Python Logging - Tutorial

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Tech With Tim

Tech With Tim

Күн бұрын

Пікірлер: 118
@johnnytoobad7785
@johnnytoobad7785 2 жыл бұрын
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
@afonsosalbrecht Жыл бұрын
seriously?? that's a copy and pasted video from corey schafer
@danub5551
@danub5551 2 жыл бұрын
I was *literally* just searching about logging in python for a project yesterday... just in time Tim 👍
@jakes-dev1337
@jakes-dev1337 2 жыл бұрын
I swear he has us figured out
@alonso9422
@alonso9422 2 жыл бұрын
X2
@slater-cguy
@slater-cguy 2 жыл бұрын
Same!
@mccdan666
@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.
@BrandonJacobson
@BrandonJacobson 2 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!
@johnnyz1206
@johnnyz1206 2 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-yg3kd
@ShivamPatel-yg3kd 2 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-k1o
@KarthikKumaresan-k1o 9 ай бұрын
@@ShivamPatel-yg3kd Thank you so much
@jurajlk9019
@jurajlk9019 2 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
@Anequit
@Anequit 2 жыл бұрын
Can you post benchmarks of the performance loss?
@jdhoehler
@jdhoehler Жыл бұрын
Was about to comment the same thing. Such a minor point but is considered best practice.
@ExDarkx3
@ExDarkx3 5 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_clues
@goose_clues 5 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?
@goldeer7129
@goldeer7129 2 ай бұрын
seems the small gain in performance is absolutely not worth the readibility you may lose so ok but mostly doesn't matter
@BryanJenks
@BryanJenks 2 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
@ifthennotagain5195
@ifthennotagain5195 2 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!)
@krishnans2006
@krishnans2006 2 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.
@GabrielAcosta00
@GabrielAcosta00 2 жыл бұрын
I come to comment on this +1
@dimond8270
@dimond8270 2 жыл бұрын
can i ask why? ive never heard of a correct way of formatting strings?
@lawrencedoliveiro9104
@lawrencedoliveiro9104 2 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.
@moondevonyt
@moondevonyt 2 жыл бұрын
no joke, i was just looking for a logging in python video. thanks a lot Tim ❤️
@JakobJensen-y3d
@JakobJensen-y3d 7 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
@davecapstick8129
@davecapstick8129 7 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
@deveshgolwalkar3605
@deveshgolwalkar3605 4 ай бұрын
short & crisp explanation. Perfect!
@ayupitsali608
@ayupitsali608 2 жыл бұрын
Cheers Tim! Another Python skill in the bag!
@ABEL-cd2sp
@ABEL-cd2sp 2 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.
@khazartalibov9048
@khazartalibov9048 2 жыл бұрын
Nice.We would glad to see about Golang (logging, unit testing and other advanced topics )
@mikez762
@mikez762 2 жыл бұрын
i have been debugging all day with those print's. thanks for another way
@Earnest1G
@Earnest1G 2 жыл бұрын
Amazing channel. Has helped me so much when studying to become a software developer. Amazing work really!
@enzanto
@enzanto 2 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
@astronemir
@astronemir 2 жыл бұрын
Very valuable and time saving tutorial. Thanks. Fixed up my logging implementation
@gskluzacek
@gskluzacek 2 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.
@hemashankartalupuri6121
@hemashankartalupuri6121 11 ай бұрын
best thing that i found today about logging-python
@nikolakhs
@nikolakhs 2 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
@BummerSlug
@BummerSlug 2 жыл бұрын
Crazy useful! I am done with print statements now, thank you!!
@vivekan97
@vivekan97 2 жыл бұрын
Hey Tim ! great content as always. can you do tutorial on how to write unit test for Flask applications ?
@nahakuu
@nahakuu 2 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
@teclote
@teclote 5 ай бұрын
Outstanding, works great first time, lots of good ideas.
@moumniable
@moumniable 2 жыл бұрын
Perfect timing ! Thanks 😀
@thomasbates9189
@thomasbates9189 Жыл бұрын
Very helpful! Thank you!
@BombasticTom492
@BombasticTom492 2 жыл бұрын
legend finally made it
@eapenjiss7945
@eapenjiss7945 2 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
@siddheshnaik4956 Жыл бұрын
Thanks a lot , very informative !!
@mosa36
@mosa36 2 жыл бұрын
Could we get more information on db handler? I'd love to learn how to use it :)
@MichaelVash7886
@MichaelVash7886 2 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
@keeslauwers6824
@keeslauwers6824 2 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")
@gugugaga5867
@gugugaga5867 2 жыл бұрын
Hey Tim when are you going to open startup?
@Azsha0680
@Azsha0680 2 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 !
@ParaSteve1985
@ParaSteve1985 2 жыл бұрын
Everything i needed in just 15 Minutes! Perfect
@NishantCosmos
@NishantCosmos 2 жыл бұрын
i'm new to debugging professionally, idk why to do logging
@backdoorguy1
@backdoorguy1 Ай 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-cc8kb
@user-cc8kb 2 жыл бұрын
Great tutorial! Thanks :)
@skarface5978
@skarface5978 2 жыл бұрын
Hello, I'm new to programming and I don't know anything about it. I would like to know what you recommend
@haroldabella2041
@haroldabella2041 2 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?
@Lunolux
@Lunolux 2 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.
@secretions2991
@secretions2991 2 жыл бұрын
It's so perfect timing
@oneh0urtrades
@oneh0urtrades 9 ай бұрын
thank you it was a helpful video
@Richard_GIS
@Richard_GIS 2 жыл бұрын
Didn't know about the exception thing
@nanayaw7159
@nanayaw7159 2 жыл бұрын
Great tutorial
@shreyb1409
@shreyb1409 Жыл бұрын
my test.log file was empty till the time i did not add the logging.basicConfig, can someone explain why?
@amrithpurandhar9882
@amrithpurandhar9882 2 жыл бұрын
DSA chapter is it covered in programming expert ?
@adityaalmighty1
@adityaalmighty1 2 жыл бұрын
Hi! Any idea when is Kite going to be up?
@gbesiu
@gbesiu 2 жыл бұрын
Could you do something about linear programming please?
@BeigeAlertHamburg
@BeigeAlertHamburg 2 жыл бұрын
Logging in FastAPI gives me headaches. Dublicate lines, and no rollover in Windows.
@ImYala
@ImYala 2 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
@avnerduchovni6675 Жыл бұрын
Thanks for the good content
@mikelancaster8924
@mikelancaster8924 2 жыл бұрын
Thanks so much!
@salimzavedkarim230
@salimzavedkarim230 2 жыл бұрын
You're the man!
@realityveil6151
@realityveil6151 2 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.
@FMH201
@FMH201 2 жыл бұрын
Thank you for the video. I really hope you would get rid of the background music.
@timwebster85
@timwebster85 2 жыл бұрын
Epic! thanks
@noufalkaku
@noufalkaku 2 жыл бұрын
Hi Tim, may I know the autocomplete package your are using?
@CodeNight-dm2hv
@CodeNight-dm2hv 2 жыл бұрын
I was looking to put a logging system in my app today! How did you know?
@fabian_ftn6604
@fabian_ftn6604 2 жыл бұрын
Up
@SomeoneRandom-f9o
@SomeoneRandom-f9o 2 жыл бұрын
Very useful 👍☺️
@vanoelizbarashvili6655
@vanoelizbarashvili6655 2 жыл бұрын
very useful thanks
@ArgumentumAdHominem
@ArgumentumAdHominem 2 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
@JohnintheDesert
@JohnintheDesert 2 жыл бұрын
What is your favorite IDE?
@Lunolux
@Lunolux 2 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-l8q
@夜神月-l8q 2 жыл бұрын
What do u use as sublime theme and colour scheme 🌚
@PGhai
@PGhai Жыл бұрын
how do you log in file as well as on screen ?
@gzbin365
@gzbin365 2 жыл бұрын
really useful
@dimitriosdesmos4699
@dimitriosdesmos4699 2 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-r7352
@jonk-r7352 2 жыл бұрын
What ide?
@armkreuz82
@armkreuz82 2 жыл бұрын
Damm, I just spent the last 2 days builing my logger template for work.
@trollingspecialist554
@trollingspecialist554 2 жыл бұрын
thank you thank you thank you
@lawrencedoliveiro9104
@lawrencedoliveiro9104 2 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_tech
@jeff_tech 2 жыл бұрын
Nice Video! The music was a little bit too loud tho
@waqaspathan3337
@waqaspathan3337 2 жыл бұрын
i didnt even realize music was playing til you pointed it out
@jeff_tech
@jeff_tech 2 жыл бұрын
@@waqaspathan3337 Interesting. It’s probably just me
@makadi86
@makadi86 Жыл бұрын
what is this ide?
@wilk85
@wilk85 2 жыл бұрын
which IDE/code editor you are using?
@fortuneosho8137
@fortuneosho8137 2 жыл бұрын
Sublime text I think
@wilk85
@wilk85 2 жыл бұрын
@@fortuneosho8137 thanks
@mecheng84
@mecheng84 21 күн бұрын
print("like")
@twqwhy6763
@twqwhy6763 2 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.
@enos5192
@enos5192 2 жыл бұрын
Looking for the past 1 year
@numberonep5404
@numberonep5404 2 жыл бұрын
Yep yep thats the stuff
@edgostyn
@edgostyn 2 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_698
@arikiri_698 11 ай бұрын
It’s literally a built-in package but ok
@vinayakram5133
@vinayakram5133 2 жыл бұрын
💪💪💪
@aarav_
@aarav_ 2 жыл бұрын
7:32
@danieljamesjewell
@danieljamesjewell Жыл бұрын
hi
@fhujf
@fhujf 2 жыл бұрын
"Stop using print debugging" - what sort of madness is this? :D
@augustlumanlan2777
@augustlumanlan2777 2 жыл бұрын
4th
@jaredbrooks2226
@jaredbrooks2226 Жыл бұрын
Jesus loves you. Start a relationship with Him today before its too late.
@gaunterodimm6370
@gaunterodimm6370 6 ай бұрын
I started a relationship with h8m last night. Nnow my balls are empty. Halleluja
@flobbie87
@flobbie87 2 жыл бұрын
You stop using print debugging!
@Geogak
@Geogak 2 жыл бұрын
Yes, please stop teaching print()
@chrysos
@chrysos 2 жыл бұрын
1.
@suola_
@suola_ 2 жыл бұрын
ratio
@renaudcalmont
@renaudcalmont 2 жыл бұрын
Those people, trying to use Python like a full-fledged language instead of the hacky script beast it really is, are hilarious
@urilou777
@urilou777 2 жыл бұрын
+1
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