Python – How to Change and Update Dictionary Values
Modifying Values in a Python Dictionary
In Python, dictionaries are mutable data structures that allow you to store key-value pairs.
If you need to modify the value associated with a specific key, you can do so by referencing that key directly.
Example: Changing the value associated with the key "year":
thisdict = {
"brand": "Ford",
"model": "Mustang",
"year": 1964
}
thisdict["year"] = 2018
In the example above, the original value of "year" was 1964.
By assigning a new value using thisdict["year"] = 2018, the dictionary is updated accordingly.
Using update() to Modify Dictionary Entries
Python also provides the update() method, which is used to update a dictionary with key-value pairs from another dictionary or an iterable object.
This approach is particularly useful for updating multiple values simultaneously.
Example: Updating the dictionary using update():
thisdict = {
"brand": "Ford",
"model": "Mustang",
"year": 1964
}
thisdict.update({"year": 2020})
The update() method takes a dictionary as an argument. In this example, the key "year" is updated from 1964 to 2020.
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