WEBVTT 1 00:00:01.630 --> 00:00:03.010 Hi guys, and welcome back. 2 00:00:03.010 --> 00:00:04.240 In this video, we're going to learn 3 00:00:04.240 --> 00:00:06.910 about decorating functions with parameters. 4 00:00:06.910 --> 00:00:08.370 So, let's take a look at our example, 5 00:00:08.370 --> 00:00:10.830 and do a little bit more with it. 6 00:00:10.830 --> 00:00:13.700 Here we've got our make secure decorator 7 00:00:13.700 --> 00:00:16.430 and our get admin password function. 8 00:00:16.430 --> 00:00:18.130 If instead of get admin password 9 00:00:18.130 --> 00:00:20.470 we wanted to change this to get password 10 00:00:20.470 --> 00:00:23.590 and take in a panel decorator and then do something like 11 00:00:23.590 --> 00:00:27.300 if panel is admin then return one, two, three, four 12 00:00:27.300 --> 00:00:30.200 otherwise if panel is billing 13 00:00:30.200 --> 00:00:33.660 then return super secure password. 14 00:00:33.660 --> 00:00:35.070 Something like that. 15 00:00:35.070 --> 00:00:37.940 Now, of course, when you call the function 16 00:00:37.940 --> 00:00:41.680 you're going to have to pass an A panel, such as billing. 17 00:00:41.680 --> 00:00:46.680 But this function actually won't take in the argument 18 00:00:46.730 --> 00:00:51.730 because our function here, calls the original function 19 00:00:51.780 --> 00:00:53.520 without the argument. 20 00:00:53.520 --> 00:00:56.550 So here's what's gonna happen when you call get password. 21 00:00:56.550 --> 00:01:01.460 Remember, get password is replaced by secure function. 22 00:01:01.460 --> 00:01:02.630 So, secure function at the moment 23 00:01:02.630 --> 00:01:04.500 does not have any parameters 24 00:01:04.500 --> 00:01:07.910 so you won't be able to pass billing to it. 25 00:01:07.910 --> 00:01:11.620 In addition, when you call the original function 26 00:01:11.620 --> 00:01:13.380 no argument is passed either, 27 00:01:13.380 --> 00:01:16.240 so even if this function took the argument in, 28 00:01:16.240 --> 00:01:17.550 it wouldn't be passed in then. 29 00:01:17.550 --> 00:01:18.750 So obviously we have to fix that. 30 00:01:18.750 --> 00:01:22.400 We have to put the panel in there and the panel in there. 31 00:01:22.400 --> 00:01:25.660 Then what happens is billing gets passed to secure function 32 00:01:25.660 --> 00:01:27.410 then it gets passed to the original function 33 00:01:27.410 --> 00:01:30.580 which is get password, and then this will work. 34 00:01:30.580 --> 00:01:32.160 However, this is not good 35 00:01:32.160 --> 00:01:36.430 because we have coupled our make secure decorator 36 00:01:36.430 --> 00:01:37.570 to this function. 37 00:01:37.570 --> 00:01:40.080 That means that we can't use it on other functions 38 00:01:40.080 --> 00:01:42.850 that take in different arguments. 39 00:01:42.850 --> 00:01:45.140 So instead, what you usually do with decorators, 40 00:01:45.140 --> 00:01:47.860 is you make them take unlimited numbers 41 00:01:47.860 --> 00:01:49.500 of arguments and keyword arguments 42 00:01:49.500 --> 00:01:51.580 so you can cater for everything. 43 00:01:51.580 --> 00:01:53.310 Then once you do that, as you may know already, 44 00:01:53.310 --> 00:01:56.230 is star args and star, star kwargs. 45 00:01:56.230 --> 00:01:58.670 And then you just pass them on as well 46 00:01:58.670 --> 00:02:01.200 to the original function. 47 00:02:01.200 --> 00:02:04.960 So that will make it work and also it won't limit you 48 00:02:04.960 --> 00:02:07.010 to using it with only this function. 49 00:02:07.010 --> 00:02:08.690 You can use it with any other function. 50 00:02:08.690 --> 00:02:11.810 This get password here must still be called 51 00:02:11.810 --> 00:02:15.420 with the correct argument for the original function. 52 00:02:15.420 --> 00:02:17.510 But this one here doesn't care 53 00:02:17.510 --> 00:02:20.170 what arguments are passed in. 54 00:02:20.170 --> 00:02:21.390 That's everything for this video. 55 00:02:21.390 --> 00:02:22.850 Thank you for joining me in this one, 56 00:02:22.850 --> 00:02:24.500 and I'll see you in the next one.