शैडोइंग अभ्यास: #62 Python Tutorial for Beginners | Generators - वीडियो के साथ अंग्रेजी बोलना सीखें
पाठ बनाया जा रहा है...
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Welcome back aliens, my name is Davin Reddy and in this video we'll talk about generators.
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Now in the earlier video we have talked about iterators.
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So normally we use iterators to print or to fetch one value at a time.
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So let's say if you have a list of values, let's say 100 values, And if you want one by one value, what makes sense is to use iterator.
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But there are small issues with iterator right?
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The first one you need to get the iterator where you have to define those two functions.
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Next and iter.
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We don't want to do that.
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We want Python to do it for us.
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And that's where Python says, okay, if you want iterators, we will give you generators.
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Okay, but now you will think we have two different concepts.
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Not exactly.
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Generators will give you iterators.
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Our job is done, right?
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So generator give you iterator.
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But how exactly to create a generator?
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So let's do that.
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So what I will do is I will just jump to Another file which is gen .py, you can create your own file there.
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And here let me define a function.
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That's right, we have to define a function, not a class this time.
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So let's say our function define and we'll do the same thing, we'll return the top 10 values.
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So we'll say top 10 and this will return the top 10 value and I will call this as well.
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So I will let me just say I have values and this will be top 10.
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So top 10 is.
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a function which will give you the iterator.
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But hold on, a function cannot give you the iterator, right?
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A function has to be something special.
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So we have to convert this function into a generator.
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And the way to do that is, Normally in function we write return, right?
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So if you say return 5, so this values will be having 5.
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But if you instead of saying return 5, if you say
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e -gildify your job is done because e -gildify your special keyword which will make your function as a generator.
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but now you will think what's the difference even return will
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give you the value even it will also give you the
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value what i will do is i will just go back here let me just print the value
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and if you run this code
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so you can see we got a different thing instead of
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getting a value 5 we got a object of generator
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and that's the thing you know because generator gives you an iterator
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so this function is not a normal function this is a generator because we are using yield yes if you will be different.
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A will also return the value back it will return in the format of a iterator.
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And everyone knows if you want to fetch something from an iterator, we have to use the next Let's run this code and you can see we got 5.
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But now you will think, okay, that's fine.
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Even return give the same output, right?
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No, there's a difference.
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In yield, since it's a generator which will give you iterator, you can write multiple yield statements.
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So let's say yield 1.
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Let's copy this.
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Let's do it for four times and then they will be having different values here 2, 3 and 4.
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Now you can see we got 4 yield which is 1, 2, 3, 4 and if you run this code, you will only get the first value because you are saying next only once.
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So this is same as iterator where you are getting multiple values, right?
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So you got your own iterator without using next and iterator function.
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Let me just do that one more time.
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I will say next.
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Yes, you can also say next and in bracket you can say valves.
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That's a choice you have.
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Otherwise, this will work.
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You can see we got one, two.
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In fact, we can also use a loop.
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So let's use a loop.
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I will say for I in valves.
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I'll let you print I here.
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The moment you do that, you can see it will print all the values for you.
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The remaining values which is three and four.
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This is how you can create the rate up just by using that one particular keyword which is yield.
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Okay, now there is another example we can take here.
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Example, let's say I want to print top 10 perfect square.
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You can do that.
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So let's create one.
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So what I will do is I will just remove this part.
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Okay, because the logic will change.
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Everything else will remain same.
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Let me just not do this.
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Let's use a for loop to print all the values.
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But what should be logic?
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So what I will do is I will say I will take a variable
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which is i initially or maybe n will do n is equal to 1
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and now since we want to print all the perfect square we have to use a loop.
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I will not be using a for loop here because indirectly for uses iterator.
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Let's use while so I will say while n less than equal to 10
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because we want to fetch top 10
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and every time you find a new value you have to just have to say yield.
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You can say sq is equal to n into n that's how you find a square.
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Once you got this square you can simply say yield and you can say sq.
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Okay, so we are sending the value right.
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So it is almost same as return but then return will terminate the function this will not.
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That's something you have to remember.
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Now, once you say sq you have to say n
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because you have to also iterate your n right you have
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to say n plus is equal to one i guess our job is done this should work let's try
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so i will just run this application
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and you can see we got top 10 perfect square we got 1 4 9 16 25
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so that's how you can do it
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because this yield will give you the next next value
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because see when you say you're running a loop you're fetching one by one value
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so when you fetch the first value this yield will return one when the loop says hey i value, it will give you nine.
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So that's how you create a iterator using a generator.
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But the question is why someone will use a generator?
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Think about this.
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Let's say you are fetching 1000 records from a database.
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So when you say you're fetching 1000 records, maybe you want to print all, or maybe you want to process something from those records.
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So when you say you want to fetch 1000 records, all these 1000 records will be loaded in your memory.
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We don't want that.
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Maybe you want to work with one value at a time.
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So let's say 1000 records, we want to work with one value at a time.
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In that case, you can use generator instead of using, instead of fetching the entire list, you can fetch one by one value.
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So that's something you can do with generator.
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That's maybe you can call as a real -life example.
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So this is how we use generator with the help of yield keyword.
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So I hope you enjoyed this video.
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Let me know in the comment section and do subscribe for other videos.
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Bye.
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you
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इस पाठ के बारे में
आप "#62 Python Tutorial for Beginners | Generators" के साथ Shadowing तकनीक का उपयोग करके अपनी अंग्रेजी का अभ्यास कर रहे हैं।
शैडोइंग तकनीक क्या है?
शैडोइंग (Shadowing) एक विज्ञान-समर्थित भाषा सीखने की तकनीक है जो मूल रूप से पेशेवर दुभाषिया प्रशिक्षण के लिए विकसित की गई थी। विधि सरल लेकिन शक्तिशाली है: आप मूल अंग्रेज़ी ऑडियो सुनते हैं और तुरंत इसे ज़ोर से दोहराते हैं — जैसे वक्ता की छाया 1-2 सेकंड की देरी से। शोध से पता चलता है कि यह उच्चारण सटीकता, स्वर, लय, जुड़ी हुई ध्वनियाँ, सुनने की समझ और बोलने की प्रवाहशीलता में काफ़ी सुधार करता है।