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] <javascript:> > > *From:* François Schiettecatte <javascript:> > *Date:* 2014-06-10 22:07 > *To:* django-users <javascript:> > *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] <javascript:>> > 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 > > > > > > > > > > > > > > > > > > -- > > > You received this message because you are subscribed to the Google > Groups "Django users" group. > > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected]. > > > To post to this group, send email to [email protected]. > > > Visit this group at http://groups.google.com/group/django-users. > > > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-users/cf982ef6-1398-4292-9001-eab418f2035a%40googlegroups.com. > > > > > For more options, visit https://groups.google.com/d/optout. > > > > > > > > > -- > > > You received this message because you are subscribed to the Google > Groups "Django users" group. > > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected]. > > > To post to this group, send email to [email protected]. > > > Visit this group at http://groups.google.com/group/django-users. > > > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-users/2347967a-55c4-400b-9bf3-7aacc4f27311%40googlegroups.com. > > > > > For more options, visit https://groups.google.com/d/optout. > > > > > > -- > > You received this message because you are subscribed to the Google > Groups "Django users" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] <javascript:>. > > To post to this group, send email to [email protected] > <javascript:>. > > Visit this group at http://groups.google.com/group/django-users. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-users/4bfaf57c-fd97-4543-b6d1-d479fe3d43e4%40googlegroups.com > . > > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > To post to this group, send email to [email protected] > <javascript:>. > Visit this group at http://groups.google.com/group/django-users. > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-users/7B064353-8567-4B33-BA7C-97BF08A45764%40gmail.com > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/3015c174-52e5-419c-9854-d089fa533921%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
