Python Dict Methods

Python dict methods

Created By: chatGPT

In Python, dictionaries are versatile data structures that store key-value pairs. They come with several built-in methods that allow you to interact with the data easily. Here is an overview of some of the most important dictionary methods.

`get()`

The get() method retrieves a value for a specified key. If the key is not found, it returns None or a specified default value.

Example:

my_dict = {'name': 'John', 'age': 30}
print(my_dict.get('name'))  # Output: John
print(my_dict.get('gender', 'Not specified'))  # Output: Not specified

`keys()`

The keys() method returns a view object that displays a list of all the keys in the dictionary.

my_dict = {'name': 'John', 'age': 30}
print(my_dict.keys())  # Output: dict_keys(['name', 'age'])

`values()`

The values() method returns a view object that displays a list of all the values in the dictionary.

my_dict = {'name': 'John', 'age': 30}
print(my_dict.values())  # Output: dict_values(['John', 30])

`items()`

The items() method returns a view object that displays a list of the dictionary's key-value pairs as tuples.

my_dict = {'name': 'John', 'age': 30}
print(my_dict.items())  # Output: dict_items([('name', 'John'), ('age', 30)])

`update()`

The update() method updates the dictionary with elements from another dictionary or from an iterable of key-value pairs. If the key already exists, its value is updated.

my_dict = {'name': 'John', 'age': 30}
my_dict.update({'age': 31, 'city': 'New York'})
print(my_dict)  # Output: {'name': 'John', 'age': 31, 'city': 'New York'}

`pop()`

The pop() method removes the specified key and returns the corresponding value. If the key is not found, a default value can be specified.

my_dict = {'name': 'John', 'age': 30}
age = my_dict.pop('age', 'Not Found')
print(age)  # Output: 30
print(my_dict)  # Output: {'name': 'John'}

`clear()`

The clear() method removes all items from the dictionary.

my_dict = {'name': 'John', 'age': 30}
my_dict.clear()
print(my_dict)  # Output: {}

`copy()`

The copy() method returns a shallow copy of the dictionary.

my_dict = {'name': 'John', 'age': 30}
copied_dict = my_dict.copy()
print(copied_dict)  # Output: {'name': 'John', 'age': 30}
print(copied_dict is my_dict)  # Output: False

`setdefault()`

The setdefault() method returns the value of a specified key. If the key does not exist, it inserts the key with a specified default value.

my_dict = {'name': 'John'}
age = my_dict.setdefault('age', 30)
print(my_dict)  # Output: {'name': 'John', 'age': 30}
print(age)  # Output: 30