F-Strings Have A Lot of Format Modifiers You Don't Know
ฝัง
- เผยแพร่เมื่อ 15 มิ.ย. 2024
- Today we learn about all the different F-String format modifiers in Python.
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Another thing worth mentining is that you can define your own custom formatting rules for your classes by implementing the ___format___ method.
thats fkn sick i never knew that till now
Note: TH-cam has a feature that when you surround text with underscores it becomes italic, so the name of the method in OP's comment appears to have only one underscore on each side instead of double underscores
@@capsey_ Thanks, didn't know that. Edited to have three underscores now :)
It's import to realise that you don't just use f-strings for printing, sometimes they are great for converting data from one format to another. If you use the bin() function to convert a number (n) into a binary string, it adds a '0b' prefix, which you may then need to remove using slicing. You could just use f'n:b' to do the same thing, or for example, if you use f'n:032b' you get a 32-bit binary string with all the leading zeroes included! Much simpler than writing some code to do the same thing.
Very useful. Those IC.enanle and disable were amazing for verbose functions and argparse. Tysm
Great tutorial as usual - very useful tips for formatting.
Great! Are you planning to make a second edition of the Python Bible book? It's been 2 years since the first edition published, can't wait for continuation!
Everytime I have a question about python I end up at your channel. Your videos are very informative and great to learn from!
PS: How is the song called in your intro?
Awesome!!! Very useful. Thanx a lot
great to know this stuff. thank you.
Nice! 2:16
thank you, py mentor.
Hello there! In 11:10, I'd like to do something like this:
day = 7
month = 6
year = 2023
MAX_DAYS = 31
MAX_MONTHS = 12
print(f"{day:len(MAX_DAYS)}.{month:len(MAX_MONTHS)}.{year}")
Also, if we wanted to have the binary in 11:40 like 0100_1001 etc and not 100_1001 etc. Like add the last 0 when cutting it in bits of 4 or 8, how could we do that?
Very useful :-)
what key stroke did he use at 10:13 to delete every in the format string?
_amazing_
when you did dollar values how did it know to separate after 3 digits? Is that default behavior?
use grouping=True on the locale. Currency(value, grouping=True)
@@BokoMoko65 ty
Hey, when will you talk about the real company Cannafarm Ltd that brings profit?
Why dont you use python 3.11?
Do Little work on intro❤❤❤
the first thing, you are good when explain python. And the second thing, i like, because you use pycharm and not VS Code, of microsoft.
Never, i will use ide of microsoft in my linux
Not a function, not a class (same 'str'), just a dirty hacks that looks like 'salty syntax'. Maybe all show go write simple, readable code instead?
To the moon with Cannafarm Ltd!
First!
so what ?
second!
When I think back on all the time I wasted trying to do this stuff manually or just ignoring the ugly non formatting... 🤔😲🤯
This kinda highlights one of my biggest complaints in the whole world of programming. The sheer amount of minutia and details to memorize is overwhelming at times. It gets worse the more languages you accumulate. Everyone seems to have their own nomenclature and semantics. "MATCH case not SWITCH case which was something we were all used to BEFORE, thank you very MUCH! " Sometimes the function you want is right under your nose but you lack the nomenclature to know what your looking for.
On the other hand even once you DO find that weirdly specific thing in the obscure library, often you wind up having to immerse yourself in Vogon poetry (Little 'Hitchhiker's Guide' reference there.. ) in order to use it. APIs are not always intuitively written, or have any reasonable docs (and usually tons more obscure minutia to memorize).
THEN we get into the whole issue of licensing. Just a cluster#$^@. "Free for use.. On alternate Tuesdays IF you have a counter-signature from the Burgermeister of Sonoma."
Sometimes just our limited capacities to completely grok the capabilities of a full language suite is the smallest bottleneck to creativity.
Anyways, enough soapbox.
I prostrate myself before thee Shifu! "May the luck of the 7 pillars of Gulu smile upon you at all times."
🙇♂👍
Hi,
Why this doesn't work?
import locale
import datetime
current = datetime.datetime.now()
locale.setlocale(locale.LC_NUMERIC, 'fr_CA.utf-8')
print(f'current = {current:n}')
Displays:
current = n
NO ERROR
Python 3.11.4
When asking for help it's generally a good idea to include the error that you're getting.
Works fine for me
@@phsopher I updated the code, no error.
What you have displayed?
@@v11r 'n' is used for formatting numbers not dates (thousand separators, decimal point). I assumed current was a number since you didn't have it defined in the original comment.
Found solution:
import datetime
from babel.dates import format_date, format_datetime, format_time
print(format_datetime(datetime.datetime.now(), locale='fr_CA.utf-8'))
Displays:
19 sept. 2023, 15 h 34 min 30 s
@@v11r Great! That's another library that implements its own formatting function though so it's not something built into F-strings. If you want the functionality you had in your original comment you can extend datetime by implementing your own __format__ method which uses babel and returns the format you want.
Locale that you used is not working for me.
locale.setlocale(locale.LC_NUMERIC, locale: 'pl_PL.utf-8')
^
SyntaxError: invalid syntax