How to remove key from dictionary in Python

In this Python tutorial, we will discuss Python dictionary remove. We will also check, how to remove key from a dictionary in Python? Here we will also cover the below examples:

• Python dictionary remove key
• Python dictionary remove duplicate keys
• Python dictionary remove element
• Python dictionary remove last key
• Python dictionary remove key-value pair
• Python dictionary remove empty values
• Python dictionary remove key based on value
• Python dictionary remove none values
• Python dictionary remove duplicate values
• Python dictionary remove value

Python dictionary remove

• Let us see how to remove a dictionary in Python.
• In Python, the clear() method is used to delete a dictionary Python.
• This method removes all the keys values pairs that are available in the dictionary and always returns a none value or empty dictionary.

Syntax:

Here is the Syntax of the clear() method

dict.clear()

Example:

Let’s take an example and check how to remove a dictionary in Python

my_dict = {'john':3,'George':6,'Smith':9,'Brown':6}
b = dict.clear(my_dict)
print("Remove dictionary:",b)

Here is the example of the following given code

Read: Python dictionary length

Python dictionary remove key

• Here we can see how to remove a key from dictionary in Python.
• To remove a key in a dictionary there are various method to perform this task.
• The following ways to remove a key from dictionary are
  • By using pop() method
  • By using del keyword
  • By using dict comprehension and item() method

Examples:

Let’s take an example and check how to remove a key from a dictionary by using the pop() method.

In Python, the pop() method can be used to remove a key and the value from a dictionary. This method can be used to remove an item from a particular index value. The pop() method takes only one parameter which is the name of the key which we want to remove from a dictionary.

Code:

my_dict = {'Australia':250,'Germany':650,'Japan':900,'England':500}
rem_key = my_dict.pop('Germany')

print("Remove Key from dictionary:",rem_key)
print(my_dict)

Here is the Screenshot of the following given code

Read: Python Dictionary index

By using del keyword to remove a key from dictionary

• In python del keyword can be used to delete an object or item that is available in the dictionary.
• This method raises a Key-error if key is not available in a dictionary.

Code:

my_dict = {'U.S.A':450,'China':320,'Japan':680,'Polland':500}
del my_dict['Japan']


print("Remove a key from dictionary:",my_dict)

Here is the execution of the following given code

Read: Python dictionary initialize

By using dict comprehension and item() method

• In Python, the items() and dict comprehension can also help the user to remove a key from a dictionary.
• The items() method takes no parameters and always returns an items to store in a list.
• Dict comprehension is basically used for creating a dictionary by including all the key-value pairs.

Let’s take an example and check how to remove a key from the dictionary by using dict comprehension and items() method

to_dict = {"Mangoes" : 40, "Grapes" :29, "Oranges" : 39, "Apple" : 49}
  

new_key = {key:val for key, val in to_dict.items() if key != 'Grapes'}

print ("Remove after key is :",(new_key))

Here is the Screenshot of the following given code

Python dictionary remove dupliacte keys

• Here we can see how to remove duplicate keys from a dictionary in Python.
• By using the loop and items() method we can easily remove a duplicate item from a dictionary.
• In this example first, we will initialize a dictionary and remove duplicate keys in a dictionary using loops, this method will remove any duplicate values from our dictionary.

Example:

Let’s take an example and check how to remove duplicate keys from a dictionary

my_dictionary = { 'John' : 20, 'George' : 45, 'james' : 10, 'George' : 60, 'potter' : 70}
  
new_key = []
output = dict()
for new_k, new_val in my_dictionary.items():
    if new_val not in new_key:
        new_key.append(new_val)
        output[new_k] = new_val
  
print("Remove duplicate key is:",output)

Here is the Screenshot of the following given code

This is how to remove duplicate keys from a dictionary in Python.

Also Read: Python dictionary filter

Python dictionary remove element

• Let us see how to remove an element from a dictionary.
• By using dict.keys method and del keyword we can easily remove an element from a dictionary.
• The dict.keys() method always returns an item that displays a list of the keys of the dictionary. Now create a for loop to iterate the items from the dictionary.
• In this example create a variable “selected_key” and assign them a key element which we have to remove from a dictionary. Use the del keyword and check the indexing value and then call the break statement.

Example:

Let’s take an example and check how to remove an element from a dictionary

my_dict = {"Italian": 9, "Chinese" : 12, "Mexican": 7}

select_key = "Chinese"
new_key ="Italian"
for n_key in my_dict.keys():
  if n_key == select_key:
    del my_dict[n_key]
    break
for n_key in my_dict.keys():
  if n_key == new_key:
    del my_dict[n_key]
    break
print("Remove element from dictionary",my_dict)

Here is the Screenshot of the following given code

This is how to remove an element from a dictionary in Python.

Another example to check how to delete an element from a dictionary

In this example, we can easily use the method pop() to remove an element from a dictionary. First, we will create an employee list and store two dictionaries. Each dictionary contains three keys. Now we have to remove an element from a dictionary by using the pop() method.

Example:

employee_info = { "emp_id": 234, "emp_name": "Adam", "emp_address": "England" }

new_key = employee_info.pop("emp_address")
print(new_key)
print("Remove element from dictionary",employee_info)

Here is the Screenshot of the following given code

Read: Python dictionary values to list

Python dictionary remove last key

• Let us see how to remove the last key from a dictionary in Python.
• In this example we can easily use items() and for loop method to remove the last key from the dictionary.

Example:

Let’s take an example and check how to remove the last key from the dictionary

my_dict = {"Steve": 234,"Mark": 134,"Robert": 278,"Chris": 43}
remove_key = 'Chris' # last key
to_dictionary = {}
for new_key, new_value in my_dict.items():
    if new_key is not remove_key:
        to_dictionary[new_key] = new_value
my_dict = to_dictionary
print(" Remove last key from dictionary:",my_dict)

Here is the Screenshot of the following given code

Another example to check how to remove a last key from the dictionary

• In this example, we can easily use the pop.item() method to remove a last key from the dictionary.

Example:

new_dictionary = {"Andrew": 120,"Hayden": 140,"Mathew": 210,"Gilchrisht": 174}
rem_key = new_dictionary.popitem()

print("remove last key:",rem_key) # remove last key
print(new_dictionary)

Here is the Screenshot of the following given code

Read: Python Dictionary update 

Python dictionary remove key-value pair

• Here we can see how to remove the key-value pair from a Python dictionary.
• By using del keyword we can remove the key-value pair from a dictionary.

Example:

Let’s take an example and check how to remove the key-value pair from a dictionary

my_dict = {"a": 120,"b": 30,"c": 150,"d": 143}
del my_dict["b"]

print("remove key-value pair:",my_dict)

Here is the Screenshot of the following given code

Another example to check how to remove the key-value pairs from the dictionary

• By using the popitem() method we can easily remove the key-value pairs from the dictionary.
• In python popitem() method does not take any argument. This method is used to remove a random element from a dictionary and always returns its value.

Syntax:

Here is the Syntax of popitem() method

dict.popitem()

Example:

my_dict = {"m": 60,"n": 40,"o": 10,"p": 14}
new_item = my_dict.popitem()

print("remove key-value pair:",new_item)
print(my_dict)

Here is the Screenshot of the following given code

This is how to remove key-value pairs from the dictionary in Python.

Read: Python Concatenate Dictionary

Python dictionary remove empty values

• Let us see how to remove empty values from a dictionary in Python.
• By using list comprehension method we can easily perform this task.

Example:

to_dict = [{"u": 10,"v": 50,"p": '',"z":''}]
output = [element for element in ({new_key: new_val for new_key, new_val in sub.items() if new_val} for sub in to_dict) if element]
                                         

print("Remove empty values: ",output)

In the above example first, we will initialize a list and remove empty values by using list comprehension.

Here is the Screenshot of the following given code

Python dictionary remove key based on value

• Here we can see how to remove a value based on key from a Python dictionary.
• By using dictionary comprehension and items() method we can easily remove key based on value.

Example:

my_dict = {"u" : 12, "d" :16, "e" : 19, "f" : 15}
  

rem_key = {n_key:n_val for n_key, n_val in my_dict.items() if n_val != 19} # selected value

print ("Remove after key based on value is :",(rem_key))

Here is the Screenshot of the following given code

This is how to remove a key based on the value

Also Read: Python dictionary append

Python dictionary remove none values

• Let us see how to remove none values from dictionary in Python.
• By using for loop and list comprehension method we can easily remove none values from dictionary.
• In this example first we will initialize a list and use list comprehension method to check if the key-value pair is none or not in a dictionary

Example:

Let’s take an example and check how to remove none values from a dictionary

to_dict = {'t': 40, 's': 30,'d':None,'n':None}

output = []
for value in to_dict:
    if to_dict[value] is not None :
        output.append(value)
  
print(output)

Here is the Screenshot of the following given code

Python dictionary remove duplicate values

• To remove duplicate values from a Python dictionary we can easily use dictionary comprehension method.

Example:

Let’s take an example and check how to remove duplicate values from a dictionary

my_dictionary = {'Australia': 20, 'Switzerland': 30,'Newzeland':30,'Moscow':70}


new_element = {new_val : new_key for new_key, new_val in my_dictionary.items()}
new_output = {new_val : new_key for new_key, new_val in new_element.items()}
print(new_output)

Here is the Screenshot of the following given code

Python dictionary remove value

• Let us see how to remove a value from the dictionary in Python.
• By using the dict comprehension and items() method we can easily remove value from the dictionary.
• The items() method always returns an object of the dictionary. The object is a collection of key-value tuples. The items() method does not take any arguments.
• Dict comprehension is basically used for creating a dictionary by including all the key-value pairs.

Example:

Let’s take an example and check how to remove a value from the dictionary

dictionary = {"a" : 40, "z" :29, "c" : 39, "v" : 49}
  

rem_value = {new_key:new_val for new_key, new_val in dictionary.items() if new_val != 49}

print ("Remove after value is :",(rem_value))

Here is the Screenshot of the following given code

This is how to remove a value from the dictionary in Python

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In this Python tutorial, we will discuss Python dictionary remove. Here we will also cover the below examples:

• Python dictionary remove key
• Python dictionary remove duplicate keys
• Python dictionary remove element
• Python dictionary remove last key
• Python dictionary remove key-value pair
• Python dictionary remove empty values
• Python dictionary remove key based on value
• Python dictionary remove duplicate values
• Python dictionary remove none values
• Python dictionary remove value