>", line 1, in <module>
> > File "<stdin>", line 6, in foo
> > File "<stdin>", line 6, in foo
> > TypeError: can only concatenate list (not "int") to list
> >
> >
> >
> >
> >
> > 2014年6月10日火曜日 22時53分28秒 UTC+9 François Schiettecatte:
> > You are redefining 'list' on line 2, rename list to myList as follows:
> >
> > def foo(x):
> > myList = []
> > if isinstance(x, list):
> > for i in x:
> > elem = i
> > return myList + foo(i)
> > else:
> > return 1
> >
> > And take this to a python list, this is for django.
> >
> > Cheers
> >
> > François
> >
> >
> > On Jun 10, 2014, at 9:43 AM, hito koto <[email protected]> wrote:
> >
> > > hi,
> > >
> > > I have this erroes:
> > >
> > > >>> def foo(x):
> > > ... list = []
> > > ... if isinstance(x, list):
> > > ... for i in x:
> > > ... elem = i
> > > ... return list + foo(i)
> > > ... else:
> > > ... return 1
> > > ...
> > > >>> foo(a)
> > > Traceback (most recent call last):
> > > File "<stdin>", line 1, in <module>
> > > File "<stdin>", line 3, in foo
> > > TypeError: isinstance() arg 2 must be a class, type, or tuple of classes
> > > and types
> > >
> > >
> > >
> > > 2014年6月10日火曜日 22時27分42秒 UTC+9 Andrew Farrell:
> > > In general, I recommend adding the line "import pdb;pdb.set_trace()"
> > > to the top of your function and walking through it to see why it doesn't
> > > work.
> > >
> > > def foo(x):
> > > import pdb;pdb.set_trace()
> > >
> > > list = []
> > > if isinstance(x, list):
> > > for i in x:
> > > elem = i
> > > return list + foo(i)
> > > else:
> > > return 1
> > >
> > > See https://docs.python.org/2/library/pdb.html on how pdb works.
> > > There are faster ways to debug, but when starting out, pdb lets you see
> > > what is happening as you run the function.
> > >
> > >
> > > Some questions I have about this function:
> > > - What is the purpose of the "elem" function? It is never accessed.
> > > - What is the purpose of returning 1 if the argument is not a list?
> > > - Why is it named "foo" rather than something that tells me what the
> > > purpose of the function is?
> > >
> > >
> > > On Tue, Jun 10, 2014 at 8:16 AM, hito koto <[email protected]> wrote:
> > > Hello,
> > >
> > > I don't know how can i do to change to write python function
> > > I want to following code change to write python function or change to
> > > write recursive definition
> > > >>> y = [10, 12, [13, [14, 9], 16], 7]
> > > >>> z = copy.deepcopy(y)
> > > >>> y
> > > [10, 12, [13, [14, 9], 16], 7]
> > > >>> z
> > > [10, 12, [13, [14, 9], 16], 7]
> > > >>> z[2][1][1]
> > > 9
> > > >>> z[2][1][1] = 88
> > > >>> z
> > > [10, 12, [13, [14, 88], 16], 7]
> > > [10, 12, [13, [14, 9], 16], 7]
> > > >>>
> > >
> > > this is my use function but not work:
> > >
> > > def foo(x):
> > > list = []
> > > if isinstance(x, list):
> > > for i in x:
> > > elem = i
> > > return list + foo(i)
> > > else:
> > > return 1
> > >
> > >
> > >
> > >
> > >
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