Python update method

Hey! 👋

To do that you can use the .update() method:

# Existing dictionary
dict1 = {'a': 1, 'b': 2}

# New dictionary to add
dict2 = {'c': 3, 'd': 4}

# Using update() to merge
dict1.update(dict2)

print(dict1)

Output:

{'a': 1, 'b': 2, 'c': 3, 'd': 4}

If you’re using Python 3.9 or later, you can also use the | operator:

dict1 = {'a': 1, 'b': 2}
dict2 = {'c': 3, 'd': 4}

# Merging with |
merged_dict = dict1 | dict2

print(merged_dict)

- Bobby

Heya,

In Python, you can add a new dictionary to an existing dictionary by updating it. Here’s how you can do it:

Example:

# Existing dictionary
existing_dict = {
    "name": "Alice",
    "age": 25
}

# New dictionary to add
new_dict = {
    "city": "New York",
    "country": "USA"
}

# Add the new dictionary to the existing one
existing_dict.update(new_dict)

print(existing_dict)

Output:

{'name': 'Alice', 'age': 25, 'city': 'New York', 'country': 'USA'}

Explanation:

• The update() method takes the key-value pairs from new_dict and adds them to existing_dict.
• If a key in new_dict already exists in existing_dict, its value will be overwritten.

Let me know if you need help with any specific use case!

Heya, @d79445eef4054c269ef68e2eb17af3

In general .update() and the | operator (in Python 3.9+) are the most common ways to directly modify and merge dictionaries. These were covered in Bobby’s reply with good examples.

You can also merge dictionaries by passing them to the dict() constructor:

dict1 = {'a': 1, 'b': 2}
dict2 = {'c': 3, 'd': 4}

# Using the dict constructor to merge
merged_dict = dict(dict1, **dict2)

print(merged_dict)

Output:

{'a': 1, 'b': 2, 'c': 3, 'd': 4}

This works similarly to dictionary unpacking and is also compatible with older versions of Python (before Python 3.5).

Regards