An Introduction to Software Design - With Python
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- čas přidán 1. 04. 2020
- This video is designed to introduce you to software design principles in python. This software design tutorial is aimed towards beginner python programmers looking to step up their knowledge and advance to the next level. This is merely an introduction and meant to get you thinking about a few principles and patterns that you can apply to write better, cleaner code.
📚 The reference for this video is the book: "Practices of the Python Pro" by Dane Hillard.
🔗 Get it here: www.manning.com/books/practic...
I've started reading it and must say I'm impressed. It teaches software design in python and covers design principles and design patterns not covered in this video.
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Hey Tim, author of Practices of the Python Pro here!
Thanks so much for distilling a number of concepts in the book to these tangible examples. Reading about them is one thing, but watching code change in real time often helps folks really see the value.
Well done as always, and thanks for the shout out!
Hey Dane! No problem, looking forward to diving deeper into the book. Has been a great read so far :)
Sorry, check the IBM Documentation on Software Application Architecture
Pretty old and independ of any language. Still the standard of the trade.
@@MBrieger Do you have a link to that Book/ Document?
@@MrKurdishFreak www.amazon.com.au/Practices-Python-Pro-Dane-Hillard/dp/1617296082/ref=sr_1_1?keywords=Practices+of+the+Python+Pro&qid=1589844408&sr=8-1
Hey Dane, no kindle version on amazon, is that weird?
You making videos for people who have done the circuit of "beginner tutorials" is a godsend. I can make the loops, I understand the syntax but I really think it's so nice to see what it is I need to do to get a bigger picture. Thank you for making these, I'm definitely following
I second that!
so true!
I like this dude
he helps you get out of tutorial hell
I'm an Italian computer science student and I swear that it doesn't matter if I know topics you're talking about, I'll watch your videos 'cause I'm just amazed about the way you explain concepts. Keep up the great work Tim, you're a programming beast! 💪🏽
Finally I've found someone who can teach, without getting sidetracked or losing my attention by just going to slow. It's so much easier to follow along when you keep the momentum going. Keep up the good work!
You've said in the first minute everything with what I'm struggle with
Thanks for your time to make such great educational videos!
Your examples are so helpful, they really help me realizing in which cases that could be used. Thanks a lot for your work and stay safe
0:00 Introduction
2:19 Why software design is important :flexibility&scalability (if the input or problem is changed)
8:30 use the code multiple times and change it in the future: split the code in classes/methods/function +more make readable and debug-able
18:26 make modules( separate files) to be cohesive, import functions from other modules
28:00 packages
33:00 conclusion
I haven't seen the whole video, and I'm not a Python developer. However, one improvement you can do with your guessing game is to separate your UI from your guessing game logic. If I'm not mistaken, input and print are console operations. As of right now, your guessing game is coupled to a console app. If you separate the UI and put the logic in its own module, you can reuse it for other apps such as desktop, console, and web. Anyway, great content!
So far this has to be the best channel I've found for learning to code. I'm extremely new to this but having watched a handful of your earlier videos I've been able to keep up with your explanations. I can't write code like this but I understand the concept.
I find it's a rarity these days to be able to watch an entire video from someone on CZcams.. You have a talent for keeping the content engaging and moving at a pace that's just right!
Thanks for taking the time to make tutorials like this! I'd love to see more like this - there's so many tutorials on what you "can" do in Python but so few like this on good practices and organization.
The guess game class was like a poet! Beautiful and full of meaning! I'm not a very good programmer, but as I move forward and learn more I appreciate the beauty of good code more and more.
you’re killing it Tim hope your career is taking off
Thank you! I love all that is related to design, I've been reading the "Head first design and oop" book and your video is really helpful to see all that stuff implemented!
i have 59 and my prof have 19 year old. Thank you for this experience...
CodyLLC I’m assuming English isn’t the first language here. Some languages say they have certain ages instead of is a certain age.
He said that his teacher (Tim) is 19 years old while he is 59.
Deep
@@The4lexO yeh
What...?
Thanks man thats what I was looking for. Your tutorials are easy to understand.
Thank you for this. Principle of change and avoiding hard coding explained really well. So helpful.
This is exactly the video I needed to watch tonight. Lots of great information here. Thank you!
You are so good in what you do! Keep it up man, this really helps
This video is the perfect leg-up from basics. Tha is fir making this, Tim! I'll be checking out everything in this series!
Dude. This couldn't have come at a better time. Thanks Tim
young buck is the best OOP teacher I've seen period
agree!
The idea of a package have never really been explained this good before.
WoW your tutorials are like fast reading a 200 page book. In start it was hard for me to follow what you are saying but now that I am an intermediate programmer and doing Data Analysis using Python and SQL. I can quickly grasp what you are saying. You kind of reminds of Sheldon Cooper from TV Series Big Bang Theory.
Great timing. We needed this during the lockdown.
Thanks.
Thanks Tim, this video is exactly what I needed in my current learning process. Feel free to make more of those in the future it is just awesome! Keep up the good work!!! Cheers
good advice as always. love the perfect flow of the video, you planned it really well!
This is EXACTLY the point I am right now.
Thank for the video!!!
Big thank again. Now every time when i needed to learn a new thing about Python, I look for lessons made my Tim only.........
Hey I think it's time i introduce myself:
My name is Victor and I'm sixteen
Since I was thirteen I have been learning python from you although not full-time but your tutorial s have taken me a long way and
I want to take on computer science in a year. Thank you Tim you r my role model
It's awesome you're getting into computer science at such a young age. Once you learn one language it only gets easier. Basically all programming languages reuse the same concepts, just different syntax and implementation. You'll do great. Good luck.
Damn this channel is superb! I never thought to find something this good for free! I found this channel by chance, actually youtube algorithms showed it to me and I feel like someone who found a gold coin in the street!
You are specially good. Beside presenting high quality content, introducing us to resources and books is a very good thing. Most of youtubers don't do this.
Really out of all python channels out there you are the best!!! I really like your explanation style. if you get it you can go at 1.5x or something and you can get it or if you don't get it go at normal speed and even then understand it. Thanks for the tutorials!!!
Im improving my English and my programming skills with you. Thanks.
Dear Tim, we really appreciate the content you created for us...you really help us a lot and we appreciate that....thank you very much again!!!
loved this vid, great info! would like more level 2 tutorials!
Very good Tim, a follow on that I would like to see would cover data structures.
Coming from C, I miss when working in Python,
Of course dict, list, tuple, string etc are understandable each on their own,
but I do struggle a bit on organizing at the appropriate level.
I am learning of course but a lecture which joins concepts from C --> Python would help me.
Thanks
Man.. this is gold!! More videos on this topic please!!
I've already jumped into the database section but never have I organized my code.. Thank you for this Tim!
Hi, I really love your videos. I am 15. Your python tutorials are amazing. You are my inspiration for my youtube channel
Great video, some of the best explanations of great practice in half an hour.
18:51 I found that to be especially important in programming! Would it be possible for you to make a video about it maybe? For example, I suck at doing flowcharts and it'd be nice to see what an optimal approach would look like!
Thanks Tim, very nice video :) it’s very useful as we move from beginner to intermediate level in python programming. I would love if you made a video about ‘the pythonic’ way of programming in Python. I read this around a lot, and I have a basic understanding of what it means, but I am sure you could provide more insight on how to be more ‘pythonic’.
Excellent video Tim, thank you.
quick suggestion,you can make this a series where you can explain how some software design principles are necessary to follow for specific use cases.Like making rest APIs that are secure etc. I would love to learn more from you .
Really useful info for organising code in a professional way, I need to rethink all my software robotics projects, your tutorial helps me a lot, hope in future you will continue this subject about smart software design and organising
Thank you, your videos and content are amazing. Keep going!
Great video, Tim. I appreciate it! :)
You're great! Thanks for all tutorials :))
Thank you, Tim, for a great video and explanation. it was superb.
Tim, as always a brilliant video. Looking forward to more in this series. If I could with for a series, it would be something about setting up a CI/CD pipeline on e.g. GitHub, including pytest, build and deploy. If I am really to dream big, it would include packaging in a container and deployment :)
Your latest videos have great content!! Congratulations sir! Thank you very much!!
Now i have a higher sight of programming. Thanks you so much
You Set The CZcams On Fire With This Helpful Video.
love it and thank you for this man , and love all your videos
Mien i love this guy, Thanks bro really appreciate it, everything sync with perfectly
This is a GREAT video and it was posted just at the perfect timing!
I´ve been looking for guides that could teach me how to arrange the codes better for several days. I´ve read books and watched videos in three different languages but still couldn´t find the best answer. Then I found this excellent tutorial, thank you very much, since it really helps me a lot!
Furthermore, I´m really hoping to see you explaining the execution order of python codes. I´m having difficulties to arrange them when I have to introduce classes, define functions and instantiate a window with multiples widgets for my simple GUI at the same time. I don´t know which part should come first and which next. I would appreciate that, if somebody can recommend some chapters from books or some videos to me!
ordering: imports, constants, classes, functions, mainline
@@TechWithTim Thanks!
This is the first time I am learning Python and it is really helpful
4th. I always watch your videos. They're so good!
Very clearly put across. Great job. 👍
I am relatively new to Python and this information was really useful
Thank you. This video helped me under stand this issue better.
Thank you, Tim. very useful! :-)
Hey Tim! Awesome video. I learnt a lot. I have a question. With regards to the guessNumber class, is there an order in which you code the class? In other words, what would be the first method you build inside the class? Would you start from __init__ or do you start from play. Also, when building get_guess(), is the valid_number() method already implemented? How do I structure the building of the class? Thanks :)
Thankyou for providing us valueable content ♥️
Really useful information. Keep up the good work!!!
Hi Tim. Thanks for this awesome video. Very helpful to get a broader perspective on what clean code looks like and how it functions. I also found it very helpful to start with poorly written code and how to transform poor code into clean code. 🙂
Very nice. Thank you, sir. Clear, concise and useful information.
Super helpful on "where to go next"
thank you tim, this is really worth it
Wow 😳, loved it !!
you're really great. thanks for the great content.
This helped me a lot! thank you so much!
awesome and on point. Exactly what I was looking for
Hi Tim, thank you for beeing such a nice teacher!
What is the name of the editor you are using here?
Cheers from Switzerland.
Awesome video. Don't forget the Analysis, Testing, Documenting, Evaluation and Maintenance phases ;)
Love it Tim. Thank you.
Nice video brother, I want to share with you my thoughts about this.
Code reuse:
1- Since the purpose of using the GuessNumber class is just code reuse, it is better to implement the valid_number and get_guess methods independently from the class as separate functions, that way you could use them for prompting the user to input a number in a given range outside the context of the guessing game; and you won't sacrifice the class functionality. When you import the class in another program, you don't need to import the stand-alone functions with it because python will automatically encapsulate the dependencies of the play method implicitly within the imported class.
2- Instead of implementing the guesses variable as an attribute, making it local to the play method makes the game object replayable without the need to reconstruct another object with the same parameters.
3- It is a good idea to not force specifying the number at the construction of the object, instead, provide the option of setting it later when calling the play method. In other words, the game object could be constructed only specifying the range bounds. If the number is fixed at the instantiation, any value given at the play method will be ignored.
4- Another good idea is to implement random number generation in the class by giving the option for a game object to have no fixed number at all. Meaning that when you do not specify the number in the class constructor, nor in the play method, the game chooses a random number in the range by itself.
Simplification:
1- There is no need to name a variable if you are going to use it once. You can still execute .play() from the game object without assigning it to a variable, and that is one line of code.
2- By renaming the method play to __call__, you get rid of the .play thing. And you call the game object directly.
Performance:
Since my programming skills are built more about performance than code reuse and readability, when I see a function executed twice on the same input, my brain hurts. My programming reflexes tell me to capture the output for the second use. While performance is not a real issue in this example, the conversion to int happening twice on the same string still makes me uncomfortable.
And the code becomes like this:
from random import randint
def convert_valid(str_number,mn,mx):
try: number = int(str_number)
except: return
if number in range(mn,mx+1): return number
def get_guess(mn,mx):
guess = convert_valid(input(f"please guess ({mn}-{mx}):"),mn,mx)
if guess != None: return guess
print("please enter a valid number")
return get_guess(mn,mx)
class GuessNumber:
__slots__="min","max","number"
def __init__(self,mn=0,mx=100,number=None):
if number != None: assert mn
Hey Tim, I am a huge fan, I am just looking for design patterns in your playlist. Would there be a course soon for design patterns in python?
great, very unique video for intermediate python developer..want more this type of videos
15:21 there is even a better way (i think) of doing it:
import random
import time
class Game:
def __init__ (self, min, max, times=0):
self.min = min
self.max = max
self.times = times
def startnum(self):
global correct
global pas
pas = True
correct = random.randrange(self.min, self.max)
global guess
guess = int(input(f"Guess Numbers between {self.min} - {self.max}: "))
if guess > self.max or guess < self.min:
print('Wrong Range, reset')
pas = False
else:
pas = True
return guess, correct
def is_Correct(self):
if pas == True:
if correct == guess:
return f'You have won, the correct number is {correct}'
else:
return f'You have lost, the correct number is {correct}'
else:
self.startnum()
def play(self):
self.startnum()
time.sleep(0.6)
print(self.is_Correct())
print(correct)
game = Game(1, 2)
game.startnum()
print(game.is_Correct())
Lmao, this hurts to read, but you've likely made progress since then. Why did this get upvoted?
Wow
Extreme compression
@@duddie4171 I mean, the init function has single underscores, he didn't understand anything from the video lol
Thanks For Making this Helpful Video.
DAMN Just awesome... keep it up dude.
Very clear example of Classes, OOP.
Amazing vid!
hello Tim and thanks for your videos, not always simple but easy to understand (y).
i have a question considering the "from ... import .. as ..." and just "import ....", is it not a little bit complicated to import the functions instead of the whole module? i mean what is the advantage or benefits of "importing the medthodes from the module" and "importing the module and then applying the methodes directly" ??
Thank you. Helps us a lot.
Hey Tim, Thanks for sharing useful information
I got into programming C++ awhile back, glad I made the switch to Python, I can get so much more done with fewer lines of code. One of my for fun side projects is a text based adventure game, kind of like ZORK. In the game, there is a combat system. I did not know how to "randomize" the chances of a successful hit, so I had to have the player open an online dice simulator, to represent random chance. Python has randint and that makes it so much easier to code my text games.
You could've used the built in eand function in cpp, instead you changed languages and chose a language that needs a separated library to generate random integral numbers.
Thanks for this one!
Hey Tim, nice video. What are your thoughts on Django and flask? Do you recommend Python for creating websites?
Hey Tim, could you please make a video teaching when we have to create a new folder or a new file for an especific project? I'm doing a project and I don't know when I have to create another file
Awesome video by the way👍🏼
this was very useful, thanks tim
bingo! i've been wondering about this for a long time!
Amazing video! Thank you!
Excellent video! Thanks so much
Hey Tim, great vid man! Quick question, I have a background outside of tech but I was accepted into a Masters program in Software Development. I'm kinda concerned because I've never used programming software before; however, it's something I've grown fond of and still want to try it. With that said, from someone coming into software design is it difficult to grasp for someone who's never done it before? What can I do to become more proficient in the field? Thanks man.
The best solution for the first problem is
print(*list_of_words, sep=',')
what is * in python?
when I had a list_1 = [1, 2, 3] and I printed out *list_1 it gave me 1 2 3
so what is it and what does it do? and apparently there's ** too, what does ** do?
@master shooter64 * is a destruction operator for any list. In parameters it just pass each element of the list to the function.
For example:
print("24", 62, [], 'Hello')
is the same as
print("24", *[ 62, []], 'Hello')
** does the same but with dictionaries
(key is a name of an argument and value is a value)
print('g', 'g', **{'sep': ''})
@@waltersweetheart8885 oh ok thanks!
Only if you’re printing it
@@NirjhorNath indeed, functional design gives a lot of pros and some cons to you but you have to know where you should put it to get maximum profit. Use better tools for your tasks.
This video is exciting to watch. It seems to be out of world.
You're great, thanks for your videos.
Very good, thanks for making it.