How can I update values in a list in python?

Question

I have a list of tuples looking like this:

[(5, 0, 1, 8), (5, 0, 1, 14, 15), (5, 0, 1, 14, 16)]

I also have a dictionary that is in the form:

{0: [], 1: [], 2: [], 3: [], 4: [], 5: ['CVE-2016-3379'], 7: ['CVE-2016-3646'], 8: [], 9: ['CVE-2015-1769'], 10: ['CVE-2016-3364', 'CVE-2016-7193', 'CVE-2016-3363'], 14: [], 15: ['CVE-2015-1769'], 16: ['CVE-2016-3363', 'CVE-2016-7193', 'CVE-2016-3364'], 17: [], 18: [], 19: [], 20: [], 21: ['CVE-2015-1769'], 22: ['CVE-2016-3363', 'CVE-2016-7193', 'CVE-2016-3364'], 26: [], 27: [], 28: [], 29: [], 30: [], 32: []}

How can I update the values in the first list with the values from the dictionary?

I want 5 for example to become 5: ['CVE-2016-3379'], 0 to become 0: [] etc.

Show us what you've already tried. SO isn't a code-writing service. — Chris Johnson
– Chris Johnson, Commented Nov 2, 2017 at 15:59
Please put that info in your question, where it belongs. And it's pointless putting multi-line Python code into comments since the indentation gets lost. — PM 2Ring
– PM 2Ring, Commented Nov 2, 2017 at 16:03
Thank you for the answer. This is not a coding assisgnment, it is a part of a project that is confidential and my python skills are not that great. — Nick
– Nick, Commented Nov 2, 2017 at 16:12

ettanany · Accepted Answer · 2017-11-02 16:13:25Z

3

You can do that with this list comprehension:

res = [tuple('{}: {}'.format(i, my_dict[i]) for i in t) for t in my_list]

Example of output:

>>> my_list = [(5, 0, 1, 8)]
>>> my_dict = {0: [], 1: [], 5: ['CVE-2016-3379'], 8: []}
>>> res = [tuple('{}: {}'.format(i, my_dict[i]) for i in t) for t in my_list]
>>> res
[("5: ['CVE-2016-3379']", '0: []', '1: []', '8: []')]

edited Nov 2, 2017 at 16:13

answered Nov 2, 2017 at 16:07

ettanany

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1 Comment

user2390182 Over a year ago

Quite possible that this is what the OP means by his desired output :)

user2390182 · Accepted Answer · 2017-11-02 16:02:07Z

1

Given your list is called lst and the dict is called dct, you can use the following nested comprehension:

lst = [tuple(dct[x] for x in tpl) for tpl in lst]

Since the tuples in your list are immutable, you can not just update their cells. You have to rebuild them with the new values.

answered Nov 2, 2017 at 16:02

user2390182

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