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Welcome to lesson 33 which roughly covers pages 200 to 200 to of the army the boring stuff with Python

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textbook.

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So if you want to delete files and folders there are three functions you can use one of them is in the

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os module it's OS dot unlink which is kind of an old name for weed and this one you would just pass

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it some file name and this will permanently delete this file.

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Now I'm passing it a relative file path hit right here.

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This is a file that doesn't begin with the root folder.

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If you want to know which begun he XTi Exactly it's the leading call the get C-w function to get the

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current working directory so you can figure out OK if I delete if I unlink bacon that text he will actually

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delete the bacon that he XTi that's inside this folder.

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So unlink will delete a single file.

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You can also delete a folder with the Ostara remove directory.

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That's our andere function and they can remove some directory as some file or some folder that you pass

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it.

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So if I want to remove the delicious folder that I have now one thing that you have to keep in mind

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when calling or MTR is that the folder has to be completely empty it can't have any files or folders

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inside of it.

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So if I try to do this right now I'll get an error saying oh this is not empty and that's just kind

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of a nice safeguard in case you keep you from deleting a folder that has a ton of files and folders

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in it.

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Now if you do want to remove a folder and all of its content will have to import the SH The shell utilities

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module and shell utilities has a remove tree is kind of like the delete analog of copy tree instead

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of copying a folder and all its contents.

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This will delete a folder and all of its content.

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So if I passed it that delicious folder name I'll just scroll down here in my file explorer so my delicious

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folder has all of this.

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All of these files and folders and side of it.

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I run this code

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orange tree.

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Will delete that entire folder and everything in it.

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So you want to be really careful with these functions because these will permanently tweak these files

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and folders.

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They won't send them to the recycling bin.

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So one way that you can be really careful with this is by doing a dry run of any code that has these

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two leading functions in them.

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So let's say of a program like this it imports OS

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iterates over all of the files and folders inside the current working directory that's returned by Lister

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and I won't find any of those file names that ends with.

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And let's say I wanted to delete datea X Files but I made a typo instead and said Dot are X Files.

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But I keep writing the rest of my program and I just say I want to delete all of those 60 files here

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not realizing that I had made this typo.

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So a dry run is when you just comment out any of the code that would actually delete files where do

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any of these file operations instead have a print function call to printout that file name.

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Let's go ahead and just change the current working directory to the desktop.

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So Lister here will just return a list of strings of all the files and folders in the current working

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directory.

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I just set to desktop and I'll just save this as an example.

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Pete why.

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So since I've come it out this code I don't have anything to be worried about as far as deleting all

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the files.

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I can run this program and it'll print up all the file names of the things I thought I would normally

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be deleting so I could just check this and I realized oh wait there's this important file that's done

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or XTi that's this file right here that's on my desktop that I was going to delete.

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That's not really what I intended.

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So instead I'll go back to my program realized my mistake and then corrected then I can run this dry

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run.

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Just one more time and I can say oh yeah.

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Switching to Python that text file that's the one I wanted to delete so I could just come into this

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line and uncomment this line to actually run this program and delete this file.

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But really using these deleting functions unlink removed directory remove tree.

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Those are all kind of dangerous to use anyway because all of those deletions will be permanent.

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There's a module called Send to trash that instead of deleting it permanently.

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We'll just send it to your operating systems recycling bin so Center trash doesn't come with Python

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you'll have to install it yourself using the Pipp installer and there's instructions in the coordinates

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for how to do this for your operating system since it's different for each operating system.

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I'll just show you on Windows can open up a command line prompt and change directories to program files

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.

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Python scripts and run clips that you actually install send to trash.

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And here I've already installed it.

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So it just says so that's already installed but that's how you can just install third party modules

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using Pipp on Windows.

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So once that's installed I can just import send to trash and send to trash has a function also called

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Send to trash and then allow you to delete any files or folders that you pass it.

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But instead of doing them permanently just tweets just sends them to the recycling bin.

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So let's take that important file that are XTi that I had right here on the desktop and then pass it

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something like user's desktop.

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Important file.

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R x T.

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You can see that we did the file but not permanently.

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I can just open up my recycling bin and say oh this is that file that I needed so I could just either

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permanently delete it here or just restore it back to its original location.

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So to recap Ostara unlink will delete a file estopped remove directory will delete a folder but the

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folder has to be empty.

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SH you Tilda.

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Remove tree will delete a folder and all its contents all the files and folders inside it.

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That's kind of dangerous.

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So what you first want to do is do a dry run where you comment out all of the calls to these delete

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functions and just have a print function call instead so that you can run the program and see what exactly

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is going to do first.

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And it's probably just better to install the send to trash module and use it's send to trash function

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to delete files and folders by sending them to the recycling bin and sort of deleting them permanently

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.