Python dictionary append – DEV Community

March 25, 2023

Python dictionary is a collection key value pair, unlike like python list, values in dictionary are stored and accessed using key, where in list we will use index.

In list to append a value, we can use a inbuild list method append to add a value to list.

l = [1,2,3,4,5]

# Output:
1, 2, 3, 4, 5, 6
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Append a value to dictionary

To add a new value to dictionary, simply use the assignment operator, if the key value is not in dict, python will add a new entry. If the key is already exist in dict then it will update the value

d = { "a": 1, "b": 2 }
d["c"] = 3

# Output
{ "a": 1, "b": 2, "c": 3 }

d["c"] = 20

# Output
{ "a": 1, "b": 20, "c": 3 }

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