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A Deep Look at Logging

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agenda it's pretty simple 1st what try to explain why loving might be useful because it is my impression is that is 1 of the most exciting underused modules then how do we make it or this shadowing right the source of of the of the of structure and sometimes optional content cancer run over you during the all time favorite is running so so this used to be a price notebooks for scaling issues I just make some screenshots of PDF but you can get all the code thank all let's start with the
object of if you don't use a lot things module and all of
this In the most basic way to get the messages from most likely you can use it for multiple things so looking at that we have all the information the first one debugging you want to know what our programs doing what values are in that moment we might run into situations where something goes wrong we want also want to report on the we also different also we access little division function we just only division so we call that from other men function which just what iterates through a complex task and now we have 4 calls that we might want to see it and wanted to if you were to write you'd probably started that's interesting line of interest rates have not been statement out later on we move statement if this program runs into problem in the long run you may have some functionality to identify this all good and well that's how some limitations so it looks like this they're all information out that's of the thing that you actually get when you look at all those things that
you wrote yourself so that all text that is in the print statement I and it all Hamilton state companies differentiate between the people of global here all of Granger has some limitations we have to select also what we want to look at what is I want to handle we have to watch all the information we want to add to the message what the timing information much information about what function parametres whatever you can think of you have to do it yourself which also means that you have a good chance to end up with messages to us slightly different it's not a problem if you read them but it starts to be a problem if you want to use them in a different I the station walls where we used to logging on high but from the other with different living configurations and slightly strange-looking configuration that became a huge part think actually pass those because were also slightly different and if you do have to use different forms for dates the I'll finally we only have limited control farmers trust and so you can bring to file you can print to call so you can even widely functionality to write those but once you start doing this debate please come and see you own little logging module and chances are that is what that you like we need is already in the span of the so what's different with money
we have more structure in this case is pretty good because it not only helps you to processing it always you have to recognize what's the new messages so you get a nice state systems of of the same size get you area of information in the name of is obvious the Bible and the random module provides us with all the different infrastructure that we need to test so let me
ask you on nodes the slightly more 0 the end if you have a message and you want to call it from program models of what's I'll call this units especially time around this program what do I really carried out so if something is going wrong and I'm interested in Geneva let us come from as your program goes have multiple molecules multiple libraries and in there that may or may not produce interesting messages you want to control over you also want some relational context when this sad you may even if you do on looking for the web standards that session information and things like that so that in life Willie on and following the and we use a lot what is this is saying that you normally think 1st about a new watermarking message that's what you want I'm doing this this function value of of highly holders of all of the so normally if you think about letting you think about text extreme but it's completely reasonable with just a few changes to make the right of Jason which again makes parsing much simpler and moves to slowly into the direction of structure learning where you can send a lot of messages to a database and do some pretty advanced query which would be extremely hard did all by hand in text at the beginning finally if we have a message we want also to control this message and so do we send it to file if ascended to find wonder which dating and do we want know what process environment may be sentenced to a socket on database do we want to record data and this is things that you what would have been implemented if you just go around which allowed in what you implement saying challenge here implements not always in the what's the most transparent way so there some well let's see things that you
should know going to start with but to keep things easy just this is just the same program we add them previously and not just with know what see there is that it doesn't not really have much could 2 year program this even a pretty bad example because what we have serious well known real business logic of programming all just division but even that each log message is just like in a statement and you have some extremely easy configuration of this as a starting base the conflict basically just tell out of the module that it should be to debug messages of something about 2 lines extra don't fall under different so no worries on
the use of which this kind of but can say that even with the knowledge and it should get some of those features we have lost the and the transformer we have seen not level in philology but always at the beginning that's the name of the of the of the we corrected 1 that which is why it's all with with the level of agreement of all all we have the honor stuff trace for the exceptional going back but we
can see that we just so that we on the subject yeah problems such exceptions you do not only generates around and after a message so what level error but he also said that the sector makes parsing again somewhat probably due to the file and changes shot we get
this information essentially for free about 1 of just a 2nd iteration of solved it the subject we got a lot of extra
features on having the same that we want our thoughts and logging module to the actual infrastructure of the last year so what we actually use the following messages that not point of departure right in this here we present from the of module and then we have different functions that solve to come indicate whether it's interesting last message was something that being called US system treats me critical you can have different lots of different places in your program you can question the only bloggers themselves have some configurations the node which handles this talk news in the body of the of the later and send out the messages proper that's why the filter that is at the of June and July and what could be the right into account so fine and we're taking father-in-law sockets cue from what processing 14 and counting the module it's quite likely that you find something that is useful maybe not perfect but also was a and format and the form of a chance to lock message I think it takes them into the actual text of the whole so this all couple of different objects CEO the latest we what we see later but it's not where complicated to get and if you call based conflict only happens on the it's
not just sort of very basic infrastructure for the use of data gives you another gives a stream and that gives you a standard format and engendered puts all this information that we so
previously the most interesting thing is usually what Matlock messages should be used but like the meant to just mostly for debugging so if you need extra information because you're looking into some problem it's not something you would have enabled as you run your program can end up in a lot of false usually they shouldn't be a problem maybe info this information like I'm starting my program i'm doing model this and to might be interesting that's the only way you on your way but cannot warning it's just something that at 1 point in time you should probably look into then you know something went wrong and find critical your programming about pressure needs to be terminated so also a helps you to this structure would you write to think about what the formation don't want and this these you see that you know that the volume of all of the information found long inception assesses tragedies of our relativistic theories is that and it the only thing that they want out of this from we talk but most likely because course that helps you already to build your structured locking you can build from there the most basic thing is just get of messages into the ground set up for the fine-tuning can happen afterward now we give slightly more often known complex this is basically the basic config is just the easy way to configure lot module mostly focus groups so if you wanted to do just 1 call to get according space conflict what I user addition to the slide before the 1st of all I have some form of specification of those wanted in college basically from the star formants also be used for them it's a data model for parsing and printing to so what information want to get out wanting to keep in mind is that MS or not included for some reason or other items on the screen and performance tells us from what information we want to log in module to the the interesting thing is that the only part of this message that we supplied is the last part everything else is provided by the so the model will tell you what time as specified by the former but MS the main on the net and also lot it will give you the name of the log of messages that is insulated you get much more information if you wanted including the on line in the source code including the spread of the society so you can almost everything about your problem and in a way that you'll find the and cost about interrelated you will see that in addition to the locker message pure text strings you at some there some information the only once we want there this use the old style string formatting seen from want to on and you can also use them you start spring from that would be the just a configuration options formant was talking just use simple so Solomon complex is a conflict amounts of on which and looked like developed if you I will start knocking which developed into a new messages don't show up that's what you from the default configuration on and test the default of set warning only so debugging information to escape from well I don't particularly like basically cost at the end you'll have to learn to difference modes of set the it has its own this interesting thing you that it is only called once once it is called a set set up the model system and you called again it will not necessarily which can be confusing said might suggest that
in together with this was it's slightly longer than that at least in my view of easier to understand so you request when you at the level of and get through a handful aside the volatility and love together was a formative years learning system said essentially the same thing we did before you can use but so just in your Python code may be just what a molecule working set up that you want the usually what
if you go a fault line the complex situation you would do something different but it's getting there what did you say it because of that we assign to a stream and to the loss and we assign the fulfillment of models to stream the Lord always says it's block-level is and a form
formal in more detail so the format has its to formants strings 1 for the time 1 of the most the on a lot of information has the same textual policy whatever you want to say grows and some parameters that In all editors following from this conflagration that that's a lot of these all the things that
have to be on a wearable in
on local approach to add to your message I've actually on taking out some costs there are quite a lot of stuff some of them are quite surprised by the name down the line number by default they are in there you can do disable them for performance reasons if you want to just make much of a difference so just take away in your what you can when they point to supply code whether that message originated from which may not be useful on the same day that you want but may be useful when you see a lot of message saying 2 weeks to months to years after your political the thing finally we
just set up the conflict is also a configuration file conflict like small well it is not actually easy to read but it is quite powerful so what you take you should take away the yellow parts just different objects that we've seen previously so we have a lot of don't the end of the all we the reference to each other so the learner knows that is 1 handsome remains constant and so you have to know that is 1 form name long for and all the other parameters sentence nice thing about this is that it's quite easy to add information and if you have your conference which unified outside your and program code it's quite easy to a universal system you can change a lot in configuration from you
can have there's questions the learning more interesting different handlers to get out of so what do these existing complex than that of base a 2nd Levin's unlock 1 message in them and if you can see that this is a catalog file now my message and in my home also in love and now what you want to you can have many as many
emphasis you wanted so it exists all consuming now that we have different fathers and instrumental
thing to keep in mind the bonds of love is that you can have different hand as with different levels so if you say I believe errors in my fault but everything that comes so you
can do that market set so if
we can just the following children prints a warning signals that influence when I attractive this but we quite easy so you notes you basic take modified that
and get more information you can also do this with things get interesting infrastructure in charge of just request as a lot of normally waste while
some may or don't which that's quite good quality name of
modules and what it weights and Anderson reading week so you have a tree of learning objects and you would normally controversies in ways that can attach the 500 and everything else to do with rather than at track this because that then you have some switches to restore computer where a lot of messages so only with other countries regions and at 1 end of the module Best practices 2 . name phrases
so there are a little bit faster because wants and like to show you cannot filters filters that the dogmatic so it's just a function that you call with what message which then decides whether it gets passed on or not you can also to modify the left so if you want to add extra information you can do that and
for that I just wish ready to use the modified noble the interesting thing about the most likely we can think of this world so once you health-promoting which we built these a ways of a of the message is passed up the tree is willing to so you have something called if it is not enabled the that's survival of all gets rejected if not a record is created and the local photos of life now if there was no handler at security level the center with people if not it will go to the parent that's a parent it will not to work with filters and it will not work so that that this moment the only way to get the message out is the which is also quite nice because you know that the emphasis responsible for the and then you get From this retrospective from these kind of annotation from the modular just what we did was kind of but I think if you ever run into any problems with blocking this is the most logical course there are quite a lot of things that you can which we don't what we OK so that's just
some basic of filtering you can the problems we point something you can get callable before was that it was just object at of little message so for the 2 . 7 years slight inconvenient but not much more complicated you can do a lot of X just a few you can get a dictionary of the rock records and that information which actually something that happens a lot in what you do not have what the the and this plot lexical records it's created their looks at all like this you can see that I prices on strings and so but it also from from the 500 working so tons of information that you might find a use for all but not details but just the so
if you want to problems to do that so you see what I'm going to realize I want to recommend just 1 module log to a somewhat of a result on of its principles are learning trees this is about each 1 of let's just find that gets created when do cause the people or visualize the body which we've grown and I know because I prices so that's quite a lot modules as an exercise for you so would just recommend open the question import request management principle in 3 so we 1st of all all other modules will also have their own blogs which are by default not enable so they have not set and the loading of that but there the earth and you can and we configure and use them if you want to review
few a good use of them you would not have a questions the flu deals with that was so if you have questions from public
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Metadaten

Formale Metadaten

Titel A Deep Look at Logging
Serientitel EuroPython 2015
Teil 93
Anzahl der Teile 173
Autor Baerisch, Stefan
Lizenz CC-Namensnennung - keine kommerzielle Nutzung - Weitergabe unter gleichen Bedingungen 3.0 Unported:
Sie dürfen das Werk bzw. den Inhalt zu jedem legalen und nicht-kommerziellen Zweck nutzen, verändern und in unveränderter oder veränderter Form vervielfältigen, verbreiten und öffentlich zugänglich machen, sofern Sie den Namen des Autors/Rechteinhabers in der von ihm festgelegten Weise nennen und das Werk bzw. diesen Inhalt auch in veränderter Form nur unter den Bedingungen dieser Lizenz weitergeben
DOI 10.5446/20205
Herausgeber EuroPython
Erscheinungsjahr 2015
Sprache Englisch
Produktionsort Bilbao, Euskadi, Spain

Inhaltliche Metadaten

Fachgebiet Informatik
Abstract Stefan Baerisch - A Deep Look at Logging Do you know what your application did last night? Python logging can help you. This talk you will show you how to implement a systematic logging approach without boilerplate code and how to set up the Python logging module for different needs in production systems. We will see how to work with log files and other logging endpoints. We will address the data protection concerns that come up when logging from application with personal information. We will also look at the performance implications of logging. We will then cover best practices - how to structure logging, what to include in a log message, and how to configure logging for different use cases. We will use the Python standard logging module to implement logging. This talk is useful to beginners with some experience. An understanding of decorators is useful, but not required. Some experience in web programming is a plus.
Schlagwörter EuroPython Conference
EP 2015
EuroPython 2015

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