In the image you can see i am starting with a list with three element, but if you look at the output its outputting 4, this is because i am using insert, when you use insert you need to define where you want the element to go and then the value to be placed in there, its a very simple concept to do and understand.Next is count, this is as you would think, so in the () you enter a value that is in the list and it will output the count of all values, it wont add the elements, it just counts so you can see how many are there. Lastly we have clear which is self explanatory, it just clears the list

Learning Python: Inserting to a list plus clearing

Learning Python

Python: Part Fifteen

Funcational Programming is a declarative way of programming.

What Is Functional Programming

Remember how we assign different values to a variable through out the program? How we use setters in classes to modify the value of class variables? That is not allowed in FP. A variable once set remains unchanged. Sort of like, making all variables <code>final.</code>We usually think of variables as vessels that hold the values. The vessel can hold different values at different times. But in FP, variables are just another name for their values. Like, PI is always 3.14..Ever imagined a different value for PI? No? In the same way, every x, y in your program can now have a single value.

Immutability

If a function returns same value for the same argument every time, then the function is pure. That generally means that, the function cannot use any state values that could potentially change.

Functional Purity

In OOP we treat data and functions separately. In FP, they are all the same. We can create an array of functions, pass a function as argument, return a function from a method.

First Class Function

Let's say there is a function that takes three arguments. Usually, we need to be aware of all three values to call this function, right? In partial application, the three arguments are provided at different times. I could not find a decent blog that explains this well. <a href="https://en.wikipedia.org/wiki/Partial_application">Here </a>is the wikipedia page.

Partial Application

Recursion is when a function calls itself and an end condition exists in the function to stop the method call. We could talk about this in depth another day. For now, <a href="https://dzone.com/articles/functional-programming-recursion">here </a>is a good explanation.

Recursion

This is a method where we take simple functions and combine them into a more complex function. Let's say we have two methods <code>f(x) = x * 2 //(timesTwo) </code>and <code>f(x) = x - 1 // (minusOne) </code>. And we want to compute <code>f(x) = 2x -1 </code>. You call the <code>timesTwo </code>function first. With the output of <code>timesTwo </code>, you call the <code>minusOne </code>function. How would you code this? The requirement here is that the next function takes as argument the same type that the previous function returns.

Composition

I completed a course on Functional Programming on LinkedIn Learning and here is what I want to remember from it. What is Functional Programming? Funcational…

Functional Programming

In this tutorial we will implement a Python based FastAPI with PostgreSQL CRUD. We will focus on implementing Asynchronous REST Endpoints with the help of Python based module databases that gives simple asyncio support for a range of databases including PostgreSQL. Read in detail <a href="https://www.tutlinks.com/fastapi-with-postgresql-crud-async/">here</a>

Implementing Async REST APIs in FastAPI with PostgreSQL CRUD - TutLinks

Helps you build a CRUD REST API using FastAPI

In this tutorial we will implement a Python based FastAPI with PostgreSQL CRUD. We will focus on implementing Asynchronous REST Endpoints with databases asyncio

In todays image we can see that i am using two new keywords, remove and pop.The best way to think about it is that pop "pop()" removes the last element from the list, or you could put a index value, so in this case in the image i have put 1, this is the second element because python starts with 0. Next we have remove and this wants to know the value you want to remove, so in this case i entered a string, and it removed it from the list.If you was to put "name = user.remove("sam")" it would take out the value from the list and put into the variable to be used later.

Learning Python: Removing from a list

learning is the best this we can do to better our selves, teach each other

Python: Part Fourteen

So last time was about lists, and how to add elements to the list manually, but now lets look at adding a user but the user enters the info.I have made a empty list, in this case i have done it very simply and asked the user and put that into a variable.Once this is done then to add it to the list all we need to do is reference the list so in this case "user" and then followed by a full stop, from here you should see a list of different functions you could use, but in this case we are looking at the "Append". This will add the data in the variable to the list. print the list a have a look