Now, let’s see what happens when we try to remove a key that doesn’t exist: # Delete a key that doesn't exist using .pop() You can use a dictionary comprehension to create a new dictionary with that key removed: >>> my_dict = {k: v for k, v in my_dict.items() if k != 'key'} Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness But when the key doesn't exist if key in my_dict: del my_dict[key] is slightly faster than my_dict.pop(key, None). Both are at least three times faster than del in a try/ except statement: >>> timeit.timeit("if 'missing key' in d: del d['missing key']", setup=setup) I want to remove a key from a dictionary if it is present. I currently use this code: if key in my_dict:

The Python .pop()method is a very useful method that allows us to get a dictionary item and remove its key from the dictionary. or in python3, you must use a list comprehension instead: [myDict.pop(x, None) for x in ['a', 'c', 'e']] One case where dict.pop() may be useful is if you want to create a new dictionary with the popped key-value pairs, effectively splitting a dictionary into two in one for-loop. new_dict = {k: v for k in lst if (v:=my_dict.pop(k, 'NULL')) != 'NULL'}The following example removes the master key for the AdventureWorks2022 database. USE AdventureWorks2022; The Drop Key Fireman switch is fitted with a heavy duty DPDT (plunger) double pole micro switch while the Crescent Key Fireman switch is fitted with a heavy duty SPDT (lever) single pole micro switch.

A drop key and crescent key are required to operate their respective Fireman switch and are available separately. Features After removing key: {'Anuradha': 21, 'Haritha': 21, 'Arushi': 22} Method 1: Remove a Key from a Dictionary using the del If we want to be able to safelyremove a key from a dictionary, meaning that no error is returned, we can pass in a default value into our .pop()method. A good default value would be to return None, as it allows us to simply move on. # Delete a key that doesn't exist using .pop()In the next section, you’ll learn how to remove a key from a Python dictionary using a dictionary comprehension. Use a Python Dictionary Comprehension to Remove a Key from a Dictionary The difference between del and pop is that, using pop() method, we can actually store the key's value if needed, like the following: myDict = {'one': 100, 'two': 200, 'three': 300} If we try to delete a key that doesn’t exist, Python will throw a KeyError. Let’s see how this looks: # Delete a key that doesn't exist using del Auxiliary Space: O(1) Method 3: Using items() + dict comprehension to Remove a Key from a Dictionary The auxiliary space required for this code is O(1), as we are only modifying the existing dictionary and not creating any new data structures. Method 2: Remove a Key from a Dictionary using pop()