Python Tutorial: if __name__ == '__main__'
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- Опубликовано: 21 мар 2015
- In this video, we will take a look at a common conditional statement in Python:
if _name_ == '__main__':
This conditional is used to check whether a python module is being run directly or being imported.
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#Python
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Dude, it's incredible how simple this concept is when it's explained well. So many other resources had my head spinning about it, but just one 8 minute RUclips video later, and I'm like "oh yeah well obviously."
p
Ppp
shoot yeah Sam I am.
same boat here I was like what the hell is a __main__ and why should I even care lol. But this makes so much sense. I especially understand someone else's stack exchange comment now about how this is really important for global variables.
I'm glad this is where I looked first. It looked intimidating at first, but he made it make sense.
Seems like a really intuitive feature.
You spoke my mind man….
Subscribed:
That was by far the best explanation I've found on RUclips regarding this topic. I hope you continue to make videos.
I agree with you. I subscribed based on this video only.
no. this shit makes no sense
Tyrone Slothdrop I totally agree
Kevin, of course it doesn't make sense when you're braindead xD
Came to the comment section to say the same thing and I see I was beat to it.
Short answer: this set up gives you the option to run (or not run) a chunk of code when imported from another python file
I got that from the first 20 seconds, it's quite a simple concept for me and I thought up a lot of usecases. Pretty interesting, I don't think I'll watch the rest of the video
@@Dorumin you are so smart
@@pulpil10 Yeah, looking back on this comment it did seem pretty pompous lol, but it really was pretty familiar enough for me to grok like that
An example being a chess program that either runs on the command line if you run it directly or offers an API if imported
@@pulpil10 and you are right
@@Dorumin he explained nothing in the first 20 secs. Does patting yourself on the back make you feel any better?
Hi, Corey. If you ever wonder if you're making a difference in the world, then let me assure you that you are. Your videos make learning and using Python possible for those who watch them.
Beautiful work. Thank you very much.
Thanks!
@@coreymsyeah you helped us so much, thank u
The absolute clear and concise explanation I've seen on this in 5 years off and on of playing and working with Python. Well done!
man you are awesome, I started with the first video of Flask series and now I come here for understand the ifmain conditional.
thanks for your youtube channel, it will be for very much help, I am a new subscriber, like in all your videos.
Greetings from México.
I hope you know that even 6 years after posting your content is still helping beginners like me understand python better than anything else on the internet can! Thank you for your work, it's great! :)
9 years baby
I thought that geneticists are terrible at naming things but coders have their share of confusing nomenclature. Despite that, I got it because of this video! Thanks Corey!
Haven't encountered an explanation as good as this. Thank you!
The world needs teachers like you.
What everyone else said: best explanation available. Thank you very much.
I've literally been searching for this for the past two years. So simple yet I haven't seen anyone explain it better!
THIS MAKES SO MUCH SENSE. I spent an hour and a half today rewatching the video i learned it from and trying to get a grasp on it. Makes a lotta sense when you explain and show it the way you do. It's sort of like a validation prompt to see which file is being run to avoid duplicates etc.
I considered "if __name__ == '__main__'' as some magical conditional check that triggered the main function for me, until I watched this video today. It's clear now. Your explanation was so clear and simple it made so much sense. Thanks.
This is the best explanation with EXAMPLES I've ever seen on this. This will help me tremendously. I salute you!
I have read a lot of articles on this specific topic, but none of them could make me understand this "if __name__==__main__" thing. Thanks for making it simple and understandable. By far the best one I've come through!
I stuck for DAYS on this, THANK YOU SO MUCH for explaining the topic really clearly.
You are the only one whose lecture cleared my concept of __main__ in python.
i subscribed to your channel as soon as I understood the concept. thanks. keep uploading.
Sir, you will live 10,000 years!! Thank you for this informative video. Straight and to the point to which I could easily comprehend.
It's hard to believe that such a complicated concept can be explained like this. Cheers Cory, the great!
It's not that complicated, it's just terribly explained by others
Man, this is the first video where I actually get what this means. You are the GOAT, my friend.
You rock. I'm so lucky, I looked down out of confusion while watching a tutorial because this was used (but I had no clue what it was).. my eyes just happened to see this video suggested, noice
I commend you on your teaching. I struggled with this concept for a long time, now it seems so simple.
New to Python, I'm a C# developer, this video was exactly what I needed... just had to find the right one so it would click. THANK YOU!
I spent all morning finishing your OOP walkthrough videos and just ended with this. You, sir, are amazing.
Thank you very much - I have read and read on this subject but was getting totally confused. This video explains things so much better. Thank you very much. Your video is very explanatory and well done. :¬)
Thanks. Glad to hear you found it useful!
I agree!!!
this video clarified my doubts!!
Your clarity is a godsend! Thank you for the instruction Schafer Sensei!
okay, this person is so nice that he repeated the same thing without sounding repeatative at all. anyway, coming to the point, I think for average,slow,diverted students the video needs to be seen twice or whatever, there's got to be some kind of repeatation; but for focused students he's a great teacher
i've been roaming around for two days now. this is by far the best video i found. just subscribed!
THE best explanation on the subject. Thanks Corey!!
Clearest one I ever found and reference my friends.
So simple, so elegant. Loved the way he explained this. I’m not gonna forget this thing in my entire life. Thank you
Crystal clear and very helpful series of videos. You seem to acutely anticipate areas of confusion for an audience who is looking at the topic with a fresh pair of eyes and then proceed to clarify these doubts with simple but complete explanations and back it up with relevant examples. There are loads of online paid courses that fall far short from the level of your videos. Kudos. Wish someone could teach the hosts of instructors and trainers out there to emulate your capabilities, many of these courses seem to frustrate new students more than help them.
Finally it makes sense! Great video. So I understand now that the variable __name__ is different depending on whether the Python file is being run directly as a script or if it is imported somewhere else. If someone imports it, you can choose for the contents not to be run.
"So, I really hope this video was useful..."
Yes man... yes. Big YES. Damn it, thank you!
And it's not the first time you englightened me.
Feels so good when you get to decipher __name__ = '__main__'. For years it was a huge mystery and blindly went with the flow. Thanks for the clarity distinguished mate!
I'm learning Python on my own and haven't reached the underscored 'thingies', but just watching this video, I understood the whole concept!! Thumbs up!! thx
Great! You're one of the greatest Python tutor on RUclips
this seemingly complex topic can't be explained better that this, thanks a lot for clarifying it...
You are quite literally the BEST explainer in the world! You could take any concept and get the most mentally incapable person to understand it. Great job!
What an excellent explanation -- I finally had that 'eureka!' moment with this topic after my brain failed to comprehend several other tutorials about this.
thos was the best and really honestly ever best explanation for this term I've been always trying to understand! Thanks so so much!!
You say: "Thank for wacht it"...
I say : Thank for teach me !!!!
You r right
NemCorrect:
You say: "Thanks for watching"
I say: "Thanks for teaching me!"
Always on service.
@@nemplayer1776 you did not get the joke!
@@ycombinator765 what is the joke? mind to elaborate?
r/whooosh
RUclips recommendations can apparently read my mind. Thanks for covering this topic!
Finally. I had seen that scary double underscore several times and couldn't figure out what it was all about.
Thank you for the explanation.
I have found a way of conceptualizing this line of code in a way that (for me) may be easier to understand ...
Think of any single individual who is part of a family; we will call this person Xavier.
Let's talk about the relative terms we use when relating Xavier to the rest of his family.
His parents consider Xavier to be his SON.
His sister considers Xavier to be her BROTHER.
His second-tier relatives consider Xavier to be their COUSIN.
His grandparents consider him to be their GRANDSON.
Lastly, Xavier considers Xavier to be HIMSELF.
Xavier is still the same person in each of these relative relationships, but the relative term we use for him is different depending on who we are relating to.
So, when we write, "If __name__ == __main__" then we are effectively asking is: "If == HIMSELF"
If that code evaluates to TRUE, then we know that the program is running on its own - it is referring to itself.
== "HIMSELF"
If, however, that code evaluates to FALSE, then we know that the program is running as a component of another program.
That is, when you run the code "if __name__ == __main__" and it evaluates as FALSE, then it would be **metaphorically** equivalent to the return values being something like the following:
== "SON"
== "BROTHER"
== "COUSIN"
== "GRANDSON"
In other words, Xavier is not operating as HIMSELF, he is operating in relation to some other entity (a subcomponent of another program).
this made me confused as hell at the beginning ;) But is a good explanation too.
Wow thank you for the great explanation!!
it is more like if relative pronoun is not son, brother, etc.. then this is not the main "xavier" it is someone else IMPORTED to this file "family", correct me if im wrong
@@Mr.Jiggle I dont see a problem with your analogy. However, I also dont see a difference. I feel like you identified a difference with no real distinction. If Xavier is your nephew, he's not your child (you've imported him to your family). But if your approach helps you capture the concept, then run with it.
@@EV4UTube thanks, i was just making sure that i caught it right, i almost understand rn, thank you again
THE MOST cogent explanation of python import machinery available IMHO.
Hats off!
you exaplain it simply and clearly. I have always thought this main story was complicated but thanks to you, now I fully grasp it.
This guy explains the best...answers all the questions that appears in the mind while watching...keep going
I found your explanation best........Thank you so much..!!
Such a joy listening to your tutorials. The instructor in my paid course just keeps stuttering and mumbling to the point where I lose the will to live. You are a life saver, easily in the top 3 instructors online.
Thanks! I stutter and mumble a lot as well, but I edit all of that out because I don't want to waste the viewers time. Glad you enjoy the videos!
One of the best Python instructor on RUclips. 👍👍👍
5 years later this video is still great. Thanks for this explanation, it clears up the concept perfectly.
perfectly explained ..thx a lot confusion removed ...
Finally got this. Thank you a lot!
Got recommended two of your videos, this and the working with json data in Python. Both very helpful videos with clear explanations. You earned yourself a new subscriber!
Hi Corey Thanks for making these vedios .. You are by far the best Tutor i have ever seen.. Your Flow of teaching basics is brilliant.. not many cover those.. please continue your good work.. Being simple , clear, to the point is the best way in your teaching .. ..
After three years used python, finally, i know why they use it :)) thanks so much
This is EPIC! Thanks a lot for making this video!
Corey, Man, you are an asset to humanity indeed, keep the good work.
OMG, this is the first time I am getting the concept using __main__, thank you so much for being a great teach!
Thank you! The presentation of information is very clear!
Can't get better explanation than this🙏🏼
you can have waaaaaaaaay better explanations than this crap. He just wrote shit and didn’t bother to explain new stuff
@@heron22wading fuck off. Writing stuff is exactly what I needed.
Agree
@@dr.rijjaayaz8160 ___
@@dr.rijjaayaz8160 sgs
Really liked your way of explanation!! Voice, pace, and clarity of information were perfect.
This is the best explanation for if __name__ == '__main__' that bothered me every time I saw it in a python code and tried to ignore it and escape from it.
Thousand thanks!!
Thanks, clear and super helpful to this beginner!
brilliant yet concise explanation. ThankYou
Thanks, this is definitely by far the simplest and clearest explanation I've read.
I came here because I was confused by a Udemy course I'm doing - your explanation was fantastic and simple. Thank you.
Concise and to the point. Nice :)
Subscribed: Man you explained very well!
Great video. I learned Python from a bootcamp which skipped these essential basics. Very helpful !
You are the best tutor on you tube! Thank you for your wonderful videos. Please add more videos with real world problems.
Very helpfull video , thanks for upload this video
Nice man. Thank you for share your knowledge.
The way you explain it is so clear and very good. I guess because you really wanna teach and your main goal is to teach people and be helpful.
First video watched from your channel and I subscribed. Thank you very much!
Wonderful explanation. As everyone has said, this is one of the best explanations of this topic.
One thing to add though. I know many here are well versed in Python will know this, but for those new to Python here is an example of why you would employ the 'if __name__ == "__main__" in a module. When you build a module, you will want to test it and make sure it works to spec. The beauty of it is that you never have to remove it and it gives you an easy way to test out your module before importing it into other Python files.
Clear conception.
And other puzzle is that I'm interested in learning how to execute and preview the result on sublime text after finishing python?
Probably figured out by now but sublime is a texteditor and not a IDLE.
CTRL-B
Change build system to python3 and then ctrl+b
Great explanation! I completed a graduate program in data science and none of the professors explained this as clearly.
Hi Corey, many thanks...all crisp and clear....same sentiments as the previous viewer's comments ( below ).
It's funny how almost no tutorials I've seen cover this statement, given how incredibly common it is. Thank you very much!
When I found this out at first I couldn't see the usefulness of it but I realized that I could test my modules separately and not have it called within my main program.
Great explanation as always.
Best explanation! 👏👏
See mine too. The channel has Python crash tutorials, and R beginning course tutorials. Step by step, sequentially. And you can download all the source files (can be found in the description of the video).
8 years later and it's still useful! Thank you so much for the amazing video :)!
Holy crap I’ve been looking for a good explanation of this for forever. After not understanding when I first started learning I just skipped past it and always ignored it every time I saw it. But today I decided I was going to sit down and understand it and you made it clear. Thank you.
Thanks Corey this was wonderful!! Just a question when I can use this? Any example from any of your practical programs?
I mean you just use it in every programm (module) for the sake of importing it later on.
2021: These are future-proof tutorials!
Tried to understand this from my lecturers for 3 weeks. Understood it from your channel after 6 minutes into the video. TYSM
I just started learning python. This was the first video that explained it to me. Thank you
I'll be watching more of these videos for sure. My 14 year old son is learning to program in Python, but of course in my day Visual Basic was all the thing, so I have a hard time helping him even though I am very good with VB. The syntax is quite a bit different and the way people use Python is also quite a bit different. Even just the fact that logical statements like if, while, for etc. don't need to be terminated but rely on formatting is new to me. No more "end if". Visual Basic is more like Visual Pascal only without dynamic variables. Shows how old I am. And when did we go back to running stuff from the command prompt? It took me an hour to figure out how to get my computer to launch python that way even with the help of a video. Mind you I wasn't very familiar with setting system variables. I also really miss the "Step" debugger function in VB. I found something similar in Python but since half the time you are in imported code I have no idea what it is pointing at. My son would joke "oh look we are at line 1048 of my 50 lines of code". A video on how that works would be great.
thanks mate great explanation
Ditto...first ever fast explaination
Loved it👍thank u for ur time
It was very helpful ,I stuck here for 1 day. Your teaching is in very simple simple way easy to understand by any one.......
You just cured my anxiety
This is god's work at its best. I struggled with this concept but thanks to this 8 minutes i can now continue with my coding.
Best explanation one could give for this problem. This video was really helpful.
This is the best explanation to this topic I found till today..thank you very much.
Coming up from a C++ and Java world I use the "if __name__ == '__main__':" functionality almost religiously, even though most of the time I dont need it.
___name___
Very well explained. When would you actually need to use this though? I am having trouble coming up with a good example..
The only thing I know if is testing. Define a function and test if it works properly.
Cheers. Finally an explanation that made sense.
How others have failed to explain _that_ is beyond my imagination.
This is the best tutorial so far. This thing is kinda tricky one. Sometimes i understand it but when someone ask me to make them understand, i start thinking maybe i did not get the concept, i have to check again.