want to store elements in array or list using python

Question

I am learning python. I want to store one by one element in array or list. this is my code.

for u in durl:
      p2 = requests.get(u)
      tree = html.fromstring(p2.content)
      dcode.append = tree.xpath(ecode)
      print(dcode)

in dcode variable the elements are overriding not appending. i want to insert it one by one. please help me.

Possible duplicate of [append vs. extend](http://stackoverflow.com/questions/252703/append-vs-extend) — Ami Tavory, Aug 26 '16 at 11:52

score 2 · Answer 1 · answered Aug 26 '16 at 12:02

2

append is a method not a variable so if you want to append tree.xpath(ecode) to dcode then you should write dcode.append(tree.xpath(ecode)) rather than dcode.append = which is an assignment not a method call.

answered Aug 26 '16 at 12:02

Owen Doyle

175
8

score 0 · Answer 2 · answered Aug 26 '16 at 11:51

0

tree.xpath(...) returns a list so if you want to merge it with an existing list dcode of selected elements, you might do

dcode.extend(tree.xpath(ecode))

answered Aug 26 '16 at 11:51

ewcz

12,819
1
25
47

but it was giving again error like dcode is not defined – virushree Aug 26 '16 at 12:54

score 0 · Answer 3 · answered Aug 26 '16 at 12:15

You can do it this way, it appends new value to the list and it makes more sense...sort of data structure

def main(decode=[]):
  for u in durl:
      p2 = requests.get(u)
      tree = html.fromstring(p2.content)
      dcode.append(tree.xpath(ecode))
      print(dcode)

want to store elements in array or list using python

3 Answers3