Add list of values to a key in dictionary Python

In this Python tutorial, we will learn about the Python dictionary append. Also, we will discuss:

• Python dictionary append
• Python append to the lists of each key inside a dictionary
• Convert list to dictionary python
• Add list to dictionary python

Python dictionary append

Python dictionary append is used to add the element in the existing dictionary. In the dictionary, append can be done by list as a list have this feature.

Example:

food = {'Nishant': 'Burger'} food['Nishant'] = [4] food['Nishant'].append['Pizza'] print[food]

After writing the above code [python dictionary append], Ones you will printfood then the output will appear as a {Nishant: [4, pizza]} . Here, the append is used to add the elements in the dictionary. You can refer to the below screenshot for creating a python dictionary append.

You may like Python Concatenate Dictionary.

Python append to lists of each key inside a dictionary

By using + operator we can append the lists of each key inside a dictionary in Python.

Example:

myvalue = {'Akash': [], 'Bharat': []} myvalue['Akash'] += [1,3] myvalue['Bharat'] += [4,6] print[myvalue]

After writing the above code [Python append to the lists of each key inside a dictionary], Ones you will printmyvalue then the output will appear as a {Akash: [1, 3], Bharat: [4, 6]} . Here, the + operator is used to append in the dictionary. You can refer to the below screenshot for creating a python append to the lists of each key inside a dictionary.

Convert list to dictionary python

In Python, to convert a list to dictionary we can use dict.fromkey[] method to convert the given list into dictionary.

Example:

name = ['Tom', 'Mack', 'Jim'] dictionary = dict.fromkeys[name, 'pass'] print[dictionary]

After writing the above code [convert list to dictionary python], Ones you will print dictionary then the output will appear as a {Tom: pass, Mack: pass, Jim: pass} .

Here, dict.fromkeys[] will convert the list into a dictionary with the specified value pass. You can refer to the below screenshot for convert list to dictionary python.

We can also, convert list to dictionary in python by using dictionary comprehension.

Example:

name = ['Tom', 'Mack', 'Jim'] dictionary = {names : 'pass' for names in name} print[dictionary]

After writing the above code [convert list to dictionary python], Ones you will print dictionary then the output will appear as a {Tom: pass, Mack: pass, Jim: pass} .

Here, dictionary comprehension will convert the list into a dictionary, and each keys value will be the same. You can refer to the below screenshot to convert the list to dictionary python.

Read Python string to list

Add list to dictionary python

Now, lets see how to add list to dictionary in python.

The restriction with keys in the python dictionary is only immutable data types can be used as a key. So, we cannot use a dictionary of the list as a key. If we try to do this we will get a TypeEerror.

Example:

my_dict = {[4, 6]: 'Python'} print[my_dict]

After writing the above code, ones we will print my_dict then the error will appear as TypeError: unhashable type: list . You can refer to the below screenshot.

The same can be done with the values in the dictionary. Lets see how we can add a list to the dictionary in python.

Example:

my_dict = {} my_dict["marks"] = [12, 22, 26] print[my_dict]

After writing the above code [add a list to dictionary python], Ones you will print my_dict then the output will appear as a{marks: [12, 22, 26]} .

Here, we can see that the list is added to the dictionary. You can refer to the below screenshot add a list to dictionary python.

This is how, we can convert list to dictionary python.

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In this tutorial, we will discuss how to append an item to Python dictionary. We discussed the Python dictionary append with examples.