arsh...@gmail.com wrote: > I am having some understandable behaviour from one of my function name > week_graph_data() which call two functions those return a big tuple of > tuples, But in function week_graph_data() line no. 30 does not > work(returns no result in graph or error). > > I have check both functions are called in week_graph_data() individually > and those run perfectly. (returning tuple of tuples) > > here is my code: pastebin.com/ck1uNu0U
> def week_list_func(): > """ A function returning list of last 6 days in 3-tuple""" > > date_list = [] > for i in xrange(7): > d=date.today() - timedelta(i) > t = d.year, d.month, d.day > date_list.append(t) > return reversed(date_list) reversed(date_list) returns an "iterator": >>> items = reversed(["a", "b", "c"]) >>> items <list_reverseiterator object at 0x7f43622e9a20> This means that iteration will "consume" the items >>> list(items) ['c', 'b', 'a'] >>> list(items) [] and thus work only once. To allow for multiple iterations you can return a list instead: >>> items = ["a", "b", "c"] >>> items.reverse() >>> items ['c', 'b', 'a'] >>> list(items) ['c', 'b', 'a'] >>> list(items) ['c', 'b', 'a'] Note that list.reverse() is a mutating method and by convention returns None. Therefore return date_list.reverse() # wrong! will not work, you need two lines date_list.reverse() return date_list in your code. -- https://mail.python.org/mailman/listinfo/python-list
