Append a list of tuples into a existing dictionary

Question

I have an existing dictionary and I want to add a list of tuples into this dictionary.

Existing dictionary structure:

myD = {'key1': 123 , 'key2': 456}

List of tuples structure:

myL = [('fkey1',321),('fkey2',432),('fkey3',543)]

Expected dictionary after adding list of tuples

myD = {'key1': 123 ,'key2': 456 ,'fkey': 321 ,'fkey2': 432 ,'fkey3': 543}

How can I implement this in python?

Possible duplicate of [List of tuples to dictionary](https://stackoverflow.com/questions/6522446/list-of-tuples-to-dictionary) — Anand Tripathi, Jun 21 '18 at 13:05

score 10 · Accepted Answer · edited Jun 21 '18 at 13:01

10

Just use dict.update.

>>> myD = {'key1': 123 , 'key2': 456}
>>> myL = [('fkey1',321),('fkey2',432),('fkey3',543)]
>>> 
>>> myD.update(myL)
>>> 
>>> myD
{'key2': 456, 'key1': 123, 'fkey1': 321, 'fkey2': 432, 'fkey3': 543}

edited Jun 21 '18 at 13:01

Aran-Fey

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answered Jun 21 '18 at 13:00

timgeb

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score 4 · Answer 2 · answered Jun 21 '18 at 12:59

use simple for loop statment

myD = {'key1': 123 , 'key2': 456}

myL = [('fkey1',321),('fkey2',432),('fkey3',543)]

for k, v in myL:
    myD[k] = v

print(myD)

or use update

myD.update(myL)                                                                                                                                                                                              

print(myD)

Output

{'key1': 123, 'key2': 456, 'fkey1': 321, 'fkey2': 432, 'fkey3': 543}

Rakesh · Answer 3 · 2018-06-21T13:02:30.630

4

Use dict.update

Ex:

myD = {'key1': 123 , 'key2': 456}
myL = [('fkey1',321),('fkey2',432),('fkey3',543)]
myD.update(myL)
print(myD)

Output:

{'key2': 456, 'key1': 123, 'fkey1': 321, 'fkey2': 432, 'fkey3': 543}

edited Jun 21 '18 at 13:02

answered Jun 21 '18 at 13:00

Rakesh

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No need to convert `myL` to a dict: `myD.update(myL)` will work just fine. – Duncan Jun 21 '18 at 13:01
Sorry that was a typo. – Rakesh Jun 21 '18 at 13:02

score 0 · Answer 4 · answered Jun 21 '18 at 13:59

0

Dictionary unpacking:

>>> >>> myD = {'key1': 123 , 'key2': 456}
>>> myL = [('fkey1',321),('fkey2',432),('fkey3',543)]
>>> {**myD, **dict(myL)}
{'key1': 123, 'key2': 456, 'fkey1': 321, 'fkey2': 432, 'fkey3': 543}

answered Jun 21 '18 at 13:59

RoadRunner

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Append a list of tuples into a existing dictionary

4 Answers4