Remove Key From Javascript Object
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Michael Zippo
04.11.2021
Python’s
pop () method and remove del keyword keys from a dictionary. pop () takes as argument the name of the key you want to remove from the dictionary. The keyword is independent del and refers to a specific key.
Dictionaries are mutable objects. This means that it is possible to modify the dictionary of values. Therefore, you can delete dictionary keys at any time if they are no longer needed.
Suppose you have a Python dictionary that stores information about books sold in a bookstore. You may decide to remove a key that indicates whether the book was in the manager’s recommended list.
Python Remove the key from the dictionary
To remove a key from a Python dictionary, use the pop () method or word - key in "del" method . Both methods work the same in that they remove keys from a dictionary. The pop () method accepts a key name as an argument any "del" accepts a dictionary item after the word del.
In this guide, we discuss how to remove a key from a Python dictionary. We’ll see two examples so you can quickly start removing dictionary keys
Remove key from a Python dictionary:. Pop () Method
pop Python () removes an item from a dictionary.
This method can also be used to remove items from a list at a certain index value. For this guide, we will focus on removing an item from a dictionary. Read our tutorial on Python pop list () Guide for more information on how to remove an item from a list.
The syntax of this method:
The pop () method can accept two parameters:
- the name of the key you want to remove (required ).
- the value that should be returned if a key cannot be found ( optional).
by default, pop () returns the value associated with the key removed from a dictionary .
If you specify only one parameter, the interpreter can throw a Python KeyError . This happens if you try to delete an item in a dictionary that does not exist.
example pop ()
We are creating a program that tracks shoes that are in stock at a local shoe store. Let start by defining a Python array . This table contains a list of shoes that we can work with:
Our shoe list contains three dictionaries. Each dictionary contains four keys: id, name, brand and IN_STOCK. id is a unique identifier for a shoe. name is the name of a shoe. brand is the brand that produces a shoe. in_stock indicates whether a shoe is in stock.
The shoe store has decided to remove the key tag "in_stock" . They want to replace the key with a new value that tracks how many pairs of each shoe are available. To remove the "in_stock" key element from our dictionaries, we will use the pop () method:
the first embedded parameter - in function pop () it is the name of the key we want to remove. Our code returns the second value if the specified key does not exist. By default, the pop () em method > returns the name of the removed key.
In each iteration of our loop, we check if the "in_stock" method the key was removed using a " Python if statement . If "remove_key" has a value other than None, it means our key has been removed.
After a worm deleted the "in_stock" element type our dictionaries, our code prints our new dictionary to the console. Run our code and see what happens:
remove "available" at all of our shoes. Our code shows us that our keys have been removed and prints our updated dictionary to the console
Remove key from a Python dictionary:. Del
The Python del declaration deletes an object. Because the key value pairs in the dictionaries are objects, you can remove them in using the "del" word - key button .
"del" word - key is used to delete an existing key. Throws a KeyError if a key is missing in a dictionary
Let’s examine the syntax of this keyword:.
we use the notation index to retrieve the item from the dictionary that we want to delete. "Key" represents the name of the key whose key value pair we want to remove from the dictionary.
Example
We are going to build a program that removes a key from an individual dictionary. This dictionary contains detailed information about a particular shoe:
The shoe store decided not to discount Jordan shoes. They want to remove the "discount" key from the dictionary. We can do this using the del keyword: print
This code removes the "reduction" key from our list and shows us the new dictionary:
The "reduction" key is no longer in our dictionary