WEBVTT 00:00.080 --> 00:03.530 And let's start step number three for this final project. 00:03.530 --> 00:05.060 So what do we want to do here? 00:05.060 --> 00:10.820 We want to write each file name for each photo that we take inside a log file. 00:10.850 --> 00:14.570 So I'm going to go back to my photos Finder project folder. 00:14.570 --> 00:19.160 And I'm also going to remove those files for now okay. 00:19.790 --> 00:25.340 So when we take a photo we also want to add the file name to a log file okay. 00:25.370 --> 00:28.520 That's going to be useful for the step five and six. 00:28.520 --> 00:33.830 When we want to get access to the last photos and display them on a web page. 00:33.860 --> 00:34.250 All right. 00:34.250 --> 00:36.590 So here we don't have any text file. 00:36.590 --> 00:39.260 We're going to create a text file from the program. 00:39.260 --> 00:43.790 So when we start the program we're going to actually remove the text file. 00:43.790 --> 00:47.120 So we're going to start from a fresh log file every time. 00:47.120 --> 00:51.320 And when we add a photo in the program we add the file name. 00:51.320 --> 00:55.880 So we add every time a file name to a new line inside the log file. 00:55.910 --> 00:56.180 All right. 00:56.210 --> 00:57.920 So let's get started with this. 00:57.920 --> 01:03.260 So I'm going to create a log file name here in my global variables. 01:03.350 --> 01:08.690 Here I'm going to name it log file name. 01:08.690 --> 01:13.370 And that's going to be what that's going to be inside the camera folder. 01:13.370 --> 01:16.580 So I'm just gonna use that one. 01:17.420 --> 01:26.630 And then plus let's name it photos maybe photo logs dot txt. 01:26.660 --> 01:32.720 I'm going to add a txt extension just in case we want to export this to another operating system. 01:32.750 --> 01:37.250 All right so it's going to be photo logs dot txt inside this folder. 01:37.250 --> 01:42.530 And now for example after the camera before the Gpio it doesn't really matter. 01:42.530 --> 01:50.840 Here I'm gonna do a remove log file as a setup step. 01:50.840 --> 01:53.030 So the log file doesn't exist yet. 01:53.030 --> 01:56.030 But when I'm going to create one it's going to be here. 01:56.030 --> 01:59.220 So we want to remove in case there is one I'm going to do. 01:59.250 --> 02:05.310 If OS dot path dot exists with the log file name. 02:05.340 --> 02:09.060 Okay, so I make sure that it exists before I remove it. 02:09.180 --> 02:12.060 If it doesn't exist of course I don't remove it. 02:12.630 --> 02:17.850 So I do OS remove with the log file name. 02:18.270 --> 02:19.470 And I'm also going to print. 02:19.470 --> 02:21.270 So only if we remove it. 02:21.540 --> 02:26.610 Let's say previous log file removed. 02:27.630 --> 02:27.990 All right. 02:27.990 --> 02:28.920 So that's it. 02:28.950 --> 02:31.980 We just remove the file if it exists. 02:31.980 --> 02:37.140 And then to add a line inside this log file I'm going to add another function here. 02:37.170 --> 02:40.590 I'm going to add it right after take photo. 02:40.980 --> 02:46.470 So let's name this one update photo. 02:47.370 --> 02:48.990 Log file for example. 02:48.990 --> 02:51.750 And what do we get as parameters. 02:51.780 --> 02:57.140 Well we're going to get the log file name to know where we need to write the log. 02:57.140 --> 03:01.760 And also we're going to get the photo file name. 03:02.030 --> 03:02.450 Okay. 03:02.480 --> 03:09.380 So once again I could use the log file name and put it before that function and use the global variable 03:09.380 --> 03:10.070 inside. 03:10.070 --> 03:12.680 But I'm just going to use instead a parameter. 03:12.710 --> 03:12.950 Okay. 03:12.980 --> 03:18.050 So basically we could take those functions here and put them somewhere else. 03:18.050 --> 03:19.790 And they could also work. 03:19.820 --> 03:20.000 Okay. 03:20.030 --> 03:23.600 We just need to provide the log file name as an argument. 03:23.600 --> 03:25.850 So let's write this function. 03:25.850 --> 03:26.780 What do we want to do. 03:26.780 --> 03:28.550 We want to open the file. 03:28.580 --> 03:34.370 To open the file with we've open log file name. 03:35.450 --> 03:37.730 And then what mode do we want. 03:37.760 --> 03:39.080 Do we want to read. 03:39.110 --> 03:40.460 No we want to write. 03:40.460 --> 03:43.130 But do we want to erase everything and write. 03:43.160 --> 03:45.440 No we want to append to the file. 03:45.440 --> 03:48.020 So I'm going to use the A mode okay. 03:48.050 --> 03:50.930 We're going to open the file and open a new line. 03:50.960 --> 03:53.480 I'm going to do as f okay. 03:53.480 --> 03:55.660 So we can do f dot Right. 03:55.660 --> 03:56.710 And what do we write? 03:56.710 --> 04:04.750 Well, we write the photo file name and then we're going to need also a new line character. 04:04.750 --> 04:07.570 But I'm going to start like this and show you what's going to happen okay. 04:07.600 --> 04:13.270 So every time we call this function we add something to the file. 04:13.270 --> 04:15.280 And that's going to be the photo file name. 04:15.280 --> 04:17.920 So now that I have my function I can call it. 04:17.920 --> 04:27.010 So update photo log file I can call it here update photo log file. 04:27.010 --> 04:28.300 So you see that here. 04:28.300 --> 04:29.200 What we do. 04:29.230 --> 04:33.070 This is kind of the main logic here for the program. 04:33.070 --> 04:37.150 And what we do is we just call the different functions that we have created. 04:37.150 --> 04:47.620 So here I call update photo log file with log file name and also the photo file name that I just got 04:47.650 --> 04:49.750 here when I took the photo. 04:50.950 --> 04:53.410 Photo file name. 04:53.740 --> 04:58.370 All right, so when I take a photo and I save the photo, I also save a log. 04:58.430 --> 05:00.170 Okay, let's save that. 05:00.170 --> 05:03.080 And actually I saved it as project step two. 05:03.110 --> 05:06.710 But I'm just gonna save it as step three. 05:06.740 --> 05:09.110 Then I'm going to modify step two again. 05:09.110 --> 05:13.040 So you can download the correct Python file for each step. 05:13.040 --> 05:15.020 So project step three. 05:15.050 --> 05:16.430 Let's go back here. 05:16.670 --> 05:16.940 Okay. 05:16.940 --> 05:18.980 Let's stop whatever we had running. 05:19.010 --> 05:21.980 I'm also going to remove everything from this folder. 05:24.020 --> 05:24.740 Okay. 05:25.850 --> 05:32.210 And let's do Python three project step three. 05:34.670 --> 05:36.050 So camera. 05:36.080 --> 05:37.190 Okay Gpio. 05:37.220 --> 05:37.520 Okay. 05:37.550 --> 05:43.760 You see that we don't have this log because there was no log file. 05:44.810 --> 05:45.200 Okay. 05:45.200 --> 05:49.010 So now I'm going to take a few pictures or at least two. 05:50.720 --> 05:51.020 All right. 05:51.020 --> 05:52.160 This is the first one. 05:52.720 --> 05:54.190 Let's see what we have. 05:54.790 --> 06:03.460 We have the photo and we have the photo log.txt with you see the path to the image. 06:04.660 --> 06:05.320 All right. 06:06.100 --> 06:06.490 All right. 06:06.490 --> 06:08.350 So we took a second photo. 06:08.350 --> 06:13.120 And you can see here we have the second photo and the log is updated. 06:13.120 --> 06:17.710 But as you can see we just add the path right after the first one. 06:17.710 --> 06:24.730 So if I want to have one in each line I also need to add it's going to be in this function. 06:24.730 --> 06:27.880 Here I could do f dot write for the file name. 06:27.880 --> 06:33.160 And then I can do f dot write with a backslash n character. 06:33.190 --> 06:35.650 Okay let's save that. 06:36.490 --> 06:42.370 And let's let's just close it and let's stop the program. 06:43.660 --> 06:43.900 Okay. 06:43.930 --> 06:46.840 And you can see here we still have the log file. 06:46.870 --> 06:48.970 But I'm going to start the program again. 06:50.680 --> 06:57.180 And it's going to previous you see previous log file removed because it existed. 06:57.180 --> 06:58.860 Now we don't have any log file. 06:58.890 --> 06:59.460 Okay. 06:59.460 --> 07:02.370 When we take a photo I'm going to take a photo. 07:03.480 --> 07:03.780 All right. 07:03.780 --> 07:07.710 You see we took a photo and we have the log file that's also created. 07:07.710 --> 07:09.510 I'm going to take a second photo. 07:09.510 --> 07:11.760 So wait a bit and take a second one. 07:12.600 --> 07:12.990 All right. 07:12.990 --> 07:14.880 So I took another picture. 07:14.880 --> 07:18.450 And now you can see we have one log per line. 07:18.450 --> 07:20.430 So one file name per line. 07:20.430 --> 07:21.720 And that's basically it. 07:21.720 --> 07:25.470 So to recap we have created a. 07:25.500 --> 07:30.540 So we have a log file name here that we create using the camera folder path. 07:31.350 --> 07:34.920 We remove the log file at the beginning if it already exists okay. 07:34.950 --> 07:42.570 And then when we take a photo right after taking the photo we update the photo log file with this function 07:43.260 --> 07:49.950 here, where we open it, we append the new photo file name after the other ones, and that's pretty 07:49.950 --> 07:50.640 much it.