Javascript Dictionary Keys

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You can convert a Python list to a dictionary using a dictionary comprehension method , dict.fromkeys () or zip (). The three methods create a new dictionary. They do not modify the existing list.

Lists and Python dictionaries are two structures used to store data. But what if you want to convert a list to a dictionary? You can do this if you want to assign a unique label to each value you saved. This is possible in a dictionary.

There are techniques and built-in functions that you can use in Python to convert a list to a dictionary. This programming tutorial will discuss, referring to examples, how to convert a list into a dictionary in Python.

Python lists and dictionaries

Lists and dictionaries are examples of Python collections. They allow you to store multiple similar values ‚Äã‚Äãtogether in a single data structure.

The data structure of the list allows you to store data in a specific order. Here is an example of a Python list:

Our list named takeout_prices contains four values.

Dictionaries, on the other hand, are not sorted and cannot store multiple duplicate values .

Here is an example of a Python dictionary :

Dictionaries are useful if you want labels associated with each value. Lists are best if you store similar data, such as price list or names, where each value cannot be labeled.

Python Convert List dictionary

You can convert a Python list in a dictionary using the dict.fromkeys process (), a dictionary comprehension, or the method of closure slide (). the zip () method is useful if you want to merge two lists into a dictionary

Let’s quickly summarize these methods:.

  • dict.fromkeys () - used to create a dictionary to from a list. You can also set a default value for all keys. You cannot set individual values ‚Äã‚Äãfor each item in the Dictionary
  • Understand Dictionary. Create a new dictionary from an existing list. You can specify different values ‚Äã‚Äãfor each key in the dictionary. Dictionary understandings are similar to Introducing Python Lists in the
  • zip () : structure. Convert two or more lists into a list of tuples. You can use the dict () method to convert the list of tuples into a dictionary

We will use each of the above three methods to show how to convert a list to a dictionary

Python list convert Dictionary: .fromkeys dict ()

Suppose we have a list of fruits that we want to turn into a dictionary. The value assigned to each fruit should be Available:

We could create this dictionary using the dict. fromkeys () method . This method accepts a list of keys that you want to turn into a dictionary. Optionally, you can specify a value that you want to assign to each key.

You can specify a single value to be assigned to each key. You can not say that one key must have a value and another key must have another value value t

Let ’s turn our list of fruits into a dictionary:.

Our code returns the objects in this list in a dictionary object:

First , we declare a Python variables called fruits which stores the names of the keys we want to use in our dictionary.

we are using dict.fromkeys () to create a dictionary that uses the key names that we have stored in the fruit array. This method assigns the value of each key as Available. Finally, we print the new dictionary to the console.

If we didn’t specify the Available Value in our code, the default for keys in our dictionary would be None.

convert Python list Dictionary: Understand Dictionary

We can also use a technique called Understand Dictionary to convert a Python list to a dictionary using the same one. The values ‚Äã‚Äã

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A dictionary understanding is similar to a list in the understanding that both methods create a new value of their respective data types. Dictionary understandings use square brackets ({}) while list understanding use square brackets ([])

Either convert our list of fruits into a dictionary using dictionary understanding:.

our code returns:

on the first, we declared a list called fruit that stores the names that we wanted to to move in a dictionary.

Next, we used the comprehension dictionary to cycle through each item in the fruit. We will add an item to our new dictionary for each fruit on our list. The value we assigned to each fruit was Available. Finally, we printed our new dictionary on the console

List Convert Python dictionary: zip ()

In our last example, we converted a single list to a dictionary and assigned a default value for each element in the dictionary. However, it is possible to convert two lists in a dictionary.

To do this we can use the Python zip () function . This feature allows us to merge two lists together. We can use one list as keys for the dictionary and the other as values.

Suppose we have two lists:. One containing a list of fruits and the other containing the price of a single fruit. We want to create a unique dictionary that stores the name of a fruit, as well as its price. We can use the following code to perform this task:

Our code returns:

First , we specified two lists: a fruit list and a price list. So we used the zip () function to merge our two lists. The zip () function returns a list of joined tuples. Since we want a dictionary, we used dict () to convert our tuples into a dictionary

Next, we printed the contents of our new dictionary to the console.

Conclusion

To convert a list to a dictionary using the same values, you should can use the dict.fromkeys () method. To convert two lists to a dictionary, you can use Python zip () function. Understanding Dictionary allows you to create a new dictionary based on the values ‚Äã‚Äãin a list.

In this tutorial, we’ve used examples to show how to use three approaches to convert a list to a dictionary in Python. You are now ready to start converting Python lists to dictionaries like a professional programmer!

Want to learn more about Python? Read our Guide on How to Learn Python This guide contains a list of online courses , books, and learning resources that you can use to develop your coding knowledge in Python.

👻 Read also: what is the best laptop for engineering students?

We hope this article has helped you to resolve the problem. Apart from Javascript Dictionary Keys, check other array Python module-related topics.

Want to excel in Python? See our review of the best Python online courses 2023. If you are interested in Data Science, check also how to learn programming in R.

By the way, this material is also available in other languages:



Xu Gonzalez

Shanghai | 2023-03-22

I was preparing for my coding interview, thanks for clarifying this - Javascript Dictionary Keys in Python is not the simplest one. Will use it in my bachelor thesis

Frank OConnell

Milan | 2023-03-22

I was preparing for my coding interview, thanks for clarifying this - Javascript Dictionary Keys in Python is not the simplest one. Will use it in my bachelor thesis

Dmitry Danburry

Shanghai | 2023-03-22

Simply put and clear. Thank you for sharing. Javascript Dictionary Keys and other issues with types Python module was always my weak point 😁. I just hope that will not emerge anymore

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