Python: update() method of dictionary

src: datascience dojo

In Python, you can use the update() method to update a dictionary with key-value pairs from another dictionary or an iterable of key-value pairs. The syntax for using the update() method is as follows:

my_dict.update(other_dict)

or

my_dict.update(iterable)

Here, my_dict is the name of the dictionary that you want to update, other_dict is the dictionary from which you want to add key-value pairs, and iterable is an iterable of key-value pairs (e.g. a list of tuples).

When you call the update() method, any key-value pairs in other_dict or iterable that have keys that already exist in my_dict will overwrite the existing values. Any key-value pairs in other_dict or iterable that have keys that do not exist in my_dict will be added to my_dict.

Here’s an example:

# Define a dictionary
my_dict = {"apple": 2, "banana": 3, "orange": 4}

# Print the original dictionary
print("Original dictionary:", my_dict)

# Update the dictionary with key-value pairs from another dictionary
other_dict = {"banana": 5, "grape": 6}
my_dict.update(other_dict)

# Print the modified dictionary
print("Modified dictionary:", my_dict)

# Update the dictionary with key-value pairs from an iterable
iterable = [("kiwi", 2), ("banana", 7)]
my_dict.update(iterable)…