Part 2: Dictionaries, Sets

Welcome to the blog !!! Let's begin our journey of learning python by understanding some simple basic concepts.

In this tutorial you’ll learn basics of the Python programming language. The second part covers dictionaries, sets. 

The tutorial uses Python IDLE for Python development environment. If you have not installed Python yet take a look at Install Python 3.X On Windows – Python Installation Guide  💻

Dictionaries

The next important data structure which is supported by Python is a dictionary. In comparison to a list each element within a dictionary is made up of two parts: key and value. To define a list we’re using the following syntax:

This will create the following dictionary with two key-value pairs: 

If we now want to access a specific value from the dictionary we can use the corresponding key for selection. The name of the key is passed into the brackets syntax in the following way:

The result is:

The value of a key within a dictionary can be of any type, e.g. we can use a list as a value. The following example shows how to define a dictionary with one key. The value of that key is a list with three numeric elements:

Accessing the list1 key directly with the following code:

We can also retrieve the list from the dictionary and assign this list at the same time to a new variable which is called list1:

As seen before we can now use the index selector to access items from the list.

Doing the same in just one step is also possible:

As seen with lists before, it’s also possible to include a dictionary within a dictionary. In the following example a dictionary is key1 is defined and the value of this key is set to another dictionary: 

Accessing the inside dictionary is straight forward:

Of course you can access a specific element within the inside dictionary. Here you need to use brackets two times. First to access the value of key1 (which is the inside dictionary) and then access the value of key2 from the inside dictionary:

Sets 

Last but not least, let’s take a look at sets, another data structure which is part of Python. Sets are defined by using curly braces: 

The result set contains only unique values, all duplicates are removed automatically.
Off course, sets can be stored in variables.Adding another element to the set s1 can be done by calling the add method and passing in the new element as a parameter.Now the set looks like the following:

Conclusion 

I hope this tutorial helps you in learning dictionaries and sets in Python

Happy Learning 😀😀

All The Best 👍👍👍.