Python add new item to dictionary

Question

I want to add an item to an existing dictionary in python. For example, this is my dictionary:

default_data = {

            'item1': 1,

            'item2': 2,

}

I want to add new item such that:

default_data = default_data + {'item3':3}

How to achieve this?

Answer 1

You can do it simply by setting the key 'item3' to value 3 like this:

default_data["item3"] = 3

or if you want to insert multiple items at one you can do it like this:

default_data.update({"item3": 3, "item4": 4})

Answer 2

Try using the code given below:

default_data['item3'] = 3

Easy as py, Or else you can use the below code:

default_data.update({'item3': 3})

And it's applicable for inserting multiple items at once.

Answer 3

To add new items to dictionary you can use the below-mentioned code:-

>>> class Dict(dict): 

... def __add__(self, other):

... copy = self.copy() 

... copy.update(other) 

... return copy 

... def __radd__(self, other):

... copy = other.copy()

... copy.update(self)

... return copy 

... 

>>> default_data = Dict({'item1': 1, 'item2': 2}) 

>>> default_data + {'item3': 3} 

{'item2': 2, 'item3': 3, 'item1': 1} 

>>> {'test1': 1} + Dict(test2=2) 

{'test1': 1, 'test2': 2}