A drop key and crescent key are required to operate their respective Fireman switch and are available separately. Features The first parameter is the key we want to remove and the second (optional) parameter is the value that should be returned if the key doesn’t exist.

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} In this post, you learned how to safely remove keys from a Python dictionary. You learned how to do this using the .pop()method, the delkeyword, and using a dictionary compreghension. Finally, you learned how to safely remove multiple keys from a Python dictionary. Now that you have an understanding of how Python dictionary comprehensions work, let’s see how you can use them to delete a key from a dictionary: # Delete a Key using a Dictionary Comprehension

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We can see while it’s possible to safely remove a key from a Python dictionary using the delkeyword, it may be better to simply just use the .pop()method. Let’s see how we can pass in a list of different keys to delete, including some that don’t exist: # How to remove multiple keys from a Python dictionary 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() 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 Python also provides the delkeyword to remove a key from a dictionary. Using the delkeyword is a less safe approach, as there is not way to simply provide a default_value, as you can with the .pop()method.

Now that you have an understanding of what dictionaries are, let’s see how we can use Python to remove a key from a dictionary. Use Python .pop() to Delete a Key from a Dictionary 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.

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() Let’s see how we can use the Python dictionary .pop()method to remove a key from our dictionary: # Delete a key using .pop() The key exists in the dictionary, in which case, the key’s value is returned and the key is removed from the dictionary Python makes it easy to remove multiple keys from a dictionary. The safest way of doing this is to loop over a list of keys and use the .pop()method. Because the comprehension uses an ifstatement, we can say that this is a safe method of deleting a key from a Python dictionary. How to Remove Multiple Keys from a Python Dictionary

The Python .pop()method is a very useful method that allows us to get a dictionary item and remove its key from the dictionary. 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 Using the del keyword; it's almost the same approach like you did though - myDict = {'one': 100, 'two': 200, 'three': 300 } We can see that using the .pop()method allows us to safely remove a key from a Python dictionary. Now, let’s see how we can use the delkeyword to remove a key from a dictionary. Use Python del to Remove a Key from a Dictionary The key doesn’t exist and a default value is provided, in which case, the default value is returned.