On Fri, Oct 3, 2014 at 9:04 PM, Bhargav Kowshik < bhargav.kows...@yahoo.com.dmarc.invalid> wrote:
> Nice! Thank you very much Anand.But, I still don't know what is > happening.Please point me to a resource to understand what is happening. > > A common beginner mistake. More of such gotcha can be found here http://docs.python-guide.org/en/latest/writing/gotchas/ . > ** Program ** > > def flat_it(values, result=list()): > for v in values: > if isinstance(v, list): > flat_it(v, result) > else: > result.append(v) > return result > > x = [[1, 2, [3, 7]], 4] > > print('Input: {0}'.format(x)) > print('Output 1: {0}'.format(flat_it(x))) > print('Output 2: {0}'.format(flat_it(x))) > print('Output 3: {0}'.format(flat_it(x, list()))) > > ** Output ** > Input: [[1, 2, [3, 7]], 4] > Output 1: [1, 2, 3, 7, 4] > Output 2: [1, 2, 3, 7, 4, 1, 2, 3, 7, 4] > Output 3: [1, 2, 3, 7, 4] > > Thank you, > Bhargav. > > > On Friday, October 3, 2014 8:48 PM, Anand Chitipothu < > anandol...@gmail.com> wrote: > > > > On Fri, Oct 3, 2014 at 8:26 PM, Bhargav Kowshik > <bhargav.kows...@yahoo.com.dmarc.invalid> wrote: > > We could use what Anand talked about at Pycon India about handling the > headers in first row of a CSV.In this scenario, instead of default for > result being None and checking if None everytime, we could have the default > value an empty list. > > def flat_it(values, result=list()): > for v in values: > if isinstance(v, list): > flat_it(v, result) > else: > result.append(v) > return result > > x = [[1, 2, [3, 4, 5, 6, 7]], 4] > print x > print flat_it(x) > > > Thats a pitfall! Try calling flat_it once again and see what you get. > Anand > > > > _______________________________________________ > BangPypers mailing list > BangPypers@python.org > https://mail.python.org/mailman/listinfo/bangpypers > -- *Thanks & Regardskracekumar"Talk is cheap, show me the code" -- Linus Torvaldshttp://kracekumar.com <http://kracekumar.com>* _______________________________________________ BangPypers mailing list BangPypers@python.org https://mail.python.org/mailman/listinfo/bangpypers
