Appending to an empty list - Python

Question

posts = []

#response = feedparser.parse(url)

# existing titles is equivalent to [x['title'] for x in posts]
existing_titles = []
for x in posts:
   existing_titles.append(x['title'])

What is this code suppose to do? How to append elements to an empty list within an empty list? I have seen this stackoverflow above that puts the append in every value of list, but im not still quite understanding what this code does because of x['title'], since posts is empty

Question that you linked is different than what you have asked. There might be some code in between `posts = []` and `existing_titles = []` which is updating `posts`. — nobleknight, May 08 '21 at 07:49
What does it do currently? From the looks of it it does nothing. What it looks like it should be doing is taking the dictionary entry named title from each entry in the posts list — el_oso, May 08 '21 at 07:50

score 0 · Accepted Answer · edited May 08 '21 at 14:32

0

posts is a map of list with same key i believe, something like .

[{'title':'Test'},{'title':'this is test'},{'title':'en'},{'title':'tech'}]

edited May 08 '21 at 14:32

LoahL

2,404
1
9
24

answered May 08 '21 at 07:52

Dinkar kumar

16

posts[] shoudnt be there, right?. its stupid, right? – Jimmy Hiluzzi May 08 '21 at 07:56
Yes, @JimmyHiluzzi it seems, but we cannot say for sure unless we have context – Dinkar kumar May 08 '21 at 08:00
Believe me, it is, I changed the code. Sorry for the wasted time. – Jimmy Hiluzzi May 08 '21 at 08:01

Appending to an empty list - Python

1 Answers1