Finally...Someone gives an informative lecture/demo on Python's logging engine. This was excellent and would have saved me a bit of time and confusion a couple of years ago. I use a separate "logger" for each module for large apps. This way I know what module (and in many cases the class and/or function) that generated the message. The only problem with this type of logging is that the module level logger (by definition) is a "global" variable. Recently I implemented a color-coded console-only logger also. Once you understand the various "logging" components (handler, formatter, name) it's really not that hard to do. Excellent Video !
@afonsosalbrecht Жыл бұрын
seriously?? that's a copy and pasted video from corey schafer
@danub55512 жыл бұрын
I was *literally* just searching about logging in python for a project yesterday... just in time Tim 👍
@jakes-dev13372 жыл бұрын
I swear he has us figured out
@alonso94222 жыл бұрын
X2
@slater-cguy2 жыл бұрын
Same!
@mccdan666 Жыл бұрын
OK, now I understand why you have 1.1M subscribers: exceptional content delivered exceptionally well. First time seeing your content, instant subscriber. Keep up the good work.
@BrandonJacobson2 жыл бұрын
I haven't really bridged the gap into intermediate level projects yet. I've used logging a couple of times before, but I can def see how it would be more useful in larger, more mature, programs. Thanks for the video!
@johnnyz12062 жыл бұрын
By the way, log.log is unchanged not because you are not using it but because you overwrite it with the same log text. All log comes from a logger eventually goes to its parent logger (in this case: root logger).And if you don’t want this behavior, you need to set logger.propagate = False.
@ShivamPatel-yg3kd2 жыл бұрын
Thank you so much, I was literally facing this issue... Thank you, infact in this video the log.log has got updated indeed
@KarthikKumaresan-k1o9 ай бұрын
@@ShivamPatel-yg3kd Thank you so much
@jurajlk90192 жыл бұрын
Dont use f-string when logging. Because, if you use logger.debug("text %s", variable), the text formating will only happen, if the debug level is active. If you use f-string, the string will be formated, even before it is decided wether the msg will be logged, thus losing performance
@Anequit2 жыл бұрын
Can you post benchmarks of the performance loss?
@jdhoehler Жыл бұрын
Was about to comment the same thing. Such a minor point but is considered best practice.
@ExDarkx35 ай бұрын
@@Anequit they can't, because it depends on what you are evaluating in the fstring. But given that this is a debug level statement, it shouldn't be too expensive. I personally wouldn't sacrifice the readability and still use fstrings tho.
@goose_clues5 ай бұрын
If you care about performance, why not use other languages 😂 Seriously, python is a flexible and high readability language with reasonable performance. Why do you need to sacrifice a readability? Are you throwing a fuckin Ackermann function to fstring?
@goldeer71292 ай бұрын
seems the small gain in performance is absolutely not worth the readibility you may lose so ok but mostly doesn't matter
@BryanJenks2 жыл бұрын
Loguru is my go-to logging module, makes it sooooo easy to define custom levels, multiple logging sinks, and i just parse the data into a logging SQL Server table and it is GLORIOUS
@ifthennotagain51952 жыл бұрын
I've been following you since under 100k subscribers... somehow you consistently produce content that aligns with what I am in the process of learning. Thank you! (I'm a former gryphon too!)
@krishnans20062 жыл бұрын
Amazing video! I'd like to add, however, that most linters recommend using the 'args' of the logging levels to embed variables. For example: logging.info(f"the value of x is {x}") -> wrong logging.info("the value of x is %d" % x) -> wrong logging.info("the value of x is %d", x) -> correct approach Do note that all three ways shown above do work - it's just that the third method is recommended for use.
@GabrielAcosta002 жыл бұрын
I come to comment on this +1
@dimond82702 жыл бұрын
can i ask why? ive never heard of a correct way of formatting strings?
@lawrencedoliveiro91042 жыл бұрын
The second version is fine, too. Note that the docs state that no formatting substitution is done on the message string if no formatting arguments are supplied. Compare, say, printf(3), which always does formatting substitution even when it doesn’t make sense. Python is a bit smarter.
@moondevonyt2 жыл бұрын
no joke, i was just looking for a logging in python video. thanks a lot Tim ❤️
@JakobJensen-y3d7 ай бұрын
I do miss one thing though; this video shows how to use logging in one file, but what I think most people are having an issue with is multiple loggers. An idea for a "logging -part 2" could be, how do we use (different) loggers across a module? In the video above there's not really a reason to use "logger", you can use "logging" directly thus I think it would really be great to have an example where (and how) you would use various loggers
@davecapstick81297 ай бұрын
thanks for this, you have explained logging in a really simple and straightforward manner. You have probably saved me a lot of effort in trawling through documentation. Much appreciated
@deveshgolwalkar36054 ай бұрын
short & crisp explanation. Perfect!
@ayupitsali6082 жыл бұрын
Cheers Tim! Another Python skill in the bag!
@ABEL-cd2sp2 жыл бұрын
Listen i won't say that i intended to use print as my main debugging tool but it just naturally happened because i didn't realize that debugging already did most of the work for you, heck at first i didn't even really know what debugging was. Great tutorial however I'll end up using it quite a bit in the long term and it saves me some work so nice.
@khazartalibov90482 жыл бұрын
Nice.We would glad to see about Golang (logging, unit testing and other advanced topics )
@mikez7622 жыл бұрын
i have been debugging all day with those print's. thanks for another way
@Earnest1G2 жыл бұрын
Amazing channel. Has helped me so much when studying to become a software developer. Amazing work really!
@enzanto2 жыл бұрын
lol, reading all the comments about people searching for logging and praising your video, like it came out the same day they commented.. then i realized the video came out 24 hrs ago, and i too searched for logging the same day the video came out xD
@astronemir2 жыл бұрын
Very valuable and time saving tutorial. Thanks. Fixed up my logging implementation
@gskluzacek2 жыл бұрын
Tim, as a couple other people have pointed out in the comments, but it bares repeating, you should never use f-strings, simple concatenation or .format when logging messages. Instead, you should use %s or similar in the log message as a placeholder, and then pass the variable that you want to merge into the message as an argument to the logging method. For example: in_val = 105 logging.info(“Tip amount entered: %s, exceeds 100 percent”, in_val) This way, the system doesn’t have to do the extra work of formatting the log message, if for example the log level is set to error. When you pass the variable as an argument to the logging function this way, the system will defer the formatting of the message until it absolutely knows that the log message is going to be output.
@hemashankartalupuri612111 ай бұрын
best thing that i found today about logging-python
@nikolakhs2 жыл бұрын
For real this video what at the perfect time, last night i was searching for that and i understood nothing until this time i saw this video . Thanks
@BummerSlug2 жыл бұрын
Crazy useful! I am done with print statements now, thank you!!
@vivekan972 жыл бұрын
Hey Tim ! great content as always. can you do tutorial on how to write unit test for Flask applications ?
@nahakuu2 жыл бұрын
I have noticed, when using the logging.exception() call it adds the exc_info on end of the preformated text. This is problem as I created the format to be Json and this exc_info is always put outside of the JSON which breaks the format. Can I somehow use the logging formatting to store this exc_info in my json format? I tried to use exc_info but that spits out multiple lines, like text what I can see on screen when error occurs. But I want just the Traceback what is return in function logging.exception(), as there it seems to be always the exact point of failure rather then all the dependencies what I have no power over. Thank you
@teclote5 ай бұрын
Outstanding, works great first time, lots of good ideas.
@moumniable2 жыл бұрын
Perfect timing ! Thanks 😀
@thomasbates9189 Жыл бұрын
Very helpful! Thank you!
@BombasticTom4922 жыл бұрын
legend finally made it
@eapenjiss79452 жыл бұрын
Is it possible to give a short description of the log file at the beginning of each log file, whenever it is created?
@siddheshnaik4956 Жыл бұрын
Thanks a lot , very informative !!
@mosa362 жыл бұрын
Could we get more information on db handler? I'd love to learn how to use it :)
@MichaelVash78862 жыл бұрын
Got a list of scripts that I need to turn logging on for. Need to add some logging functions to class object I have made for it
@keeslauwers68242 жыл бұрын
do you read my mind I am dealing with an error for the last 3 day and I print to debug print("this is painful")
@gugugaga58672 жыл бұрын
Hey Tim when are you going to open startup?
@Azsha06802 жыл бұрын
Hi, nice content ! thx a lot ! starting in Python and your video really help. I'm just wondering about your interface. I saw you use PyCharm in your other video and i'm use to the 'VBA' type of interface. What are you using now and what do you suggest using. Thx in advance !
@ParaSteve19852 жыл бұрын
Everything i needed in just 15 Minutes! Perfect
@NishantCosmos2 жыл бұрын
i'm new to debugging professionally, idk why to do logging
@backdoorguy1Ай бұрын
Is there any append mode instead of overwrite mode for logging?? I want to store my logs of a service in an S3 bucket
@user-cc8kb2 жыл бұрын
Great tutorial! Thanks :)
@skarface59782 жыл бұрын
Hello, I'm new to programming and I don't know anything about it. I would like to know what you recommend
@haroldabella20412 жыл бұрын
What if an existing value exists on the logger? Is it going to skip logging the existing value or will it add the same value?
@Lunolux2 жыл бұрын
finnaly found, why the "X" user can"t launch my script => it's because this user has not some library installed this logging think is very useful thx man.
@secretions29912 жыл бұрын
It's so perfect timing
@oneh0urtrades9 ай бұрын
thank you it was a helpful video
@Richard_GIS2 жыл бұрын
Didn't know about the exception thing
@nanayaw71592 жыл бұрын
Great tutorial
@shreyb1409 Жыл бұрын
my test.log file was empty till the time i did not add the logging.basicConfig, can someone explain why?
@amrithpurandhar98822 жыл бұрын
DSA chapter is it covered in programming expert ?
@adityaalmighty12 жыл бұрын
Hi! Any idea when is Kite going to be up?
@gbesiu2 жыл бұрын
Could you do something about linear programming please?
@BeigeAlertHamburg2 жыл бұрын
Logging in FastAPI gives me headaches. Dublicate lines, and no rollover in Windows.
@ImYala2 жыл бұрын
Hey Tim.. I have been learning react and django to make full stack web applications. Do you have any suggestions on what to do when you get stuck and can't seem to find the solution with google?
@avnerduchovni6675 Жыл бұрын
Thanks for the good content
@mikelancaster89242 жыл бұрын
Thanks so much!
@salimzavedkarim2302 жыл бұрын
You're the man!
@realityveil61512 жыл бұрын
Sure, the logger is cool, but print isn't going to make my script reach out to a remote LDAP server and execute arbitrary code. So I think I'll just keep using print.
@FMH2012 жыл бұрын
Thank you for the video. I really hope you would get rid of the background music.
@timwebster852 жыл бұрын
Epic! thanks
@noufalkaku2 жыл бұрын
Hi Tim, may I know the autocomplete package your are using?
@CodeNight-dm2hv2 жыл бұрын
I was looking to put a logging system in my app today! How did you know?
@fabian_ftn66042 жыл бұрын
Up
@SomeoneRandom-f9o2 жыл бұрын
Very useful 👍☺️
@vanoelizbarashvili66552 жыл бұрын
very useful thanks
@ArgumentumAdHominem2 жыл бұрын
I've never encountered the need to use a logger in 1 person projects, no matter large or small. However, if you are working as a team, having a common standard for logging is extremely useful
@JohnintheDesert2 жыл бұрын
What is your favorite IDE?
@Lunolux2 жыл бұрын
doesn't know about that, i was creating my "own log file" ^^" for my little python programmation this gonna maybe help me, to know whatt the name of the user my script are lauch thx
@夜神月-l8q2 жыл бұрын
What do u use as sublime theme and colour scheme 🌚
@PGhai Жыл бұрын
how do you log in file as well as on screen ?
@gzbin3652 жыл бұрын
really useful
@dimitriosdesmos46992 жыл бұрын
The greatest problem I face as a programmer is not ERRORs, ..it is erroneous results. ..and for that the LOGGING module is not helpful.....you need to trace every step of the program ...Errors are not hard to find....getting a 5, instead of a 55 though....can take you 2 days to figure out sometimes...because there is no real error associated with it. Thats what takes time , not things like 1/0...or adding strings to integers.
@jonk-r73522 жыл бұрын
What ide?
@armkreuz822 жыл бұрын
Damm, I just spent the last 2 days builing my logger template for work.
@trollingspecialist5542 жыл бұрын
thank you thank you thank you
@lawrencedoliveiro91042 жыл бұрын
The logging module just gives you more control over message output, that’s all. If you use sys.stderr.write, then you have to do your own implementation of verbosity levels, for example. The standard Python module has already pre-invented this whole wheel (and much else besides), so you don’t have to.
@jeff_tech2 жыл бұрын
Nice Video! The music was a little bit too loud tho
@waqaspathan33372 жыл бұрын
i didnt even realize music was playing til you pointed it out
@jeff_tech2 жыл бұрын
@@waqaspathan3337 Interesting. It’s probably just me
@makadi86 Жыл бұрын
what is this ide?
@wilk852 жыл бұрын
which IDE/code editor you are using?
@fortuneosho81372 жыл бұрын
Sublime text I think
@wilk852 жыл бұрын
@@fortuneosho8137 thanks
@mecheng8421 күн бұрын
print("like")
@twqwhy67632 жыл бұрын
I'm sorry, TIm, i almost never say how much your content helps. Thank you, i'm sorry that we are moneyless-bums and you have to rely onto a separate revenue stream.
@enos51922 жыл бұрын
Looking for the past 1 year
@numberonep54042 жыл бұрын
Yep yep thats the stuff
@edgostyn2 жыл бұрын
WARNING: Do not use logging to replace common messages on your system! Use print instead. You will be flooded with unwanted messages from third-party packages! The use of logging in these cases is considered bad practice!
@arikiri_69811 ай бұрын
It’s literally a built-in package but ok
@vinayakram51332 жыл бұрын
💪💪💪
@aarav_2 жыл бұрын
7:32
@danieljamesjewell Жыл бұрын
hi
@fhujf2 жыл бұрын
"Stop using print debugging" - what sort of madness is this? :D
@augustlumanlan27772 жыл бұрын
4th
@jaredbrooks2226 Жыл бұрын
Jesus loves you. Start a relationship with Him today before its too late.
@gaunterodimm63706 ай бұрын
I started a relationship with h8m last night. Nnow my balls are empty. Halleluja
@flobbie872 жыл бұрын
You stop using print debugging!
@Geogak2 жыл бұрын
Yes, please stop teaching print()
@chrysos2 жыл бұрын
1.
@suola_2 жыл бұрын
ratio
@renaudcalmont2 жыл бұрын
Those people, trying to use Python like a full-fledged language instead of the hacky script beast it really is, are hilarious