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Groups > comp.lang.python > #99179
| From | srinivas devaki <mr.eightnoteight@gmail.com> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: How To Create A Endles List Of Lists In Python...??? |
| Date | 2015-11-20 23:58 +0530 |
| Message-ID | <mailman.15.1448044148.2291.python-list@python.org> (permalink) |
| References | <n2miu8$fl4$1@ls237.t-com.hr> <mailman.510.1448009596.16136.python-list@python.org> <n2mugp$kt1$1@ls237.t-com.hr> <564F1AC0.5040106@shopzeus.com> <CAPTjJmpJoktL=OdaCOw3KGukxUKBu+nW+cUFvwv47KCczAKXsg@mail.gmail.com> |
On Fri, Nov 20, 2015 at 6:39 PM, Chris Angelico <rosuav@gmail.com> wrote:
> My crystal ball suggests that defaultdict(list) might be useful here.
>
> ChrisA
I used something similar to this for some problem in hackerrank,
anyway i think this is what you want.
class defaultlist(object):
def __init__(self, factory, data=None):
self.factory = factory
self.list = []
self.data = data
def __getitem__(self, x):
if x >= len(self.list):
self.list.extend([self.factory() for _ in
range(len(self.list), x + 1)])
return self.list[x]
def __repr__(self):
return str(self)
def __str__(self):
if len(self.list) == 0:
return '(' + str(self.data) + ')[...]'
return ''.join(['(', str(self.data), ')['] + map(str,
self.list) + [', ...]'])
def __setitem__(self, x, v):
if x >= len(self.list):
self.list.extend([self.factory() for _ in
range(len(self.list), x + 1)])
self.list[x] = v
def main():
factory = lambda: defaultlist(factory)
list_of_lists = defaultlist(factory)
print (list_of_lists[0])
list_of_lists[0][10].data = 20
print (list_of_lists[0])
main()
Gist: https://gist.github.com/c0c2ee1e7c6535ef8c3d
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How To Create A Endles List Of Lists In Python...??? "HKRSS" <hkrss@gmail.com> - 2015-11-20 08:43 +0100
Re: How To Create A Endles List Of Lists In Python...??? "HKRSS" <hkrss@gmail.com> - 2015-11-20 09:13 +0100
Re: How To Create A Endles List Of Lists In Python...??? Peter Otten <__peter__@web.de> - 2015-11-20 09:53 +0100
Re: How To Create A Endles List Of Lists In Python...??? "HKRSS" <hkrss@gmail.com> - 2015-11-20 12:00 +0100
Re: How To Create A Endles List Of Lists In Python...??? Nagy László Zsolt <gandalf@shopzeus.com> - 2015-11-20 14:06 +0100
Re: How To Create A Endles List Of Lists In Python...??? robert.bralic@si.t-com.hr - 2015-11-20 05:29 -0800
Re: How To Create A Endles List Of Lists In Python...??? Chris Angelico <rosuav@gmail.com> - 2015-11-21 00:09 +1100
Re: How To Create A Endles List Of Lists In Python...??? Grant Edwards <invalid@invalid.invalid> - 2015-11-20 15:58 +0000
Re: How To Create A Endles List Of Lists In Python...??? srinivas devaki <mr.eightnoteight@gmail.com> - 2015-11-20 23:58 +0530
Re: How To Create A Endles List Of Lists In Python...??? srinivas devaki <mr.eightnoteight@gmail.com> - 2015-11-21 00:05 +0530
Re: How To Create A Endles List Of Lists In Python...??? Denis McMahon <denismfmcmahon@gmail.com> - 2015-11-20 17:14 +0000
Re: How To Create A Endles List Of Lists In Python...??? robert.bralic@si.t-com.hr - 2015-11-20 10:16 -0800
Re: How To Create A Endles List Of Lists In Python...??? Ian Kelly <ian.g.kelly@gmail.com> - 2015-11-20 11:29 -0700
Re: How To Create A Endles List Of Lists In Python...??? Chris Angelico <rosuav@gmail.com> - 2015-11-21 05:30 +1100
Re: How To Create A Endles List Of Lists In Python...??? sohcahtoa82@gmail.com - 2015-11-20 11:26 -0800
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