5 Useful F-String Tricks In Python

Here are my top 5 most useful f-string formatting tricks that I use everyday in Python.
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[@chyldstudios]

the "=" trick in the f-string is fire.

[@m-zurowski]

It made my day - I'm gonna test run it in a loop with some random dictionary to see how many cool tricks it can do (like reading current settings) :)

[@m-zurowski]

ok, my idea didn't work as expected 😅

[@dark_brownie]

Yeah, completely agree it is amazing

[@sunwukong6268]

Ever since I learned f-strings...I love them.

[@GentleMannOfHats]

I wish I had known sooner!!

[@rickymort135]

And I love you.... Sorry if I made things awkward... 😬 Oof this awkward isn't it?

[@andymitchell2146]

I've been using python for about 10 years, and f strings extensively, but never knew that last tip! Game changer!

[@yash1152]

well, thats cause its only a very recent one (afaik)

[@eyehear10]

@@yash1152it was introduced in 3.8, so a while back

[@Zenivo]

About the fourth trick: the f in ".2f" tells it to format as float. You can also do for example ".2e"" which will format the number in scientific format.

[@_Loki__Odinson_]

This is the first time I have seen someone specify datatype for variables in python, and I honestly loved it. Great tips btw.

[@Indently]

That's the hype for type annotations that I love to see!

[@Naej7]

Not using type annotations should be banned by law

[@_Loki__Odinson_]

@Naej7 I don't think so, many people choose Python for its simplicity, with the absence of type annotations being one of the key factors. Removing this feature might deter beginners from trying it out. However, as you become more proficient in programming, you may choose to utilize type annotations or when exploring other languages.

[@Naej7]

@@_Loki__Odinson_ Type Annotations help a lot, and if adding 5 characters (: int) is too hard at the beginning, then one should give up on programming lmao

[@edwardcullen1739]

​@@Naej7 Except people don't understand how to use them, so you end up with unnecessarily hard to use APIs. If that's how you feel, why not just use C? 🤦‍♂️

[@utarasama]

The last one is super duper cool!

[@dcx45]

RIP the maintainer

[@utarasama]

​@@dcx45 he should then watch this video

[@BohumirZamecnik]

Very nice. Another useful is formatting float as percent: f"{foo:.2%}".

[@TheJaguar1983]

Didn't know about the date/time and equals formatting. Looks like the first one forwards to strftime. Makes things so much more concise and readable.

[@krzysiekkrzysiek9059]

This kind of tips are awesone. We need more 👍

[@rolandsz8831]

Great video! I missed the bonus tip where you explain that format string calls __format__ on the object being formatted, so you can do your own formatting, like this: class MyData: def __init__(self, a: int, b: int, c: int): self.a = a self.b = b self.c = c def __format__(self, spec): if spec[0] not in self.__dict__: sep = spec[0] l = list(spec[1:]) else: sep = ',' l = list(spec) return sep.join(str(self.__dict__[key]) for key in l) my_var = MyData(a=1, b=2, c=3) assert f"{my_var:cba}" == "3,2,1" assert f"{my_var:-abc}" == "1-2-3"

[@TheMcSebi]

Great video! Didn't know about the datetime and debug print ones. Definitely going to use them in the future, though.

[@jaa928]

Thank you for the instructive tips!

[@quekki3666]

i love f strings also this is like the 3rd time i come across the = specifier but i keep forgetting its existence and type in the whole thing

[@Indently]

It's a cool trick for sure!

[@bashar9200]

This is amazing!! thank you for this tutorial!!

[@richsadowsky8580]

Absolutely fantastic and useful video!

[@dipeshsamrawat7957]

Nice collection! 💯

[@SergioYT2052]

"Simple y bello como un anillo", como diría Neruda; pero además, muy funcional. ¡Muchas gracias!

[@mattshu]

F strings are soo chef kiss

[@timegor844]

Wow, so many simple things I didn't about... Thank you

[@kychemclass5850]

Love #5. Thank you.

[@flashtrack101]

Love your vids man! would love to see a tutorial on cython from you!

[@viniciomonge3960]

Loved the last trick!!!

[@UndyingEDM]

For those who didn't know, the last one is called self-documenting expression and was released in Python 3.8

[@Pawlo370]

Finaly! All fstring variations in one film

[@mjhaynavarro]

So cool.. thanks for sharing it. very informative

[@ChrisHalden007]

Great video. Thanks

[@griffgruff1]

Great video!

[@rahulCoding]

Great video.... Thanks a lot😍👍

[@catastrophicblues13]

That last one is sooo useful!

[@karthikkarthik100]

Last trick was super cool...

[@cmcdougle]

Thank you, this went STRAIGHT into my current project. Commas in numbers was one of the next things I was going to look up.

[@MahdiImeni]

Loved it ❤

[@Anzeljaeg]

This is pure gold 🥇

[@TheKahunas2722000]

Love the video I knew some of those but the last one is epic I will be using that from now on .

[@sidjay7644]

Very nice Thanks

[@swolekhine]

These will be useful to me for sure. Here's a comment for the algorithm gods!

[@alisajjad2478]

Thanks for the tips. The last trick is amazing

[@SaveCount-bh8tp]

Thanks very much

[@mrjamesflores]

The last one was good!

[@Angelinajolieshorts]

Great work sir❤

[@LittleGnawer]

Nice and useful tricks for every day programming. I also prefer specifying types of variables, since it makes code better understandable.

[@dark-ghost4132]

Thank for nice tricks 😘

[@artistpw]

Very nice.

[@kinngrimm]

thanks for the showcases

[@cheesy_boya]

Yep, I'm saving this video

[@tolgaflashtr2855]

too* 😂😂

[@Krullfath]

This is super cool, I sadly can't think of any usecases in my current project

[@adeptusmortem]

Thank you

[@Little-bird-told-me]

Good Job

[@Sailesh_Bhoite]

Nice Tricks!

[@mad_vegan]

To use scientific notation with integers, you can either do int(2e9) or 2*10**9.

[@aliwalil4160]

the last fstring was dope

[@aguy9836]

nice examples

[@ErLakhan]

Superb

[@oldschoolsoldier1634]

Trick #2 is neat

[@daveys]

I like that print(f’{a + b = }’) one at the end. I can think of a few times when I’d use that.

[@Indently]

Earlier I didn't know it worked on whole expressions, I think it's super cool as well!

[@Andrey_Fedorov]

Круто! Спасибо!

[@chrisogonas]

Awesome! I love the '=' and >

[@yash1152]

i knew last one already, but seeing it again made me realise i should try to do this in java too, would have shortened a whole lot of cruft in one program i made.

[@MechanicusOfficial]

I always use pyformat. Very easy to understand and pretty nice too. Var = 15 print(“this is my var: {}”.format(var))

[@richardnicholas2957]

Gold!

[@noir66146]

ooh i like these videos logic magic !

[@gopal.]

thanks

[@Al_Miqdad_]

thanks for your time please make videos about data structure

[@GW-nh9qc]

Klasse 😃👍

[@meghanelizondo774]

I was so stoked when f'{ var = }' was added to Python!! Might be abusing it a bit lol

[@-george-1153]

You're cool! 👍

[@Mor3Lif3]

That last one goes wild

[@casperghst42]

Intersting, a large part of the world is using . (period) as a 1000 separator and , (comma) as a decimal point.

[@kinngrimm]

Does datetime have a formating depending on nation? Like we would have already through a login or a whois access to a users current or defined whereabouts or nationality and we would want to have their specific way of reading time provided for them.

[@user-hd3pz2ow1b]

rounding in python .. cool

[@NickCombs]

This definitely seems more convenient than it is in js.

[@semenivanoff8615]

Useful. Thanks

[@sayantanguha1934]

The last one blew my mind

[@murphygreen8484]

Don't forget in newer python you can add multiple lines of text by stringing together f strings

[@archiemarqx]

3:24 this tip will literally improve my code quality

[@fg786]

What can you do with print(f'{var: >+{x}}') ? The additional + get's printed in front of var but a - doesn't, you can put a # instead of the + and it's not throwing an error, yet doesn't seem to do anything. Letters and other symbols give an error.

[@Lord2225]

Fact: You can define custom logic for f'string on your classes and get string after : as argument to __format__

[@kinngrimm]

9:30 that approach though had the single quotation marks removed, which from a formating pov is cleaner, isn't there a version of the first shorter approach without the quotation marks then printed? (edit: while still being flexible in terms of variable names as mentioned)

[@0MVR_0]

the thumbnail to this video inspired an idea to use format strings in dictionaries so that a dynamic series of texts can undergo a linear list of mutations. Honestly, I actually need to refine my idea though.

[@NC700xLover]

Which editor is that? Looks fresh

[@brycesakal3717]

My professor who I took intro to Python called the “” ‘right justify and left justify’

[@acherongoon]

My preference is th .format(...) method fo a couple o reasons. I use Micropython a lot and f""" is not or has not been available, for format supports all the styles I like. i8n the string being formatted is not known at development time. Scope, the names using inside the string can be assigned at use time, i.e. in a function the value may be in a variable gmt_time but the string uses a standard name 'time'.

[@xKiiyoshiix]

Hello @Indently, Can you please explain me, why you use ":" after a variable for ex. n:? Regards.

[@matthewbay1978]

It allows him to specify what type of variable it is. "n: int = " tells anyone reading that it's an integer. I'm glad you asked that though, because I'm an amateur and I'm curious, @Indently is that common practice?

[@veeratheking8375]

big fan bro from india

[@Indently]

Thanks!

[@iscatafan2959]

You make the code easier to read, so you better use the functions of the str class! 🐳

[@anon_y_mousse]

I wish more languages would copy this feature, and that Python would allow you to use variables inside the strings to select formatting options. For my own language, I made all strings f-strings and just have a shorthand where "$var" will stringify the value of `var`, and "${ expr }" will stringify the value of any valid expression. I made it so that format specifiers could use a variable instead of a numeric constant in the string. That way you could pad the output to the terminal dependent on the actual terminal attributes without using a loop. I'm hoping that this methodology negates the need for *printf() functions in my language, because separating the variable from any formatting options on it is error prone, and most of the time people just want to print as is.

[@annieshedden1245]

i'm old but i still think everyone should know that most of the f-string stuff comes from C printf/strftime/etc.

[@rutenowynidoking3593]

For debugging, I recommend the "Icecream" library.

[@tudaer]

May I ask which IDE and development env are you using? Looks so great

[@meowsqueak]

It’s PyCharm

[@tudaer]

@@meowsqueak thanks!

[@eugenepark]

Is it possible to combine f"{n:,}" and f"{n:20}" somehow? or are they an exclusive or

[@MkReman]

Which code editor do you use? It appears to be pycharm. But the ui is different from what I have in windows laptop.

[@meowsqueak]

It’s the new UI. Perhaps you’re still using the legacy UI?

[@Carberra]

That last tip is the biggest argument against a debugger; if they wanted you to use it, why did they provide that debug syntax? 🤓

[@Alchemist10241]

1e9 was the most useful to me

[@hlubradio2318]

Wow

[@kamurashev]

Yep, f string is a great feature. At least something Python gives us 😅

[@VypeReaper]

Apart from learning about the f condition, I also learned you can declare the data type in python which i have not been doing lol

[@shabadooshabadoo4918]

i dont really know anything about programming or python but im curious. when you do "var:" is the colon part of the variable name? or a requirement for specifying a variable name? if its part of its name, is it to differentiate it from something else?

[@AnonHooman]

The colon after a variable name is for typing the variable, for example: my_var: str = ‘Hello’ We’re saying that my_var is of type str (string) and has the value ‘Hello’. However, the typing is not necessary and my_var = ‘Hello’ would work just as well. Though, most people would recommend to use type hints

[@PanduPoluan]

@@AnonHooman Well if assigning simple, easy-to-infer data for a variable, I usually do away with type-hinting. Type-hinting is a godsend to mark parameters to a function, preventing hard to trace ValueError or TypeError exceptions later on. I usually don't type hints my variables except when I'm doing unpacking.

[@ArtyomKatsap]

Hi! Thanks! Great video! Worth mentioning that the last one does not work on older versions of python3 (I tried it on 3.7.17 and it gives a syntax error).

[@UndyingEDM]

Probably added in a later version. I'd love to know which. Edit: it's called self-documenting expression released in Python 3.8

[@jameswise9171]

So much better than Rust's format! macro

[@andrewmalani1882]

what complier/interpreter does he use?