Intro to Python Mocks | Python tutorial

This video is an Intro to Python Mocks from unittest.mock library: what are Python mocks, why we have to use mocks, and when to do it.
How to write Python tests for functions that make a request to external API.
How to use the patch function to test Requests based functions with Python unittest.mock library.
It's a Python unittest mock tutorial for beginners.
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Telegram: t.me/red_eyed_coder_club
Twitter: / codereyed
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Timecodes:
00:00 - ideal testable function, and a unit test for it.
02:29 - example of a function with a dependency on another function.
06:02 - a test for the function with a dependency on another function. Problems that Mocks will solve.
07:48 - patch() function from unittest.mock
11:28 - an example of unit test of a function that makes a request to external API and returns a different result each time it's been called. A mock returns another mock. How to test requests.
Why Python mocks are important:
- Mocks eliminate dependency on network, database calls, calls to OS (it will speed testing)
- we get isolated unit tests,
- we can test methods that have no return value
- reduce test complexity. We don't have to write complex logic to handle behavior of methods under tests.
- don't have to wait to implement other methods.
When should you mock?
When you don't want to actually call an object
Intro to Python Mocks | Python tutorial
• Intro to Python Mocks ...
#python #testing #redeyedcoderclub

[@vikrantmahajan142]

It's an amazing video! You have really broken the concepts into very easily understandable components. Loved your way of explanation! Thanks

[@bonnymunga2969]

You're a saviour man. I had issues with DI and mocks but this video has simplified everything for me. Great explanation!👏

[@williamgillett1756]

Excellent video - great examples - so simple, but complete, I agree with others that your commentary is incredible. You describe what is going on at every step - both in the code and in the underlying logic. Mocks can be confusing to me and you really help break down the concepts so thoroughly. This is my first experience watching videos by you. I will be back for more! PS - I usually use pytest, but it was helpful to see the more traditional unittest methodology applied to mocks. Translating your code to pytest was a good exercise for a newbie like me.

[@TheSirgo23]

This video is just awesome. I was stuck reading docs and couldn't apply it in my test cases. Thanks a lot for this great explanation.

[@AVISH747]

Excellent. I was breaking my head on mock and patch.. now its crystal clear.

[@uchesamuelottah559]

This is the best explanation ive ever seen in my life+!! You're aweskme

[@JonhMalcovich]

Exelent !!! Thanks for sharing this!

[@drystack86]

Fantastic tutorial. Took me from almost no knowlege of python unittest and mocks to very confident. Thank you!

[@RedEyedCoderClub]

Thank you very much!

[@nishugurung2339]

This has been an awesome video. Thanks a bunch!

[@Spayke201]

Amazing video! Congrats and thanks a lot!! So helpful!

[@bikkinarohith1006]

One of the best vedioes on Python Mocks👏👏👏

[@sergeyshevtsov5125]

That's just what i needed right now. Oleg, thank you!
Been watching your channel since 2017, some time supported on patreon, your content never disappoints. You make very clear and understandable explanation on every important nuance, incrementally from easy to advanced stuff. Sometimes I miss, when there are no new videos for a long time :) Big thank you anyway. I personally think that you made a huge, or even biggest contribution(not size, but in terms of quality, for sure) into instructional videos for Russian self-taught python developers, and now for International community. Time ago your videos helped me to learn a lot of things, to get a first paid developer job and etc.
Legend!

[@RedEyedCoderClub]

Thank you very much for your kind words :) Glad that you like my stuff.

[@meriem623]

+1 !

[@RedEyedCoderClub]

@@meriem623 Thank you

[@vibhourjain]

this is great video, with this one video i wrote my 1st unit test case of my project. Thanks

[@rugmaable]

Thanks for the explanation. The mock is very powerful. I feel conformable starting to use it now

[@user-fj7cg1qn2r]

Great explanation and easy to understand, thanks!

[@bactran7799]

amazing, I can understand mock and patch now. Thank you so much

[@shiblyaziz4528]

Your work is excellent, thank you!

[@sandeepamarnath2272]

Very well explained!! Thank you!

[@stelecoms00]

OMG - you have made it so easy !! Thank you so much ❤

[@brajesh42]

Amazing video. Simplified demo on how to write UT with mocks. Thanks

[@PlanetLogical]

Great video. The explanations are extremely clear and easy to follow.

[@user-xc7ow8rf9w]

Excellent tutorial. Thanks!

[@durgeshkshirsagar5160]

Great tutorial. Thank you for sharing the knowledge.

[@philveo]

hi, i have seen many and many tutos python mocks, but this one is simple, clear and understable. 👍 and many thanks !

[@RedEyedCoderClub]

Thank you very much!

[@user-fw4od8cg5s]

I get a lot of knowledge by watching your video lessons. Thank you very much!

[@RedEyedCoderClub]

Thank you

[@emma_promise_smartnbc4331]

Thanks. Was finding it difficult understanding, U made it clear

[@khadija3246]

Thank you! This is a great explanation. :)

[@hummels11001]

Amazing video!

[@odint.serega1099]

Thank you, everything is clear and understandable!

[@RedEyedCoderClub]

Thank you!

[@abdulmagomedov]

Awesome! Thank you very much!

[@RedEyedCoderClub]

Thank you for the comment!

[@user-ep1rd5pw1w]

Thank you for a detailed and informative video tutorial. I look forward to new lessons from you.

[@RedEyedCoderClub]

Thank you!

[@user-fs3yf5gq9i]

Your work is excellent, you help me a lot, thank you!

[@RedEyedCoderClub]

Thank you

[@arinamiheeva2554]

Great. Just what I was looking for.

[@RedEyedCoderClub]

Thanks for comment!

[@abrikosa717]

Thank you for the guide. It's indeed very interesting and useful. Subscribed!

[@RedEyedCoderClub]

Thank you very much!

[@josesalgado3540]

Great video!!! Thank you so much.

[@RedEyedCoderClub]

Thanks for comment!

[@von-fur-wegen-gegenolli9196]

Great explanation!

[@meabhgrogan]

This was so helpful thank you 🙏

[@user-fl7px4hz9d]

THATS what happened to your previous channel. Such a great surprise to occasionally find out that you are not done with youtube.
Since me watching my first video on your channel many things happened, and even after all those years i can definitely say that your material is way beyond the others in terms of quality.
Keep it up man

[@RedEyedCoderClub]

Thank you very much!

[@maximoarceci9424]

that was a amazing video. Thank you!

[@RedEyedCoderClub]

Thank you!

[@scottwickersham2408]

Excellent explanation! Nice job!

[@RedEyedCoderClub]

Thank you very much! Have a nice day!

[@joaosousa6427]

Excelent information and examples, thanks bro!

[@RedEyedCoderClub]

Thank you for the comment!

[@annaaniytkina5963]

Thank you for the video. Always very informative.

[@RedEyedCoderClub]

Thank you!

[@kostya9169]

Cool and clear video tutorial. Thank you this is very helpful.

[@RedEyedCoderClub]

Thank you!

[@evanliu6158]

🎉 very nice explanation

[@pythongabi]

Thank you, a really helpful video. I like the examples chosen for the video. +1 subscriber

[@a_mortal7511]

Thanks for the perfect example, I wish I could like more than once 👍

[@RedEyedCoderClub]

Thank you! There are more videos to like and comment :D

[@Slone-uk1is]

I am appreciated for this great tutorial!

[@RedEyedCoderClub]

Thank you!

[@_KREKHOVETSKYI_]

I'm taking courses that have this topic. I didn't understand anything there at all. However, as soon as I watched the first 10 minutes of your video, everything immediately became clear. Thank you very much!

[@RedEyedCoderClub]

Glad to hear! Thank you for the comment!

[@user-fc9gq1on1w]

This is something new for me. Thank you.

[@RedEyedCoderClub]

Thank you!

[@user-oo6fi3hk4t]

This is a helpful video. For me exactly. Thank you.

[@RedEyedCoderClub]

Thanks for comment!

[@Bholu420]

Nice tutorial

[@kostya9169]

Thank you very much for such a detailed and informative video tutorial, this information is very important to me.

[@RedEyedCoderClub]

Thank you!

[@serg_D]

The video review is very informative and useful. Thank you.

[@RedEyedCoderClub]

Thank you!

[@freelife1000]

thx, crystal clear.

[@RedEyedCoderClub]

Thank you!

[@munibarshad7454]

Thank you, beautifully explained

[@RedEyedCoderClub]

Thanks for watching!

[@ygr4943]

شكرا ❤❤

[@suprajakarumanchi9683]

Very good Video. Example chosen is very apt to the real world programming

[@RedEyedCoderClub]

Thank you!

[@OlegBosi]

Very good!!!!!

[@RedEyedCoderClub]

Thank you!

[@user-ej5sh7et8s]

This is an interesting video. For more of these in TH-cam 👍👍👍

[@RedEyedCoderClub]

Thanks for comment

[@user-jp3cz7ul6m]

Video is great! It was interesting.👍👍👍

[@RedEyedCoderClub]

Thanks for comment!

[@zakchips]

What a gift! Thanks.

[@RedEyedCoderClub]

Isn't it too basic for you?

[@zakchips]

@@RedEyedCoderClub But it was only introduction. And may be you'll find some time to continue this topic comparing different approaches in mocking. what are advantages if present in module requests_mocking (or responses) comparing with unittest.mock patch. Or creating custom exceptions working with raise_for_status (had some troubles testing them at my work). Thank you very much.

[@RedEyedCoderClub]

Yep, that's right. I knew that it's too basic for you, and planned to make more.

[@jantttez]

братишка лучше гайда не видел успехов тебе от души

[@duke007x3]

Thanks🙏

[@RedEyedCoderClub]

Thanks for comment, and have a nice day!

[@RedEyedCoderClub]

What video should I make next? Any suggestions? Write me in comments!
Follow me @:
Telegram: t.me/red_eyed_coder_club
Twitter: twitter.com/CoderEyed
Facebook: fb.me/redeyedcoderclub

[@goodevening2144]

github?

[@EmadRahman_eee]

Amazing tutorial. Please make a series on Pytest. Thank you.

[@RedEyedCoderClub]

Thank you! I'll try!

[@user-lz8lx1cg3y]

Thanks to the author --- interesting video

[@RedEyedCoderClub]

Thank you!

[@yanuareko4307]

Thanks

[@RedEyedCoderClub]

Thank you very much!

[@ininim]

Thanks you so much for this interesting and detailed guide. Will there be videos on testing with pytest?

[@RedEyedCoderClub]

Thank you! Yes, a planned to make videos about pytest. Stay tuned.

[@sutischolar]

My god, thank you

[@RedEyedCoderClub]

Thank you for the comment!

[@Evilflesh666]

Дай обниму братюнь, отличный видос, спасибо.

[@RedEyedCoderClub]

Всегда пожалуйста

[@avbolshakov]

Спасибо! Хорошо бы возобновить рубрику "ответы на вопросы") Но уже на английском

[@RedEyedCoderClub]

Ага, только вопросов что-то не много совсем

[@maxjokar7920]

Hello, or privet,
Whatever, thanks ever so much for ur video. Ure superman 👍🏻🌹👍🏻

[@RedEyedCoderClub]

Thank you!

[@sagarhm2237]

sir how to write unit test for url loding , and websit proper loding

[@maronthehill]

2:10 How is the test_add() method called?

[@alexdzehil7194]

Спасибо)) Только в работе как раз необходимость возникла в тестирование углубиться, а тут такой подгон. Спасибо Олег, во многом и благодаря вашим роликам сменил профессию с тренера по футболу, на пайтон разработчика!)

[@RedEyedCoderClub]

Вау, это круто! Не поделитесь ли историей перехода?

[@alexdzehil7194]

@@RedEyedCoderClub если коротко то можно глянуть на ютубе "Moscow Python Podcast из преподавателя в разработчики". Если чуть длиннее, то переход занял у меня ровно год активного изучения питона. Начал с бесплатных курсов на степике, там же курс по линуксу, затем книги и в том числе делал блоги на джанго и фласке по вашим обучающим видео с русскоязычного канала. Затем платные курсы от создателей подкаста в который меня потом и пригласили. Скажу что то что прошел ваш курс и сделал блог на джанго мне очень пригодилось при прохождении платных курсов. Там суть в том что короткая вводная часть и затем проект на фласке или джанго, я выбрал джанго и чувствовал себя поувереннее своих сокурсников, успешно защитил проект и устроился на работу. Компания у нас небольшая да и в современных реалиях от разработчика при постановке задачи также требуется грамотная систем логирования и тестирование. Вот сейчас углубляюсь в тестирование и логирование также по вашим роликам, так как на курсах этому уделяется очень мало времени.

[@RedEyedCoderClub]

@@alexdzehil7194 Спасибо большое за ответ. Я вас от всей души поздравляю и желаю вам успехов! Действительно очень здорово, что вы вот так взяли и переключились. Это очень тяжело. Не каждый так может, а вы смогли. Просто прекрасно!

[@Mehdi-hw6yi]

Thank you for the video, very clear but how can you mock multiple elements in one function? For example if a function calls two functions.

[@RedEyedCoderClub]

It's a good question!
First of all you can use more then one @patch decorator
@patch('main.one_func')
@patch('main.two_func')
def test_function():
pass
Also you can use patch as a context manager. Smth like this:
with patch('main.one_func') as mock_one_func:
pass
Also you can use patch() inline. Smth like this:
mock_one_func = patch('main.one_func').start()
...
mock_one_func.stop()
It's all about the scope.

[@Mehdi-hw6yi]

@@RedEyedCoderClub Thank you, I have tried the first two solutions and they work well. Not sure how to use the last one though.

[@RedEyedCoderClub]

It's great!

[@LuisAlonsoLopezLopez]

Can you make a video but using Pytest please?

[@ulisespallares8]

👍👍👍👍👍👍👍👍👍👍👏👏👏👏👏👏👏👏 THANKS

[@RedEyedCoderClub]

Thanks for comment!

[@user-yq4bg1sy7m]

Many Thanks. Can we get code written?

[@RedEyedCoderClub]

Sorry, no. It's just an example

[@subrinalazad3215]

Thanks for the video.
I'm facing a error when running the test.py
ModuleNotFoundError: No module named 'main'

[@RedEyedCoderClub]

Ok, have you the `main.py` module?
What's you directory/files structure?
Did you check your code twice?

[@benjamintanchingjui6741]

I think the url no longer works for the jokes?

[@RedEyedCoderClub]

it's a pity, but you can use any other API or a website.

[@Flowmastaz]

Your voice sounds exactly like Oleg Molchanov. Where are you from?

[@Flowmastaz]

А, уже увидел, что это ты и есть) Класс, часто твои ролики на русском смотрю, теперь видать и на английском буду. Кстати, у тебя хороший английский. Долго учил?

[@RedEyedCoderClub]

Не знаю, трудно сказать. Думаю если бы занимался систематично и регулярно знал бы его значительно лучше.

[@kacperwodarczyk9349]

Finally I found great and not arabian tutorial

[@4rtcrt321]

Олег Молчанов енто ты?

[@RedEyedCoderClub]

Да, это я

[@4rtcrt321]

@@RedEyedCoderClub узнал по голосу.
Спасибо за отличный контент!
Потдержу тебя чем смогу)

[@RedEyedCoderClub]

Спасибо! Рад, что нравится

[@tamarastepanova6435]

This is something new for me. Thank you.

[@RedEyedCoderClub]

Thanks for comment!