Python Quick Tip: F-Strings - How to Use Them and Advanced String Formatting

День тому

In this Python Programming Tutorial, we will be learning how to use f-strings to format strings. F-strings are new to Python3.6+ and are extremely useful once you learn how to use them. Viewers have likely seen me use f-strings in previous videos so this video will go into detail exactly how to use them so that everyone can follow along confidently. Let's get started...
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#Python

КОМЕНТАРІ: 217

@sandeepvk 5 років тому

f string is god send. I am glad I started python in the post 3.6 era

@kamal3777 3 роки тому

Scammers

@farajshaikh5100 2 роки тому

@@kamal3777 ?

@kamal3777 2 роки тому

@@farajshaikh5100 i have no fucking idea

@stuthomas3593 2 роки тому

Another excellent video from Corey Schafer. Easily the best python instructor on UKposts. I'll be switching to f-string from now on.

@lalligood 5 років тому

I've been using f-strings for a while but never about the colon formatting "tricks" before this. Nice!

@theegreatestever2420 2 роки тому

Its amazing how short but absolutely clear and excellently explained your videos are. Thank you from South Africa

@TheVerucAssault 2 роки тому

This is probably the best video I have seen explaining how F strings work. Thanks.

@ajkraftt5480 3 роки тому

This was the first time I liked, subscribed and hit the bell icon before being asked. This explains #fstrings on an intuitive level. Well done with the comparisons as well!

@doruletu1 4 роки тому

Thanks Corey Schafer for f' string quick video explanation!

@WisomofHal 4 роки тому

Wow! Came back to this video after letting f'strings mingle in my mind for a few weeks and this is even more golden haha. Really like the calculation exercise you showed uses f'string it's so cool Python allows us to run calculations within the {} Thanks again coach!

@dsuryas 5 років тому

this is similar to template literals in javascript, awesome. Thanks, bro!

@eop771 5 років тому

Thank you, Corey!

@ishpeace4886 4 роки тому

well-explained and illustrated thanks Corey

@TechReptile 3 роки тому

I have followed your video and get courage to learn python. Thanks god I have find you. You are really a good guy. Thanks a lot. Just carry on.

@slavoie 5 років тому

One cool use of f-strings can be to iterate over a dictionary where the keys are strings of integers for some reason (using a JSON dictionary for instance) and get the values out of it directly with integers. No need to add an extra step to convert to strings, just use an f-string! Example: >>> mydict = {'0': 30, '1': 12, '2': 6, '3': 11, '4': 20} # using strings as keys >>> [mydict[f'{i}'] for i in range(4)] # list comprehension to retrieve values in dictionary based on integer >>> [30, 12, 6, 11] # list of values retrieved Hopefully someone will find that useful... or at least somewhat interesting :).

@dominikmoos4814 5 років тому

Sébastien Lavoie wouldn‘t it be easier to use str(i) ?

@slavoie 5 років тому

Dominik Moos it is in fact easier to read, but on my machine I can confirm that it is 30% faster to proceed with f-strings using the following test in a terminal: python -m timeit -s "mydict = {'0': 30, '1': 12, '2': 6, '3': 11, '4': 20}" "[mydict[str(i)] for i in range(4)]" → 200000 loops, best of 5: 1.7 usec per loop python -m timeit -s "mydict = {'0': 30, '1': 12, '2': 6, '3': 11, '4': 20}" "[mydict[f'{i}'] for i in range(4)]" → 200000 loops, best of 5: 1.18 usec per loop As to the reason why this is, I only know f-strings are evaluated at run time but I would be interested to learn more about this! For the time being, I will keep on using f-strings because they are awesome and they save at least two keystrokes every time ;) [str() vs f'']...

@dominikmoos4814 5 років тому

I agree f-strings are awesome and thanks for the detailed answer!

@valentinkhomuteno6825 5 років тому

You don't want to go with this solution if you care about perfomance. list(mydict.values()) works well and also much faster than hand-written code. import time large_dict = {f'{i}':i*2 for i in range(10**6)} start = time.time() values = [large_dict[f'{i}'] for i in range(10**6)] end = time.time() print(f'done in {end-start}') start = time.time() values = list(large_dict.values()) end = time.time() print(f'done in {end-start}') >> done in 0.48581695556640625 >> done in 0.027498245239257812

@slavoie 5 років тому

Валентин Хомутенко thank you! That's very good to know!

@dylancooley9722 3 роки тому

You have been a God send with this python playlist! Thank you so much, man.

@lucasflores1 3 роки тому

your english is clear, your teaching skills are amazing. Thanks!

@SACHIN-gd6zy 5 років тому

Hey Buddy ur videos are of top quality

@KakaTu272 2 роки тому

Helpful video , easy and to the point . Thanks mate

@sampanicker4725 4 роки тому

this video was very helpful. Thanks Corey!!

@parthibanspace 5 років тому

Keep doing this good work Corey! Thanks much.

@srikanth007spl 5 років тому

Such a delightful feature! Thanks Corey.

@itsoktobewhite6377 Рік тому

You're killing it dude! 👍

@sladefx2955 2 роки тому

Learned a lot and the video is really well structured aswell. Thank you

@georgevarelas5073 5 років тому

The F-Strings are very useful. Thank you for this high quality video!!!

@andrealopez9556 3 роки тому

Thank you so much! You explain it so much better than my teachers.

@jingyuchang1885 5 років тому

Very informative video! Thanks Corey!

@denniskamonde6836 5 років тому

Thanks Corey Best tutorials Ever

@monagulapa3022 4 роки тому

Truly a Pro ! 👏👍

@timandrew4515 2 роки тому

much helpful! thank you!

@nonalcoho 3 роки тому

Thank you for your kind tutorial! I learn so much

@salkdjfasldkfjsdlk 5 років тому

Great tutorial as always.

@luizfernandes7104 Рік тому

Very helpful and straight forward!

@kelue3784 5 років тому

I am in Shanghai, China. Watching your video is very helpful. I am very interesting about Python.

@jaysanprogramming6818 5 років тому

Good job! Again... Amazing!

@billstrum3203 3 роки тому

Good job Corey!!

@huntermaverick5114 5 років тому

Hi Corey. Great video as always. Can you make more videos about "Real World Example" like the one before? I really like this kind of video and I think they help us understand more of what we can actually do with Python. Thanks

@garydunken7934 5 років тому

Well planned tutorial with good examples. Thanks.

@JAYS040787 2 роки тому

Very helpful. Thank you

@RonaldModesitt 3 роки тому

Very helpful. Many thanks.

@kennethstephani692 Рік тому

Great video, Corey!

@akira_asahi Рік тому

Thank you for the video. I am gratuful for your time and contribution. Kind regards, Akira.

@DreamwebMarocasa 4 роки тому

Thanks for sharing your knowlidge, Great stuff, very useful.

@AdamSmith-ux5if 5 років тому

Love f-strings! Thx for another great video Corey :)

@WisomofHal 4 роки тому

I was introduced to f-strings today in John Zelle's Intro to Computer Science: Python Programming book, which is very good and has taught me the Python I know, so far. I wasn't grasping the concept as quickly as I expected from the book, which has been the only thing I haven't been able to grasp within a few days so I came here to your channel. This makes f-strings look so sexy. Thanks a lot!

@jonathanwarner2420 5 років тому

Well done, mate. Thx.

@sep69 5 років тому

This sure is a handy feature. Thanks for the video :)

@mustinjiles8275 10 місяців тому

Thank you so much!

@novicetech1 5 років тому

Awesome as always.

@x-Machina 2 роки тому

This was great 👍🏻

@nazaserh 3 роки тому

Great lesson 👍

@impossibleisnothing9197 5 років тому

Thank you for the video!

@arjunbarakoti4757 11 місяців тому

awesome , expecting more and more in python .

@SwinginBluesTube 3 роки тому

your videos are really good. Thank you.

@tonglai7499 4 роки тому

Corey Schafer in string format video: " String formatting allows us to display exactly the way we would like it" Me: Yes I love string formatting! Corey Schafer Fstring:"This is not elegant or intuitive" Me: bye string formatting

@khitesh04 5 років тому

Cool will solve some of my formating issues thanks bud

@MM-oq1lb 7 місяців тому

Can you upload a link to your previous video you mentioned in the beginning of this video?

@NathanY0ung 5 років тому

already knew most of these except for the datetime one though, thanks :)

@GarimaJain 5 років тому

Thank you!

@saiganesh4361 2 роки тому

Nice info corey

@guilhermehx7159 5 років тому

Thanks Corey

@akbarahmadi8175 4 роки тому

great work

@kychemclass5850 Рік тому

Thank you! :)

@prateeksarangi9187 2 роки тому

Thanks again

@WindowzXp 4 роки тому

Saved me a headache. thank you.

@glutzm 5 років тому

Awesome content!

@gauravtiwari6392 3 роки тому

Hey Corey, nice video you have there. I had a question though(I don't know whether it concerns with this video), I needed some explanation with the dunder method __format__(). How is it used? Can you provide some examples it would be great. Thanks for this video.

@claytonberger 5 років тому

You are absolutely awesome!

@riddhiprajapati9948 5 років тому

Not only your video, You are amazing too.

@walber026 5 років тому

Great one!

@noobinvestor3180 5 років тому

Precise,informative and exact..how do you do this Corey?

@eclypsed 4 роки тому

AthulRaj Puthalath not even close... a lot of misinformation. .format() can use named placeholders and you can do functions when loading data in.

@rajveersingh2056 4 роки тому

@@eclypsed you would have to use dot format function use every placeholder as a parameter. I think f string are way more compact than the format function

@sharky2606 4 роки тому

he reads the documentation, and then makes these videos for people like me that are too lazy to read it and figure it out for themselves

@amritdora9960 3 роки тому

good job!!!!

@user-mi8lq9zv7r 5 місяців тому

sweet swizzle bro. I am beginner python_man and run into some squat.BS and besides skipping through it I use power of UKposts and notice I gravitate towards your content more of ten than not. Time for burrito and beers brudda

@gingercholo 4 роки тому

holy crap, you are awesome subbed!

@jongcheulkim7284 2 роки тому

Thank you.

@randomguy75 5 років тому

Thanks man. it would great if u made some videos about the new features in Python 3.6 and 3.7.

@jinqimao4781 4 роки тому

Thanks!!!

@Hello-iq5ux 3 роки тому

great video!

@maxvinella941 5 років тому

Excellent!

@dwaynerobare1153 3 роки тому

I am a beginner... Really love your videos, the info and your approach to teaching. Please slow down your speaking a bit. Thanks again!

@iamparadox8885 5 років тому

Sir you are amazing

@menghuajiang4314 2 роки тому

Easy to understand even as a newbie.

@thelurkingpanda3605 4 роки тому

You're a godsend

@chittipolinaidu1897 4 роки тому

excellent dear

@tamilstalin4609 5 років тому

Thankd bro

@davinderbhatia2573 5 років тому

sir your videos are greatest source! please can you make a video on url shortner in python . it would be really helpful. Thanks in advance

@maudentable 5 років тому

amazing stuff

@hanes2 5 років тому

Do you have tutorials on how to manage localisation in python? I only know the Qt way with using their own software

@susmitamazumder8390 4 роки тому

Hi Corey one of your video I have seen you comment out multiple lines at a single time. How did you do it from the keyboard? Sorry I could not remember which video it was though.

@francescowang 3 роки тому

Legend!!! Thank you. How do you comment and uncomment out using #?

@leenukes7418 5 років тому

Thanks dude ;-)

@abhisheksharma-ib5vw 5 років тому

Nobody can beat you...only You, yourself can beat u... Incredible video

@thattoofunny 5 років тому

You Rock.....

@jianwenwu6948 5 років тому

Best video ever

@dwaynebinns3766 2 роки тому

Corey 4really love your vids. I am new to.pyyhon and is a self thought person. I am having a hard time adding a line of values with the $ . I want to keep the $ as formatted.

@emmanuelchikeluba2360 4 місяці тому

I understand what you mean by the syntax error that emanates from the wrong use of quotes, however, I used single quotes throughout in mine for the same example and it was perfectly printed on the terminal window without an error message.