1 00:00:00,510 --> 00:00:08,210 Okay so I have these fruits.txt file in here which has these four lines which are not fruits anyway, 2 00:00:08,250 --> 00:00:09,970 but you get the idea. 3 00:00:09,990 --> 00:00:10,920 It's text. 4 00:00:11,010 --> 00:00:16,080 We want to add two more lines to these existing fruits.txt file. 5 00:00:16,080 --> 00:00:20,400 We don't know what is there at the moment. 6 00:00:20,400 --> 00:00:26,310 If you look at the open documentation and scroll down you'll see 7 00:00:29,820 --> 00:00:35,360 here that you can pass different moods in these argument here. 8 00:00:35,460 --> 00:00:37,260 So are which we used already. 9 00:00:37,290 --> 00:00:42,480 We used w and then you have x, if you use x 10 00:00:45,630 --> 00:00:48,280 and try to write let's say okra. 11 00:00:49,620 --> 00:00:54,450 If you execute that it's going to say that file exists. 12 00:00:54,480 --> 00:01:01,350 So unlike the w modes which overwrites a file, X will not overwrite the file if the file exists. 13 00:01:01,350 --> 00:01:07,930 However it cannot append contents to an existing file because it says that the file exists. 14 00:01:08,070 --> 00:01:11,280 Therefore we jump to the next mode which is a. 15 00:01:15,610 --> 00:01:22,090 You see that okra was added there of course with a small issue because there was not a break line here 16 00:01:22,180 --> 00:01:24,320 in the text, in the existing text file. 17 00:01:24,370 --> 00:01:26,560 So that's some information you should know. 18 00:01:26,560 --> 00:01:32,710 And if you know there is no break line, then you'd need to, let me save this text file, then you'd need to 19 00:01:33,070 --> 00:01:39,270 add a break line there to get the correct outputs. 20 00:01:39,310 --> 00:01:44,760 So anytime you add a new line you'd need to add a break line in front. 21 00:01:44,770 --> 00:01:48,580 Now how about reading that content? 22 00:01:52,410 --> 00:01:58,320 Maybe saving it you save it in a variable and print out the content. 23 00:01:58,680 --> 00:01:59,730 Will it work? 24 00:01:59,730 --> 00:02:00,930 I don't think so. 25 00:02:01,020 --> 00:02:06,550 It says that the operation is not supported, the file is not readable. 26 00:02:06,780 --> 00:02:16,110 It's a which is for appending, if you want to appen, to write, and read at the same time you want 27 00:02:16,110 --> 00:02:17,340 to add a plus. 28 00:02:21,130 --> 00:02:24,490 Just like that, execute. 29 00:02:24,820 --> 00:02:27,090 You get an empty output. 30 00:02:27,100 --> 00:02:28,200 Why? 31 00:02:28,540 --> 00:02:30,510 Because of the cursor. 32 00:02:30,580 --> 00:02:40,320 So what's happened is that when we added the okra line there so at first you created the file here. 33 00:02:40,330 --> 00:02:42,630 At this point the cursor is here. 34 00:02:42,640 --> 00:02:43,310 OK. 35 00:02:43,420 --> 00:02:52,460 Then you write the file in this line the cursor goes to the ends of the file. 36 00:02:52,460 --> 00:02:59,450 So when you read now you read whatever is left under the last line which is nothing. 37 00:02:59,690 --> 00:03:09,650 What you can do is my file seek, apply a seek method to put the curse at the zero position once again. 38 00:03:11,570 --> 00:03:15,370 In that case the cursor will go to the end. 39 00:03:15,560 --> 00:03:16,920 It will go again 40 00:03:17,040 --> 00:03:19,050 at the zero position with this line. 41 00:03:19,370 --> 00:03:23,860 And then you'll read everything from there and down. 42 00:03:24,470 --> 00:03:26,390 So you get the correct output.