Remove element in a list inside a dictionary with python

Question

I have this json structure:

{
  "http://marvel.wikia.com/wiki/Virginia_Potts_(Earth-33900)": [
    "/wiki/Virginia_Potts_(Earth-616)",
    "/wiki/Earth-33900",
    "/wiki/Stark_Industries_(Earth-33900)",
    "/wiki/AAFES_Vol_1_15",
    "/wiki/Washington_State",
    "/wiki/Pepper_Potts",
    "/wiki/Tom_Grummett",
    "/wiki/William_Harms",
    "/wiki/Virginia_Potts_(Earth-616)#Abilities",
    "/wiki/Seattle"
  ],
  "http://marvel.wikia.com/wiki/Virginia_Potts_(Earth-5631)": [
    "/wiki/Pepper_Potts",
    "/wiki/Earth-5631",
    "/wiki/Iron_Man_and_Power_Pack_Vol_1_1",
    "/wiki/Marc_Sumerak"
  ],
...

I want to iterate over the json and for each item verify if one of its links (it's a list of links) is not contained in another json with a complete list of characters (in the following code it's characters). In this case I want to eliminate the link from the list. At the end save the dictionary (links_ref) in a file.

for item in links_ref:
        for link in links_ref[item]:
            if link not in characters:
                links_ref[item].pop(link)
json.dump(links_ref, open('links_raf.json', 'w'))

This code of course doesn't work, I tried also with del link but, even if it didn't launch an exception, it didn't remove the link from the list too.

Hope someone can help me, I'm new to python so I'll be more than happy if you can suggest a better solution to my problem. Thank you

Ozgur Vatansever · Accepted Answer · 2016-04-05 21:32:22Z

3

You can't modify the list while you are iterating over it. You can make use of list comprehensions though in order to filter out the links:

for item, links in links_ref.items():
    links_ref[item] = [link for link in links if link in characters]

answered Apr 5, 2016 at 21:32

Ozgur Vatansever

52.5k17 gold badges89 silver badges122 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Gio Bact Over a year ago

Wasn't exactly my solution but it helped me a lot. Thanks

George Sovetov · Accepted Answer · 2016-04-05 21:37:18Z

0

Immutable way:

filtered_links_ref = {i: [l for l in links_ref[i] if l not in characters] for i in links_ref}

Or try to use sets:

character_set = frozenset(characters)
filtered_links_ref = {i: frozenset(links_ref[i]) - character_set for i in links_ref}

answered Apr 5, 2016 at 21:37

George Sovetov

5,3286 gold badges43 silver badges59 bronze badges

Collectives™ on Stack Overflow

Remove element in a list inside a dictionary with python

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related