How To Use Functions In Python (Python Tutorial #3) 

Below is an outline of this video. 0:41: How to use sample files 1:41: Using comments 2:21: What’s a function? - Example 1 4:57: What’s a function? - Example 2 7:09: A function that takes multiple arguments 7:58: What’s a function? - 2 more examples 10:30: Creating a BMI calculator Also, a few tips: 1. Here is the playlist for this series: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Z1Yd7upQsXY.html 2. Follow along as I explain to make sure you understand everything 3. Ideally, work with a friend so you can help each other when you’re stuck 4. If you want to learn faster than I talk, I’d recommend 1.25x or 1.5x speed :) 5. Check the outline in the comment section below if you want to skip around. 6. Download the sample files here to follow along (they are Jupyter Notebook files): www.csdojo.io/python3 7. To make sure you don’t miss my future tutorial videos, sign up to my newsletter: www.csdojo.io/news 8. Have fun! If anything is unclear, please let me know in a comment.

men i watch every advertisement that comes out to my screen just to be fair by teaching us for free..your awesome men

Hello CS Dojo. I don't know if you are going to read this, but I just passed an Exam in Python because of you! Thank you so much! I spend like 10 hours to watch your awesome lectures :)

I'm skipping school to learn coding from this guy and i gotta say it's worth it.. this dude is way better than all of my teachers

My Professor thinks he's the real shit in Python by creating videos that are 5 hours long just to explain one concept!!!! Now, this is called a real teaching video!!!! short and informative!!!

You are being so helpful. Please continue with this series of python

Def comment1(): print("thanks for teaching me") print("thanks once again") Comment1()

Learned more from you in an hour than 2 weeks of a course. Thanks for taking the time and effort. Much appreciated 🙏🏽

I know this is an old vid I'm commenting on, but you earned an instant sub (well, after 3 videos). Informative, understandable, well presented, quick. Great stuff for a beginner like me!

I started watching these tutorials yesterday and I figured out by myself how to use these functions to create a program to solve the quadratic formula. I know thats probably nothing for coders but I feel really accomplished and if anyone wants to see the code I can send it to you over email. I just feel really accomplished and I wanna share it with someone. This guy is such a good teacher.

Well, out of all of the different, gazillion sites and videos I have paid for and not paid for, you are, in the 61 yr olds opinion, The Best. Knowing what you are doing, and Teaching, are two different skill sets. In my business, just because you have intellect and mental ability, does not mean you will make money. You are doing quite well, starting with a base concept, then giving a practical example, then breaking it down to show how it works. Outstanding job, young man just outstanding. Also, Kudos on your English, bring multilingual myself, it can be a daunting task at times, but you have also done well here. Keep up the good work and I look forward to seeing your future success, by the way, maybe a paid forum might help keep a roof over your head? :) The Ever Kudoing VIPER

I was hoping you would go back and add the "is" before "not overweight', it was driving me crazy haha. Great video :)

I have been following along with Python Crash Course book in my spare time and anytime I get stuck on a problem or don’t quite understand what I’m doing I always come to your channel. This video helped me understand functions a lot more.

I absolutely love your videos. My father inspired me to learn programming, as in the past I’ve learned some but I’ve gathered a lot of laziness towards programming because of a lot of heavy school work. My father encourages me to just read the documentation and learn Python piece by piece, but I find that boring and hard to follow. Your videos keep me going and they are professional and clear. Instead of buying courses on Udemy, I just use your courses and they’re amazing. Thank you so much.

These videos are great. I like the way you organize and outline the tutorial at the beginning.

5 years later and this video is still amazing! You just helped a total noob complete part of the cs50 course with this video. I had no idea how to do mapping with a function. Perfect explanation. Thank you

This is the best Python video so far. Your whole playlist is also extremely helpful. I tried to find other beginners python videos but yours is THE BEST, very well explained and elaborated! Great job!

I thought the overview of functions was excellent. Covering what one can use functions for, quickly and concisely, ( be it mappings and returning calculations. ) as well as using of strings. Much appreciate. I've watched a few online Python vidoes and it's nowhere near as sysynced and easy to understand with useful examples as yours. Keep up the good work.

I am 4 years late to this channel and 43 years late to Programming, but I am enjoying every minute of this series. Thanks YK and the entire CS Dojo team.

Hey YK, I from Canada, Québec, Gatineau and I speak french more than english. I am an absolute beginners on python (leaning how to code). I want to let you know that all your Python tutorial are well explained and I love following your courses cause you take your time to explain step by step and I found this a great quality and skills you have. Keep continue what you do, teaching us, sharing your knowledge and more. Your great energy will bring you where ever you want and you will get what ever you need to accomplish your goals. 👍

Your tutorials are helping me understand the basics of python so quick. I really appreciate everything on your page. Thank you!

Literally the best function video on youtube, thank you!

You are so helpful. I've grown up in a broke family and I don't have any money to buy course for learning Python. Your videos mean a lot to me. Thank you so much Dojo

Just started learning Python as a hobby. I have no programming experience but I am really enjoying it so far. Thanks, man. Your teaching method is really good.

Your tutorials are outstanding. You make learning this so much more easier by looking at your videos and trying them on my end. I'm in my second semester of IT security and Networking and this makes it so much more fun to learn and use Python and I am stupid as far as coding goes. Thank you!

The best part: Running a code without error 😑😑😑

This is the most clear, concise explanation of python I've found, thank you so much for the hard work. :)

I've been self studying using another website where I bought a course on sale, and I have been struggling so much with functions that I even stopped for 2-3 weeks because I just felt so dumb that I couldn't grasp what was being asked of me... this video broke it down so nicely that after so long I'm finally able to grasp what was being said all along. thank you for making this video, it has brought me back to coding!!

I was having trouble grasping these concepts through Codecadamy but you cleared it all up for me. Subscribed. looking forward to checking out your other videos. Thanks.

For those who want to write a quadratic equation, I wrote a code and felt I should share this. So here is the code: def function2(x): a=2 b=3 c=4 return a*(x**2)+b*x+c value_of_my_equation=function2(-2.2) print(value_of_my_equation) Note: you can assign any value for x inside the parentheses beside value_of_my_equation=function2 and any values to a,b,c.

Def convert(x): Return x * 1.6 + " km" Km = convert(5) #5 miles Print Km

Thanks for taking the the time to explain syntax in python tutorials. I find your approach to teaching encouraging.

I have been on app after app and watched tutorial after tutorial, but this is the first video I've seen that explained things clearly and directly using simple terms I could understand. I'm going to be a subscriber of yours forever now! You definitely have a gift for teaching. So many folks in computer science (even if they're brilliant coders) have difficulty explaining their process in a concise way. So thank you; you're a life saver! I'm going to go turn off my adblock now and re-watch this in gratitude :)

Really good series. Thought I'd dip into Python as it's the language used in my nephew's school and he will be taking Computer Science next year. As a retired Science teacher with a lot of experience coding in VB and VBA I've found the presentations very clear and rarely miss a trick (like the importance of the number of leader spaces!). Although I was using PyCharm I now think the Jupyter IDE has the edge for younger students.

YK 😁😍 thank u and keep working over it ,u r an awesome teacher 😂

I am starting to learn coding and this tutorial has helped me a lot , thanks CS Dojo . keep up the good work

Thank you CS Dojo! I have been looking for a channel that I would find someone that speaks clearly and detailed about the subject.

so it's dec 2019, i know i'am late, but you saved me. thank you so much!

Hello YK! Just wanted to say I hardly had any interests in other videos - eg from Coursera as they were usually not straight to the point. But your videos keep me going n the step by step allows me to imprint the steps into my head! I think this is really important for someone who can’t listens to Long lectures and am really thankful to have found your video 🥺

I think what is insane is that these videos were made in 2018 and I'm sitting here on the same program in 2022 and it still looks the same, still works the same, it's just so easy to use; it's incredible.

Thank YK for your useful Python tutorial ✨ A big thank from Vietnam 😄

Finally i got this video. I has been waiting from your last video(if else statement )thank you so much yk ..

After searching on RU-vid for 30 minutes, This video was the only one that really helped me understand how to use the functions. Thx a lot.

I’m so grateful for finding your channel. Thank you !

I have been missing a lot.I just subscribed to your channel yesterday. I'm enjoying it.God bless you

Best functions classes I've ever seen. Congrats!

I was having a tough time understanding Functions from my other teachers since i'm new to .py. In Less than a Minute you've made it seem like ABC. You are a genius!!

I’m Emmanuel from Ghana and I was thinking about how to start my semester Computer programming. I didn’t know what to do but from the fews videos I have been watching from your site . I very motivated to do this course. Thank you soo much for giving me this foundation 🙏🙏

miles = int(input()) def convert(miles): print("KM:") return miles*1.6 km = convert(miles) print(km) Asks to type in miles when run, converts input to KM. Or remove int(input()) and set miles = "amount of miles"

def functie_km(km): return 1.6 * km print("conversis km in mile") a = functie_km(4) print(a)

Thank you so much. i am a new learner of python, the return and function are really confusing for me. This video perfectly explained them for me. Keep up the good work!!!

These are the best videos on how to learn Python. Love these videos bro, thank you.

got inspired from your tutorial!! i'm loving python

def convert(miles): return miles*1.6 km = convert(int(input("Enter miles here: "))) print(str(km) + " km") I decided to take it one step further with the challenge. Allow a user input to convert miles to km, and convert that integer to a string to show the km after the value! Thanks so much for these videos! I am absolutely loving learning python3 (my first programming language). And having passionate people recording tutorials like this really helps more than I could ever put into words!

KJ ! My man! The struggle is real in my fintech bootcamp,(atleast for me) your videos help me understand the concepts sooo much better! Thanks for the awesome teaching material.

This video helped me understand functions for my intro python class! Thank you very much!!!! you explain it better than a textbook does in 400 pages ROFL.

Here is the function: def convert(miles): km = 1.6 * miles print("km: ") print(km)

Hi dojo and thank you for the great tutorial. When you say "a function is a collection of structures". What is a structure? Thank you!

wasn't understanding but later got a hang of it, cs dojo is the best coding tutor thanks

Your tutorial is amazing clear and detailed, really amazing work.

Hey YK love the videos. I really enjoyed the opportunity for a practice problem at the end. I was wondering if in the future you could possibly have more breaks after writing a string? I have two windows open to go between coding and watching and often have to pause to catch up as I am not as fast a typer as you. Thanks and keep the videos coming!

Love from India bro..I learned PHP year ago ..and at that time I was keen to learn python..but didn't happened.. I did 2 months job as PHP developer in a small company..I left..coz i thought it's not that's I want..but after watching ur another videos and that python series..I think I can do this..thanks for uploading the videos ..and keep uploading bro..thank you so much brother.

THANK YOU I am taking a machine learning course this fall and I currently am learning python still and you explain so well i am learning so fast

This was rather complex than i anticipated but actually learnt alot of things. Thx man

You cannot imagine the amount of joy I felt when I converted km to miles😂😂😂😂

Thanks this is great.

If I ever get into engineering and finsihin that faculty bro i wil remember u as my Hero ! I saw others doing tutorials and seeing u Congrats bro u are the one !

Just getting started trying to learn programming and these videos have been very helpful!! Thanks

I did: def convert(miles): return 1.609*miles km=convert(150) print("km =",km) km = 241.35

def convert(miles): print(1.6*miles) miles = int(input("Enter miles :")) convert(miles)

Thank you so much. Your videos are awesome i haven't ever seen such a great tutorial.

CS Dojo you put things into the plain explanation-something that the other tutorials lack

learning so much here, i am going to get a official course on Pyhton (because i have to do some studies or work from the government here in the Netherlands), so i think that is going to be way easier now.. thanks a lot! as soon as i get a job again i am donating some money to you bro!!

I did: def km(x): return (1.6 * x) Miles = km(20) print(miles) 32

this is probably the best video explaining functions that i can find on the internet!

Great tutorial I was watching another full python tutorial but kind of don't get it but your explanation helped me a lot Thank you very much

My solution ^^ def convert(mile): km = mile * 1.60934 return str(mile) + " mile is equal to " + str(km) + " km"

wow i learned more in the first 3 vids than i did taking a four week summer camp python course. thank you so much ! im in eighth grade and this understandable even for beginners.

Very good video, very well explained, and I was able to do the miles to kilometers converter using just your explanation, thank you very much

Bro I feel like I've browsed through a gazillion videos on Functions and only this video helped me. THANKS A TON😭

The wait is over!

It's harder than i thought 😨

Absolutely amazing guidence bro loved it ❤️

def miles(x): return 1.6*x y= miles (45) print ('y=', y, 'km') y= 72.0 km ( I prefer it with unit, hence) Your teaching is really good. Thanks YK!

def convert (miles): print("km:") return 1.6*miles a =convert (4) print(a) km: 6.4 my answer

My miles to kilometer converter: def convert(miles): return 1.6 * miles def temp(x): return 1 * x a = convert(4) x = 4 print(x) print(a) print(x, "miles is", a, "km")

I had to watch this a few times but I think I got it! Thank you!

These are great videos, YK. Thank you.

So love your "Ahhhhh" stuff.

print('hello yk') name = tom print(name) print('here and i want to thank you for the videos you create which are much better than how my teachers teach at school'')

Thank you. This helped me understand the return part of the function much better.

This is incredible and much easier to understand than my online courses! Thank you thank you!!

def convert(mile): km = 1.6 * mile return str(mile)+ " miles is " + str(km) + " kms" a = convert(float(input("input distance in miles: "))) print(a)

Its like waiting for the new episode of your favourite anime, only the difference is that you dont know when the new episode is gonna be dropped.

Thank you! It is better to watch this than the reading I spent hours on. I just needed to understand what it's like to use arguments. It wasn't clear to me in the beginning of my class!

I should have known you a little earlier...You're the best and now I wanna take a course in python, I was here doing it for fun but you've inspired me.

I love ur videos , but there is a question how did u know that after the print("ahhhh ahh 2" ) the function1 has ended

mil = input("Enter miles: ") miles = float(mil) def convert(miles): km = 1.6 * miles return km conversion = convert(miles) print(conversion)

@CS_Dojo Wow you actually explain functions properly unlike the thousands of 30 minute youtube videos that never explain any of this properly.

I love that you can see even a simple function can be performed in all sorts of different ways from the comments here. Here's what I got: def convert_miles_to_km(miles): km = 1.6 * miles print(miles, "miles is equivalent to", km, "kilometers.")