Velofel South Africa built in function called abs which is short for absolute

Velofel ZA to define x and set it to 10 plus 3 times 2. What do you think is the result of this expression? this is a very basic math question that unfortunately a lot of people fail to answer. The answer is 16. Because in math we have this concept called operator precedence which means the order of operations. So the multiplication operator has a higher precendence which means it's applied first which means 3 x 2 is executed first, the result is 6 and then its added to 10, that's why x showed up as 16 after we run this code, let's verify that. So, print x run the program, x is 16. So this is what we call operator precedence, it's just a basic math concept. It's not about python programming language. So all the other programming languages behave the same way, so here's the order, first we have the exponentiation which is the power, like 2 to the power of 3, then we have multiplication or division and finally we have addition or subtraction. This is the order of operations. Let me show you another example. Here I'm going to add the exponentiation operator, so, 2 to the power of 2. Once again, what do you think is the result of this expression? Pause the video and think about it for a few seconds. The answer is 22. Because the exponentiation operator takes precedence, so first 2 to the power of 2 is executed, the result is 4, then 4 is multiplied by 3, that is 12, and finally 12 is added to 10. So x should be 22. So let's run this program and verify this. So I'm going to delete these lines here. Run the program, 

Velofel South Africa (ZA) there you go. X is 22. Now let me bring back these rules here. We can also use parenthesis to change the order of operations so if we have parenthesis we always takes priority. In this case we can add parenthesis around 10 + 3, so this piece of 3 will be executed first, the result is 13, then the exponentiation operator will be executed, so 2 to the power of 2 is 4, and finally 4 is multiplied by 13. Now here is a little exercise for you. I'm going to set x to parenthesis 2 + 3 x 10 minus 3. What is the result of this? Pause the video and think about it for a few seconds. So you learned that parenthesis always overrides the order, so this piece of code is executed first. The result of these 5. Then, between the multiplication and subtraction, you know that multiplication takes precedence. So next, 5 will be multiplied by 10, the result is 50 and finally we have subtraction. So 50 minus 3 will be 47. Let's verify this, print x, run the program there you go, I hope you guessed it right. So this is all bout operator precedence, it's a very important topic and I see it quite often in Python tests. So if you're preparing for a Python test make sure to watch his tutorial one more time. In this tutorial, we're going to look at a few useful functions for working with numbers let's start by defining a variable like x and set it to 2 .9. Now to round this number we can use the built in round function, so we call the round function, give it x, and then print the result. Let's run this program so, we get 3, we have another useful 

Velofel South Africa built in function called abs which is short for absolute, and this is the absolute function we have in math, we give it a value and it always returns the positive representation of this value, even if the value is negative. Here's an example. Let's call the abs function and give it negative 2.9 When we run this program we're gong to see 2.9 on the terminal. So let's go ahead there you go. So absolute always returns a positive number. But technically in Python we have a handful of built in functions for performing mathematical operations, if you want to write a program that involves complex mathematical calculations, you need to import the math module. A module in Python is a separate file with some reusable code. We use these modules to organize our code into different files. As a metaphor think of a super market. When you go to a super market you see different sections for fruits and vegetables, cleaning products, junk food and so on. Each section in the super market is like a module in Python. So in Python we have this math module which contains a bunch of rustable functions for performing mathematical calculations. So, let me show you how to use this module. On the top we type import, math, all in lowercase with this we can import the math module. now math is an object like a string, so we can access it's functions or more accurately it's methods using the dot operator. So if you type math. look these are all the mathematical functions available in this module