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 <hitoko...@gmail.com <javascript:>> > 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 <hitoko...@gmail.com> 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 django-users...@googlegroups.com. > > To post to this group, send email to django...@googlegroups.com. > > 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 django-users...@googlegroups.com <javascript:>. > > To post to this group, send email to django...@googlegroups.com > <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/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 django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. 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.
