Python remove dictionary item

In Python, you can remove items from a dictionary using various methods depending on the situation. Here’s a rundown of the most commonly used methods for removing items:

Using pop()

The pop() method removes the specified key and returns its corresponding value.

Raises a KeyError if the key doesn’t exist unless a default value is provided.

my_dict = {"name": "John", "age": 35, "city": "London"}

# Remove and return value of "age"
age = my_dict.pop("age")
print(age)          # Output: 35
print(my_dict)      # Output: {'name': 'John', 'city': 'London'}

# Using a default value if the key is not found
profession = my_dict.pop("profession", "Not Found")
print(profession)   # Output: Not Found

Using popitem()

The popitem() method removes and returns the last inserted key-value pair as a tuple.

This method raises a KeyError if the dictionary is empty.

my_dict = {"name": "John", "age": 35}

# Remove the last inserted item
last_item = my_dict.popitem()
print(last_item)    # Output: ('age', 35)
print(my_dict)      # Output: {'name': 'John'}

Using del Statement

The del statement can remove a specific key or delete the entire dictionary.

Raises a KeyError if the key doesn’t exist.

my_dict = {"name": "John", "age": 35, "city": "London"}

# Remove a specific key
del my_dict["city"]
print(my_dict)  # Output: {'name': 'John', 'age': 35}

# Delete the entire dictionary
del my_dict
# print(my_dict)  # Raises NameError because my_dict no longer exists

Using clear()

The clear() method removes all items from the dictionary, resulting in an empty dictionary.

my_dict = {"name": "John", "age": 35}
my_dict.clear()
print(my_dict)  # Output: {}

Removing Nested Dictionary Items

If you have nested dictionaries, you can remove items by specifying nested keys.

my_dict = {
    "name": "John",
    "details": {
        "age": 35,
        "city": "London"
    }
}

# Remove a key from the nested dictionary
del my_dict["details"]["city"]
print(my_dict)  # Output: {'name': 'John', 'details': {'age': 35}}