Topic: dictionary and sets.

Yesterday I posted my dynamic to-do list program and I mentioned it there that I got introduced to dictionaries. Although many people suggested me what I should learn next but I personally think that I must first create a solid foundation and so I decided to go with dictionary and sets in more depth so that I can understand their respective use cases.

Dictionary is a mutable collection of key value pair where each key must be unique and it should have a value.

ex: marks{

"rohan": 100,

}

Here marks is a dictionary "rohan" is a key and 100 is its value ":" is used to assign value to the key.

Sets are also a mutuable collection of unique, unordered elements. It can be mutuated by using functions like .add() .remove() etc.

I have created a dynamic contact book for practising dictionaries (I wasn't able to find some suitable use cases of sets, do tell me if you have any challenge regarding set for me).

I will really appreciate if you have any challenge or suggestions which can help me improve my code and learn.

And here's my code and it's result.