Python Dictionary Methods Cheat Sheet
Learn Python dictionary methods. Complete reference guide for key-value pair insertions, retrievals, updates, and checks.
Dictionary Access & Modification
Common operations to retrieve or alter dictionary items.
| Method | Syntax | Description |
|---|---|---|
| get() | my_dict.get(key, default=None) | Returns the value for the key if it exists, else returns a default value. |
| update() | my_dict.update(other_dict) | Updates the dictionary with key-value pairs from another dictionary/iterable. |
| pop() | my_dict.pop(key, default) | Removes and returns the value for the specified key. |
| clear() | my_dict.clear() | Removes all items from the dictionary. |
Dictionary Iteration & Views
Methods that return dynamic view objects of dictionary elements.
| Method | Syntax | Description |
|---|---|---|
| keys() | my_dict.keys() | Returns a view object of all keys in the dictionary. |
| values() | my_dict.values() | Returns a view object of all values in the dictionary. |
| items() | my_dict.items() | Returns a view object containing (key, value) tuple pairs. |
Frequently Asked Questions
Why use get() instead of dict[key]?
dict[key] raises a KeyError if the key does not exist. get() returns None or a specified default value instead of crashing.
How do I merge two dictionaries in Python?
In Python 3.9+, you can use the union operator: dict1 | dict2. Or, use the dict1.update(dict2) method.
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