Common Dictionary Methods
Python dictionaries have several built-in methods that allow you to manipulate them efficiently.
get() Method
Returns the value of the specified key.
Example: Using get()
# Using get()
person = {"name": "Praveen", "age": 24}
age = person.get("age")
print("Age:", age)Age: 24
keys() Method
Returns a view object containing the dictionary's keys.
values() Method
Returns a view object containing the dictionary's values.
items() Method
Returns a view object containing the dictionary's key-value pairs.
update() Method
Updates the dictionary with the specified key-value pairs.
pop() Method
Removes the element with the specified key.
Example: Using pop()
# Using pop()
person = {"name": "Williams", "age": 29}
age = person.pop("age")
print("Popped Age:", age)
print("Person Dictionary:", person)Popped Age: 29
Person Dictionary: {'name': 'Williams'}
popitem() Method
Removes the last inserted key-value pair.
clear() Method
Removes all the elements from the dictionary.
copy() Method
Returns a shallow copy of the dictionary.
fromkeys() Method
Creates a new dictionary from the given sequence of keys and a value.
Example: Using fromkeys()
# Using fromkeys()
keys = ['name', 'age', 'city']
default_value = None
new_dict = dict.fromkeys(keys, default_value)
print("New Dictionary:", new_dict)New Dictionary: {'name': None, 'age': None, 'city': None}
setdefault() Method
Returns the value of a key. If the key does not exist, inserts the key with the specified value.
Example: Using setdefault()
# Using setdefault()
person = {"name": "John"}
age = person.setdefault("age", 26)
print("Age:", age)
print("Person Dictionary:", person)Age: 26
Person Dictionary: {'name': 'John', 'age': 26}
Explanation: These methods provide various ways to interact with and manipulate dictionaries, allowing for efficient data management.