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Hello everybody and welcome back to another Python basics tutorial.

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And as I said in this tutorial right now we will actually cover the creation of files.

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We will also learn how we can delete them write to them and read from them.

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Now that is really important especially if we want to implement for example in our backdoor our download

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and upload function.

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We want to be able to download all of the files from the victim's P.C. and we also want to be able to

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download or to upload files to the victim P.C..

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So in order to get started for this we will just create a simple 60 file since that is the most simple

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file to create.

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I mean we create with the same command all types of files.

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But in order for you to understand it the best we will use this one.

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So let us actually open up our Python key interpreter.

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So right now if we import the OS command which I showed in the previous video what that means.

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And we run the system function from the OS library and we Alice and see what type of files we have right

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here.

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You will see that we do not have any file called that's not the extent.

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So let's say for example right now we want to create a file that will be called that dot the state.

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Now we can do that with our single line command.

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So let's make a file object first.

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So the file object in order to create it.

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You just type here file object underscore object or this is basically the name of your file.

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You do not need to name it like this.

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You can imitate anything you want.

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And after that you specify equals and then open.

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So basically this is the entire comment in the side of the open brackets.

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You need to specify the name of the file and what you want to do with the file.

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Now much want to do with the file I will cover just in a few moments but first of all let's actually

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open the file name so we open up the double quotes and we type your test dot the axes since we said

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we want to name the file like that.

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You can name it anything you want then you specify comma and then again double quotes and then W W stands

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for right.

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So we will be able to write anything to a file from our python program with right.

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You can actually let let's first of all just start off with right and I will show you what other mods.

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You can also use.

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So they are W R and A I will explain all of them in just seconds.

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But first of all let's just run this comment first.

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So right now we created a file object in our python programs directory

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so right now if we run the always dot system my last command once again you can see that right here

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we have a program or not a program.

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We have a file called Test dot the extreme.

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Now that file is currently empty.

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We can check that with the same commands to just get a test dot the Steve.

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You will see that there is nothing in the file.

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And right now let's say for example we want to write our password in that file for example.

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So we will do that with specifying the same name of our file that we specified in the opening comment.

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So we need to specify a file object on the score object not right and then between these brackets under

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the double quotes we need to specify the string that we want to add to that file so we can add anything.

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So let's say password

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is for example one two three four five six seven eight nine.

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And we just write that to a file.

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And once again if we run the course cat kept that the T.

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It basically says nothing.

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Let me just check out.

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Why does it say that

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or basically.

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It should say nothing as we can see right now if I exit it and the cat that does that the next day it

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will say password one two three four five six seven eight.

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So good.

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I didn't know I expected it to say actually something doesn't even matter let's just import the oil.

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Once again let us actually now try to read from that file.

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You can't use that cat command.

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You can actually use file object dot read in order to actually read that file.

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But right now since I closed my interpreter I actually have to open that file once again since I closed

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first my interpreter.

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Ten seconds ago right now reopened it my Python interpreter doesn't really know what file object is.

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Now let me just show you right now you can name it again anything you want.

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So file equals open and as you can see right now I can open a file that already exists.

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So basically what this will do is it will check out if the file exists and if it does it will open it

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for us.

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And if the file doesn't exist it will create a new file for us called the test not the extreme but it's

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in our case right now.

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The file exists and in that file we have the passwords or a single password that we specified with our

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dot right command.

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Right now it will open that file and we did that file.

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It will ask us in the next specification what do we want to do with it.

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Right now we want to specify our right here which basically stands for read.

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So what we want to do we want to read from that file we want to read what the contents of the file so

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close the double quotes closed the brackets.

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And right now if you just type your file dot read and then open the brackets and specify nothing and

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then you will see that the content of our file is basically passport and then these two dots and then

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one two three four five six seven eight nine which is specified in the previous open Python interpreter.

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So

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right now we know that we can open a file we can write to it.

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So right now if you for example tried to write to it you wouldn't be able to since let's say 1 to 3

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since you didn't open the file for writing.

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You only open the file for reading.

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Now if you were to open the file for writing once again so let me just show you.

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Let's go to the back comment and type.

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Right right here.

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You can also perform the or basically since you did not open the file since you will reopen the file

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once again for writing.

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Right now you cannot read from that file since it says file not open for reading.

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But right now you can run this command that we tried before which is file dot right.

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One two three.

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If you just specified that.

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And right now if you open file once again for reading which is just ah and you tried to read that file

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you will see right now that file only has one two three and it doesn't have the file or pardon me the

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password.

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And then one two three four five six seven eight nine in it so it's good to understand that R stands

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for read W stands for right and a which you can specify right right here.

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So if you open for a plus it will actually allow you to append to that file as you saw previously.

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Once we open the file to rights to it it's actually first deleted all of the previous contents of that

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file and then written the 1 2 3 to it.

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It basically replaced the previous contents with this right here.

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Right now let's say for example if we wanted to add four five six to this without deleting the one two

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three we would have to open that file with a plus.

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So you open that file as though the DB and then you specify D a plus right here and right now if you

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just type your file that's right and it specify for four or five six and then you try to read from that

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file.

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Whoops.

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Why does it say nothing

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right now it this says nothing.

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So not really sure why that happens.

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Let me just close this once again and catch it as the extreme.

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OK.

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So you have right now.

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Not really sure why sometimes it can.

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It shows and sometimes it doesn't.

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Probably because I opened it in the append mode.

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That's why the read didn't work.

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But right now we have the one two three four five six and four five six.

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Now we have twice the four five six since I actually typed it twice in order to check why it couldn't

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read.

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But you can see that it successfully appended these other numbers to our 1 2 3.

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So let's actually write a program.

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So now let's remove the tester to sleep so we can make a new test to Steve.

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That's actually a nano Python.

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A dot pi.

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So right now standard the input our Python path and right here we can for example open our file so a

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fan equals open let's say it's called I know.

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Let's call it the contest not the extreme we open it.

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Write it then we close this.

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Then after that we actually want to write to that file so if I find out right.

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We after that need to write what we want to write so let's say we want tell a world.

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Hello world.

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Right here we close that

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and then we can actually more let's actually leave it for a second just on this.

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So let's control all save control acts to exit stage mode by 28 point.

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Point by and then by template we run it you will see nothing really happens but if you compare this

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illustrate here and this illustrate here you will see that right now we have to test out the file with

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the hello world and let's say we want to make another program but we will use the same one we will just

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re write this one and we want to read from a file.

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We will specify this right here.

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We will specify dot read.

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So and read the basically not really sure if we have to print this.

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I don't think so.

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So let's save this.

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Now this will open this file right here and it will print out all the contents that are currently in

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that file.

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Now in my case that is the Heller world so that's actually run that once again.

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So we have to we have to add the print statement.

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OK.

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Doesn't matter let's edit.

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So print f and read and read.

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Now it should print the hello world to us as we can see right here.

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It's successfully printed the contents of a file in our output.

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So it's good to remember that in the W stands for right read stands for.

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Pardon me stands for read and a stands for append.

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So that's something you should know.

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It is very useful and we will be using these commands in our backdoor making so that's about it for

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this tutorial.

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I hope you did and I hope I see you in the next one by.