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Hey, in this video, we will work on the edit and the complete case.

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So just to refresh your memory, let me show you how these two commands work currently.

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So first let me just see the list of to dos and then enter edit as a command.

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So as soon as we press edit.

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The program asks us to enter A to do so.

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That is the equivalent of this.

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This line here produces that output.

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Now, once we enter here a number, for example, if we want to edit number three, we enter three here.

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So when we enter three, our program subtracts one from three because the list indexing starts from

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zero.

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So if we enter three as a user, actually we meant to say to the item with index two because this has

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an index of zero, this is an index of one.

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This has an index of two.

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So play has an index of two.

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Therefore, we get two here.

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Then what we do is we get a new to do from the user.

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So here we go and train you to do.

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Play a game.

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Press enter.

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And once we entered play a game here.

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So play a game is part of new to do.

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And then we change in the list.

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So we changed the item with index to to that new item.

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So play will be replaced with play a game.

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Now, if we exit the program, exit press enter and then we check to dos.

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So if you want to refresh it, reload from disk.

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No changes are written in the file.

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Why?

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Well, because.

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We didn't write any files here.

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We didn't handle any files.

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So let's fix that in this video.

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No you know that you can use the with context manager or.

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But what exactly do you do here.

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Do you read or do you edit the file?

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Well, you do both.

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First, you want to open the file in read mode.

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So once you get the number from the user and you.

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Subtract one from that number.

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Then somewhere here, perhaps you want to get the existing list of to do items.

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So in here I'll get that with context manager and just copy it here.

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So that will give us the two do's in the list.

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The existing to Jews in a list.

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And then.

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We get the new tattoos here, then we replace the new to do in the list.

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So at this point, the list should have been modified.

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I can prove that to you by checking with the print function.

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To reduce.

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Let me add some extra information here is to dos existing.

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Existing to dos.

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And then another function after we modify that to do list print.

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Here is how it will be.

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And again, we print out the tattoos variable and run the program.

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Edit So we wanted to edit number three.

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And so once I press three, which corresponds to this line here.

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Then we get printed out this line and then we enter a new to do.

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Play the game, press enter.

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And here is the new list.

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So play the game is not part of the list of bots.

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You see that it's missing a backslash.

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And so let's add a backslash in here.

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So we want to replace the existing to do with new to do plus.

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Beck slash rn.

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And then we need to do something with that list.

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So we need to write that list back to the file.

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For that we need the right with context manager.

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So I'm hoping that and putting it here at the end.

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So just before the case complete line, we put that and perhaps we don't need these lines anymore,

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so.

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Remove that and this print function as well.

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And that's about the ended case.

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So I'll run this again.

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So we have these edits.

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Let's try number four.

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So that is fix.

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Fix it.

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Well.

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Show.

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And there we go.

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Fix it.

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Well, is now number four exit check to make sure in the file.

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Yeah, fix it.

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Well, it's here, so it's working.

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And let's also implement the complete case because this is also not connected to our file.

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So we get the input from the user.

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That's the index.

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We remove that index from the list of boards.

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We want to get the current list from the file again.

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So again, we need this two lines.

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So we get the current lists, we remove the item with that index from the list and then we write the

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list back to the file using that code.

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So paste it here and let's run.

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So let's see what we have right then.

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Say complete.

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Which one do you want to complete?

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Three Press enter show.

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So play is not there anymore.

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And let's exit and go to to Deuce.

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And your play has disappeared.

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If you want to make this complete comments more user friendly, perhaps you may want to show a message

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to the user.

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So I'll write a message f string construct and have string here and say to do.

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So we want to tell the user that this to do was removed from the list.

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So which is it to do?

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Well, the removed to do, we can get it using list indexing so we get the number here, the index from

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the user and then we get the lists.

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And before we removing that to do from the list, we want to access it to store it in a variable.

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Removed to do all you can say, to do to remove because removed do doesn't make so much sense here since

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it has not been removed at this point from the list here it is removed actually.

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So let's say to do to remove is equal to to dos.

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Number minus one.

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Or you could also say create a new variable here.

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Index is equal to number minus one so that you don't have to perform this operation two times in the

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code.

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You just perform it once a year and then you replace this to that variable and also this to that variable.

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So that's the beauty of variables and that will give us a to do to remove, which was play in our case.

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And then we place that to do in here and that should do it.

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So let's run this again complete or let's show first, then complete.

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Let's try number to show her.

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We didn't get any output because I forgot to print out the message.

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So print.

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Message.

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Run again.

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Show complete so that to do was completed, but it was not printed out.

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Complete number two.

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And so we get this to the fix it well was removed from the list.

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Now you see this brake line here?

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If you want to remove that brick line, you want to go back in here.

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And say to dos that index dot strip and then goes backslash and so does this make sense to you?

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Well, the idea is that this is a string, right?

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So the situation here is like this.

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We have a list to dos.

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You know, item one, item two and so on.

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So to DOS one, that's strip, what you're doing is actually applying the strip method to that string.

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So that was just to be clear, you understand this and that's the final code.

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So let me run it for one more time.

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Show complete.

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We want to complete number two this time and we get this message to do right was removed from the list

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so that message is printed out correctly and that finishes this video.

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Thanks a lot for following.

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I'll see you.