Python 3 Programming Tutorial - Common errors

Key Takeaways

hello everybody and welcome to another Python 3 Basics video in this video we're going to be discussing some of the basics to debugging in my videos I get a lot of questions for help where people have errors and they're not really sure where the problem is but if they use some basic and simple debugging they'd realize how obvious the answer really is so most of the time the problem is a typo followed very closely to a misunder understanding of indentation and standards but usually it's a typo um and I guess they just don't understand what the error is saying but every time you see this error it's like oh you should just automatically be like oh I must have type it somewhere so if you don't know what standards are standards are basically how we organize our code so with python unlike most languages you define blocks of code uh like functions with indentation so Define a function and here is your functions code everything goes in here and then whenever the function's done it's just literally um you just unindent and you start new stuff so this is the function BL block and this is not the function block and when people start getting into trouble they do stuff like this and that gives them um problems uh with syntax now there's obviously a lot of Inc uh in-depth common issues that you might find from time to time and you can find some more debugging videos uh by searching for debugging in my channel uh for now I'm just going to keep these uh examples pretty basic the first error that we're going to discuss is name error is not defined so uh an example of this one is going to be variable equals 55 print ver iable so we've obviously typo a variable and we go to run and we get you know uh name error variable is not defined and this sometimes drives people crazy especially if maybe this is variable and this is the typoe variable and they say they see name Arrow variable is not defined but they know they just defined it like they just defined it so they start freaking out but almost as always this is the case it's they've just simply typoed variable now we can talk about indentation issues here's an example of something you I've seen a few times uh task and then they come down here uh task two and then they start typing um whatever um and you get expected and indented block um and this just means that it expected some sort of indentation here uh another time uh you'll see something similar uh when it's expecting another indentation uh yet slightly different is say you've got print or better yet a variable where it says x equals um actually first we'll show print uh print and people maybe print hello there then they come down here and immediately you should recognize that oh something is wrong because python has indented me and I don't know why and it's for the reason before where you could put something something like this and then more stuff um but then some people continue on and you'll have print um f let's say and you run and it just says invalid syntax well that's not very helpful to some people especially if it's not going to highlight where your invalid syntax is but again generally it's because you didn't close something off now another common one that people are going to get is going to be the following it's going to be EOL while scanning string literal um and this happens a lot if say you've got a variable and the variable is a string of text and like this string of and then print X and we'll run you get e while scanning string literal and the reason why you get this is this string never finished yet we started a new line and he's very frustrated so you'd have to close this off now those are just some of the common things uh and I realized Maybe that was just really painfully slow for some of you guys um but this actually catches a lot of people I'd say at least 90% of the um problems that people have they you know if they leave a comment and they're having a debugging problem they've got something wrong with their script they can't figure it out honestly 90% of the time uh it's one of these things and of that 90% probably 90% of the time it's just a simple typo so anyway thought it'd be a good idea to go ahead and cover that uh as far as you know name or you know variable not defined uh almost always a typo um so sometimes people just don't understand what the error is even saying to them so they don't even know what to think so anyway that's going to conclude this video hopefully that was helpful for some of you guys as always thanks for watching thanks for all the support subscriptions and until next time