#61 Python Tutorial for Beginners | Iterator

Github :- github.com/nav...

[@swethasundaram04]

The raise keyword is used to raise an exception. You can define what kind of error to raise(here its StopIteration).

[@shivasaiprasadakula7386]

I was made mistake while Entering the code like (stopiteration...but the s should be caps ) after watching your comment I entered Caps S Now I Got the correct code without error thanks... 👍🥰

[@sriram9786]

sir can you put another vedio on this. i dint understand completely.

[@BryceDoesLife]

This was exactly what I needed thank you

[@bhu1868]

seems like you are an music artist, do u use python in music some way?

[@mohammadziauddin6270]

There was an indentation error at return val thats why its repeating., remove 1 space before return.

[@prsh1989]

why we use iterator? I mean if we have for loop, then why iterator? Any real world programming example where this is used?

[@sheikwaris]

have same question

[@naveensai4039]

@prsh1989 for suppose, if u have a string list and then u r trying to check if the list contains one particular value then u need to use iterator to check whether that specific value is present or not. Let us consider another example, suppose u r building a well built structure and if u don't know the length of list or any collections then u need to use next method in iterator and fetch the values if the list contains values in list

[@malakhassan9816]

How we typed self.num and we hadn't typed method named num or class nemed num?..num is not defined..

[@telugu_rockzz]

It is not a parameter it just initialised

[@Shrishivbharat]

Sir, when will you make videos on tikinter and other python GUI?

[@sohailanwar7536]

In pycharm you can use (control + d) to copy the line and paste it onto the next in the place of using (ctrl + c) and (ctrl + v).

[@mehulsharma7333]

Thanks 👍

[@gokulkrishnayt]

Thanks Buddy😊

[@atlasatlantis8447]

I'm pretty sure it's the same for all windows programs. You can even copy youtube comments this way.

[@AshiqAli-ie5pm]

Thanks bro

[@adilbougma2706]

omg you are a true programmer :D i lauoh so hard when the output print None. i like you debuging method

[@ajaybhandari9215]

at which point in the video?

[@Someone-kw6mw]

binod bonod

[@harshamin7996]

Sir, Why can't we use break in else part to stop the execution of for loop ?

[@realsumitkumar]

Break is used only inside a loop

[@HackingWithCoffee]

Sir can you please create video on data structure and algorithm

[@harshavardhan.g351]

watch jenny lectures for ds and algo

[@bhaveshjhawar9532]

watch code with harry .. thank me later

[@schruteman7444]

@@bhaveshjhawar9532 thank u

[@utpalpodder-pk6vq]

whether during the creation of the object itself __iter__() method is called just like __init__() method? Is __iter__() method is called only once?

[@pinakibhattacharya2761]

and instead of giving exception in else part can we give break statement at the end of if statement?

[@rajeshwardutta]

I don't think you could. Break works for loops, but IF is a conditional operator.

[@puneet8705]

not break but breakpoint will work

[@addagallanaresh4044]

@@rajeshwardutta switch is also conditional entry but it supports break..its not a loop

[@sivasaran4]

can we use break instead of "raise stop iteration"

[@virtualmagic5489]

same doubt

[@karthikreddy4430]

@@virtualmagic5489 break can only be used in for loop and switch i guess

[@pradeepmedikonda7282]

What is the use of iterator while we have a for loop and we can go for a every element of the list....

[@adnanfaisal1085]

same queston

[@moisesdiaz9852]

same question here too

[@moisesdiaz9852]

I just found it, its because iterators use much less resources than the traditional loop

[@sanjaykrish8719]

internally the list is an iterator that has next and iter methods implemented and that's why you could use the for loop in list. What Navin teaches is you could create your own custom iterator

[@bmanicharanreddy7386]

actually for loop made up of iterator object

[@jimmymesa]

print(next(values)) prints 1 and also changes the state of the iterator after which num = 2. So the for loop will print the numbers from 2 to 10.

[@xtonx-theofficialbeechslay1575]

i geniunly have a hatred toward people using light mode

[@komaljoshi2272]

hi sir,I don't have IT background ,completed B.Sc. Zoology in 2013, now keen to join IT field,so can I start my career in Python ? Are jobs available for fresher Python Developer in market? Could you please guide?

[@anujdahiya341]

i'm in somewhat same situation

[@OasisFinder]

Python is booming in terms of job in 2020. even if you are not from IT learn this , take your time and you can

[@divyanshusingh6105]

I really Want to thank you Navin Sir..My college faculty never focus on the concepts of programming they are just making us rattutota... Thank you so much sir for coming on youtube and helping the students

[@balla4004]

What is meant by rattutato

[@rayyanamir8560]

@@balla4004 He means rattu tota.

[@amalayakin4411]

Our college also the same scenarios happens

[@vishutanwar]

@@balla4004 means they just make student memorise programing

[@zeeshanshahidansari9425]

Nice mustache! It suits you Sir. :-)

[@shrihari8886]

hiii bro, create the own class that not repeat again values...but inbuild the value or nums it can repeating ....i wanna clear about it this video

[@omkarmore7017]

Can someone or Navin tell me this that why are we not converting that TopTen class object 'values' to iterator object i.e like values = iter(values) As you are not creating iterator object in last example how is __iter__ method getting called or how is it working without it. As far as i know if we create an object of class only init method gets performed without calling. Please Help me with this. And Cheers to your work Navin. Thank you very much

[@akashgandhi7886]

first example in list: values are repeated but while creating our own iterator values not repeated why this is happen plzz give me the difference of this scenario

[@HassanRahamathullah]

In first example with list, if you observe carefully, he is performing for loop on the list object not on the iterator (it). If you perform for loop on "it" it would continue from where you left using "it.__next__()" function.

[@shaiksubhan2306]

What is going on behind for loop it is good,,,, but what is the use of iterator

[@banti000]

Iter is linked to next , how and what it's doing,(return self) !

[@harshavardhandsh5190]

I could not understand the benefits of iterator over cute for loop

[@aldrinsaurovsarker5159]

@@harshavardhandsh5190 used in data structures

[@sagarr1640]

By this way are v overloading the Iter & next inbuilt function ?

[@siddharthmishra8233]

yes sort of.

[@mrvilgax1183]

how many of you went back video and see he have mustache(search meaning in google) of our teacher 😂🤣🤣

[@ursABD]

In if condition can we use break to stop the iteration 9:33

[@Engineerincubicle]

Sir, My Final Year Project is on Virtual Mouse using Hand gestures using OpenCV and Python,Can you please help me in this,Sir?

[@merowe123]

Nothing is free

[@siddharthrautara8811]

sir can you let us know a real life example where we use iterator

[@pothalasiva4820]

Sir why can't we use break statement 🤔🤔

[@prakharprakashverma2409]

bcoz break keyword is used to break loops but here if condition is used

[@zakiasmaa6834]

I really want to Thank you Sir for all the efforts and also for your nice energy, I hope that you still have this awsome energy and vibes, God bless you !!!

[@sakthivadivel1057]

class TopTen: def __init__(self): self.num=1 def __iter__(self): return self def __next__(self): val=self.num self.num += 1 return val values = TopTen() for i in values: print(i) ------------ i'm getting error like: TypeError: 'TopTen' object is not iterable ------------ Could'u help me to fix this ?

[@cinemaplus150]

Sir can u make video for machine learning usking sklearn lib for data science

[@naesone2653]

wow you really explain well and are one of the few indians that have no accent almost respect

[@ryouko2971]

Under the def __iter__() method, why are we returning self only? And what does he mean by 'returning the object' when using this method? It's just a self keyword with no parameters. What does this mean? Please help

[@guru_bro]

Bro do u got ur answer please explain me. I'm stuck for days

[@30.ayushyadav41]

instead of for why we don't use while i

[@haaahaaa8396]

Sir, where have you learnt all this stuff . I am watching the whole series,your concepts are strong. Can you please tell me which course or way should I choose , For web development via. Python. I am cs student. 2nd yr

[@mohammadmohsinmohammedmohs9717]

Even I am second year student, can you tell whether you are understanding oops concepts?? I'm not able to get it

[@hxrsh_x]

@@mohammadmohsinmohammedmohs9717 seach for "Corey Schafer OOPs tutorial in Python"

[@OasisFinder]

The way sir explain things is clear that its his past over all experience and strong understanding of OOPs, The reason i said this because every developer has its own way to clear concepts, Maybe you clear your concepts by watching or reading other videos or book.

[@amritanshusinghbhumihar]

Experience.

[@dobbysurfs]

Im sorry to say your explanation is becoming staler and actually complicates the concepts,for the last 3 videos including this one .i had to go to another video and learn it and comeback here.i hope i don't have to do that every video from now on

[@keerthichowdary750]

sir!!!! in the before example u have shown the repeation of values getting in output...but in this example why it is not repaeting 1 and taking next values......

[@dhamoramesh8210]

have you cleared that doubt ? if yes please explain

[@vikaspal2799]

Why do we need the iter() method while defining our own iterator???

[@user-rn6zc7vp3h]

Yeah no need of iter if our class have next method and we are not even calling iter

[@dobbysurfs]

You are making your object an iterator ,next method can only be used if there is an iterator.

[@santhoshbyri125]

break also possible

[@arifurbhuyan8372]

not sure why this particular lecture was needed :( .. was very confusing

[@RamKaruna-em3xh]

Sir other way to stop the loop is self.num=self.num+0 , is this right sir

[@tanaysamanta4730]

def __iter__(self): return self What is the reason of using it? Can anyone explain?

[@yashsalvi6850]

Can someone help me know that what happens after "for i in values " is called ?

[@ContentArm]

__iter__() is called and then __iter__() calls __next__(). __next__() runs till the exception is raised.

[@guru_bro]

@@ContentArm can u elaborate on this please maybe on insta

[@farazahmed1668]

Hello sir, love from Pakistan...!

[@ITSkillswithSurajDatir]

looking handsome

[@chandrasekar3653]

I just debug and found how that statement for i in values just calls the next function in Topten class , every time after printing the value of i . This is awesome . You should include a debug session in this video itself.

[@nithinsamudrala9697]

Chandra Sekar how can for loop call next method?

[@shivangigoel9170]

class TOPT: def __int__(self): self.num=1 def __iter__(self): return self def __next__(self): if self.num

[@shivangigoel9170]

@Leonardo cool thanks

[@chandusree3248]

That is --init-- not --int--

[@subasrim962]

Your mistakes for loop...for I in values Print (i)

[@prachinainawa3055]

It will be very very gladful if you give sometime in answering the good questions asked by us. Because we get into some confusion whose answers are not available on google. Then we got stucked there. So please at least give us any opportunity to get the confusion clear in between 2 days so that we will also don't lose the interest in clearing the questions. If you don't have that much time then you can also answer only necessary and tough questions.

[@OasisFinder]

agree.. but thing is not everyone read comments or those who read dont go deep down in comment section, Just like i replied your comment after one year lol

[@guru_bro]

Can u help for one doubt please I'm stuck for days

[@OasisFinder]

@@guru_bro Where?

[@guru_bro]

@@OasisFinder what does iter Dunder method do and y it returns self what is the use of returning same object which is passed?

[@sepehrtavakoli591]

It prints 1to10 but if we remove for loop it will give you only one

[@mayankrajput2889]

Can we say we are using method overloading here?

[@sowmya6005]

why even without calling iter and next methods they are running

[@KoreanPanda]

I'm confused. Couldn't we just print "nums" to output the values? Why did we need a "for" statement to display all 4 values?

[@onnlyfutebol]

I still can't seem to comprehend the word iterate, aswell when he says it 'loops' over. I would really appreciate if anyone could dumb down the explanation as much as possible I'm desperate to understand this concept lol. Thank you in advance

[@rajkumar-nx1me]

sir what is the advantage of iterator over for loop

[@narragopichand9982]

If something is returned in a function it return value to function call right ? What is happening to return here. Object is being returned......

[@p.l.ramakrishna4015]

we are hearing to learn, not checking your talent.

[@bharathkumar5870]

list is already an iterator.why making it iterator again

[@hassnainamjad1059]

modified iterators form where to start and where to stop: class ur_choice: def __init__(self, num): self.nums = int(input('enter from where to start')) def __iter__(self): return self def __next__(self): if self.nums

[@pramitharyan5167]

one more video on iterator please

[@AbdulKalamchessebank]

Complex program...😥

[@Abhishekkumarsingh-sl5yz]

sir after class python is becoming difficult any suggestion

[@mounikak3818]

what is the use i dint understand when u want to print one by one it is done in 1st example bt in 2ns e ample own iterator all numbers are printed at once not as u told one by one dint understand what’s the real use u want to tell sir

[@ElyasSAhmad]

class iterator: def __init__(self): self.a = 0 def __iter__(self): return self def __str__(self): return '{}'.format(self.a) def __next__(self): if self.a

[@rakeshmali1727]

at 5:11, why did the for loop print 7 and 8 again? this contradicts with 10:22 no?

[@Shubhamfoodshorts]

since we already have for loop to iterate the list then why are we making things more complex by making this iterator

[@iamniks]

sir i have a question Why u used " raise StopIteration " ? why not u use " Break " instead ??? please explain anyone

[@OasisFinder]

break works on LOOPs "for" or "while" not conditions like "if"

[@mohamednayeem2602]

this we can use for interview question but for loop is the best. I haven't used this loop in my entire life

[@virtualmagic5489]

What does that __iter__() method do here sir

[@vanshikasharma481]

hiii bro, create the own class that not repeat again values...but inbuild the value or nums it can repeating ....i wanna clear about it this video

[@vanshikasharma481]

help me with this pls

[@saicharan4669]

Sir the video is a little bit confusing regarding creating an our own object of iterator My doubt is initial part of video we created our own iterator object that is it,then what is the difference

[@dragonwarrior7442]

class Habit(Str): pass print(Habit("yellow")) O/p :. Yellow How it works internal Plzzz sir it's important for me

[@placement3608]

It's so simple bro

[@placement3608]

Pass used so it will skip that part

[@telugutravellerraj]

It gives error "NameError: name 'Str' is not defined". How did you get output 'Yellow' ?

[@paristar3079]

@@telugutravellerraj You first have to define a class named Str and define init method which takes in a string ... Remember the case sensitivity And it still won't output yellow ... It will print the object itself

[@srushtiagarwal2748]

very interesting and knowledgeable tutorial.👌👍

[@KeremAli-cm3pj]

Also very interesting mustache (❁´◡`❁)(●'◡'●)

[@pratimamaurya8890]

please make series on python turtle

[@alaapsarkar]

print statement prints 1 and the for loop prints 2, 3, 4,..., 10

[@nilimasharma6849]

Instead of raise stop iteration can't we just use a break statement after else

[@telugu_rockzz]

No we can't use it

[@desiandhomemade]

it should not print the value "1" again because now value pointer has moved to next which is "2"

[@bantigarg740]

Hey if we have for loop to print 1 to 10 number, why should we use this iterator

[@tanmayisharma5890]

What happens if we print(next(it)) beyond the range of list? I mean what if we use print statement 6 time if the list has only 5 values? And can we access the index of an element using iter() and next()?

[@ankitchetri2968]

To be honest i understood this better from u sir in comparison to code with harry ,i m not comparing but actually u r a little better in explaining , don't kill me code with harry fans i am also his fan it's just my opinion

[@muzikizmylyf8411]

I like your learning style

[@ahababbinhabibosama2565]

I like your moustache

[@startjourney8631]

Dil se dhanywaad🙏✌️🤗

[@squadslayer9468]

It will give all ten value once

[@Rajadahana]

If you type print(next(values)) after the for loop, you will get an Error.

[@hxrsh_x]

Sir, mere palle kuch bhi nahi pad raha hai

[@Bhabani1994]

concept is extremely good no doubt on that, but your new look does not matching with personality..... but really your teaching style is awesome, thank god that you are providing such valuable knowledge with free of cost...

[@sheikwaris]

Navin, pls stat what is the purpose of __iter__ method at all

[@dhruvchaudhary8054]

sir could you please suggest me a source from where i can practice python, please!!

[@jims9916]

class top ten is not clear

[@saurabhagrawal3251]

For me it's showing topten object is not iterable

[@naingmind5709]

Finally I got this yayyyyy

[@gulshankhanna5621]

Sir class vala bilkul smj ni aaya

[@yamini_ramesh7433]

Object is not iterable sir what's the prblm

[@harshgupta9761]

Why only return self is use under iter block

[@somethingnew6966]

Where are you from?

[@anoshkaniskar1482]

The when you say Iterators. How cool is that..