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Hello everybody.

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And welcome back to the Python basics.

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Now right now we cover all of the things but we still do have a few things left such as functions in

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this video.

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So right now we will I will show you how you can create simple functions in order to automate some of

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the processes.

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Now you can create functions for basically anything such as printing something adding something calculating

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something or basically anything you want.

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Now right now we will use some of the simple functions but let's actually try to implement the function

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on a program that we already coded before.

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So let me just find that if I just type your less Python Wanda by let me find it.

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It is not that one.

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It is this one.

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So let's actually use a function which will actually automate this process.

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So now I turn to the PI.

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Right now we can actually put this in the function and we can call that function with a simple line.

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So first of all how do we actually declare a function.

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You declare a function with basically three letters which is death and then the name of the function

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itself.

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So what we want to do is after this rescue that so we can declare a function right here.

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Since this part of the code will be going in our function.

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So every time we want to use it we only specify the name of the function and then the number in brackets

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and we will be able to perform all of this with just that.

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So let's start off by actually declaring over function.

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So we as I said we need to take a death which declares a function and then right now we want to type

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the name of our function.

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So that would be the you can name it basically anything you want let's name it the activity or something

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like that.

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It doesn't even matter as we can see the name of the function cell is different colors.

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So that's also how you know that you are correct the correct me using syntax and in the brackets you

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can put something you don't have to.

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Basically no function we must put something so this function can have a use of it and we will put basically

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any number.

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Now you might be asking when needed to declare any number anywhere.

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Well this is this is something that you will provide to this function later on you do not need to declare

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this.

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This is not any variable.

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What you will declare is this variable light right here afterwards.

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So it will basically use this variable throughout the function itself.

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So if you just type your any number you will need to change all of this as well.

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So any number and this to any number and also the next thing you want to do is that all of this one

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time.

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So everything we typed just tab it so it belongs to the function.

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And right now we basically finished creating our own function.

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So what this will do is once we call it with any number in the brackets it will perform the this task

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right here for any number.

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So we asked for no input.

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And right now in order to call that function we call it like this.

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So activity loops which is the name of our function and then we specify the number we want to perform

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this task on which in our case is the user input number which is under the label number.

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So we just specify here number.

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And that's basically it.

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This is the entire function Britain for a certain number.

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So let's actually recap what this will do.

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So we named it we declared it.

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We also put something in it.

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So it only takes one argument which is any number in our case you could have named it anything basically

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but you would have to change all of this as well to match the name of this in the brackets.

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So after that we actually just use the code from the previous video.

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So this is just to check if number zero positive or negative.

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And basically after that we called that function on our user input number.

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So let's see how that will work.

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So control 0 2 safe control extra exits and let's run by tend to once again enter into number three

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given number is positive.

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So enter number zero given number zero and minus five or minus three given number is negative.

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So you can see that this function does work.

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We just called it with this and you can call it basically anything you want you can call it right here.

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Activity basically of three activity or minus three loops and activity of zero.

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And let's delete this so it doesn't asks for.

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For this we can also put this under a hash that is also a useful thing to know.

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So basically a hashtag will perform or will actually not be read as a code.

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The everything that comes after the hashtag equal put it as a comment.

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So everything after this will not be executed by Python.

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So right now we only have a function and I basically just written here three numbers that will perform

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all of this on them.

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So first of all really positive.

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And the second one will be negative.

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And the third one will be zero.

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So let's actually see how that works.

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So control 0 to save control x2 exits and then we run the program once again as we can see given number

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is positive given number is negative gearing number zero.

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Let me just add the end right here.

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Since it doesn't put it.

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So given let's say this once again so that is simple use of a function.

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Now let's actually make another function that will actually do something with the string.

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So we did something with numbers let's actually do something that will include strings as well.

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So let's now know Python 5 the pipe.

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Let's add that back to our Python folder.

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Now right now let's first of all take an input of a string so we want to type string.

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We will put it in a variable we will name its like that so raw input in order to take the input from

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a user.

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And basically type any string you want.

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And right now basically the user will get this input to specify anything it wants and we know right

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now let's see what we can do with it.

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Let's actually try to reverse that sentence or any string that the user inputs.

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So let's do that.

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We will be reversing everything a user input so we make a function for that of course we will not be

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doing it without the function.

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This is a medium for functions defined and we can call it anything we want so let's call it reverse

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string.

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So it's long name but it doesn't matter.

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So let's call it reverse underscore string so it looks a little bit better.

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And then here we specify more we name it anything also and a string as in the previous video we can

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name it anything we want right here.

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But make sure that this and a string that you use in the rest of your function call so we tab right

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now in order to perform the next code for our function.

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And the only thing we want to do is use the simple python print statement so print and a string then

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open these brackets then two times type these two dots and then minus one.

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This right here will basically reverse anything they type it will print us everything in reverse order.

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So this is the entire function.

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Basically just with this simple print statement we can do that and all we have to do right now is called

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the reverse string reverse underscore string and we call it on our user input string so which is called

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string

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so we control all enter.

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Now basically this might be a little bit confusing to you if you are an ultimate beginner but make sure

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to actually go around and check some other things as well.

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For Python since people really make you better understand what we will be doing later on.

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So this is just something basic that you need to know in order to able to be able to follow later on

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what we will be doing.

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So just wanted to say that.

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So let's call this right now.

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We sent it.

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We LSC in order to make our Python five an executable and right now we run Python five.

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It will say type anything we want.

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We type here for example I know Bert and we can see that it actually prints off the reverse order of

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the word of the word.

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Let's try something else so hello world.

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We can see it reversed all of that.

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So even two words can work.

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So hello world light here and that is basically our simple use of a function that actually does something

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with the strings so let's actually do another function that will include lists for example.

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So let's use the same file so we will just delete our previous code right here.

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So we don't create a new file.

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This doesn't really matter.

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This is a simple code anyway.

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Now let's actually first of all create a list.

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So numbers number lists equals and then we specify one come up to a common treatment for common five.

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So this is our list containing these five numbers.

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Now let's actually create a function that will for example print.

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If the number is odd or even

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or even better let's actually try to write a function that will print the number of odd numbers in the

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list and the number of even numbers in the list.

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So let's call it deaths for example or even on underscore even doesn't even matter.

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And what we want to specify right here is any list.

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So we'll just call it lists since it doesn't really matter.

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You can call the analyst you want but make sure to use this name in the brackets in the rest of the

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day or in the rest of the function code.

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We specified two local variables which is count even numbers and we said that two to zero.

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And also count odd numbers.

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And we will set that to zero as well.

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So we said basically two variables.

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One of them will count our even numbers.

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And one of them will count our old numbers.

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So right now let us for first of first time use the for loop in our function.

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So for Tau I for example in list.

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So for I in the list that we specified in our function.

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Basically if and then we open brackets if the AI module the two equals equals zero then our number is

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basically even.

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So we want to add one to the count even number since we found one even number so we can do that with

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count even numbers plus equals 1.

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This is basically the shorter version of equals counting the numbers plus 1.

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So we can just type your plus equals 1 which will just add one to the previous value of even numbers

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so and then we want else.

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So else pops you can see right here I forgot to specify two dots.

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So this code will get an error.

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So right now we want one what we want to specify is else and we can just do the same with odd numbers

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so count odd numbers as equals 1.

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So if the number isn't even equal add one to the odd numbers.

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If the number isn't even it will add 1 to the even numbers.

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So we can see how many even and how many odd numbers there are.

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And we can do that with basically a simple print statement at the end.

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So this will finish the loop for every number in the list.

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And right now we can print for example the number or even numbers is that we specified the percent D

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because the quotes and then percent count even numbers.

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And then we also do the same so print the number looks a number of numbers is percent D and then percent

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count odd numbers.

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So it is rather simple as we can see right here it will just print out the number of even a number of

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our numbers and all we have to do right now is call the function on our already pre specified list right

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here.

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So odd even out of nonetheless.

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So number on this call list and let's see how this will work.

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So percent x we already have it specified as an executable.

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And right now we just type your python five.

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The PI.

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So the number of even numbers is two and the number of odd numbers is three which is correct.

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So that would be about it for the simple use of functions.

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This is something very useful and this something that we will use.

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So make sure to fully understand this look at some other of this if you want to and make sure to actually

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understand everything that we do in this python crash course it will be reported later on.

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So that be about it for this Collier tutorial.

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I will see you in the next one and take care.

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Bye.