1 1 00:00:01,630 --> 00:00:03,010 Hi guys, and welcome back. 2 2 00:00:03,010 --> 00:00:04,240 In this video, we're going to learn 3 3 00:00:04,240 --> 00:00:06,910 about decorating functions with parameters. 4 4 00:00:06,910 --> 00:00:08,370 So, let's take a look at our example, 5 5 00:00:08,370 --> 00:00:10,830 and do a little bit more with it. 6 6 00:00:10,830 --> 00:00:13,700 Here we've got our make secure decorator 7 7 00:00:13,700 --> 00:00:16,430 and our get admin password function. 8 8 00:00:16,430 --> 00:00:18,130 If instead of get admin password 9 9 00:00:18,130 --> 00:00:20,470 we wanted to change this to get password 10 10 00:00:20,470 --> 00:00:23,590 and take in a panel decorator and then do something like 11 11 00:00:23,590 --> 00:00:27,300 if panel is admin then return one, two, three, four 12 12 00:00:27,300 --> 00:00:30,200 otherwise if panel is billing 13 13 00:00:30,200 --> 00:00:33,660 then return super secure password. 14 14 00:00:33,660 --> 00:00:35,070 Something like that. 15 15 00:00:35,070 --> 00:00:37,940 Now, of course, when you call the function 16 16 00:00:37,940 --> 00:00:41,680 you're going to have to pass an A panel, such as billing. 17 17 00:00:41,680 --> 00:00:46,680 But this function actually won't take in the argument 18 18 00:00:46,730 --> 00:00:51,730 because our function here, calls the original function 19 19 00:00:51,780 --> 00:00:53,520 without the argument. 20 20 00:00:53,520 --> 00:00:56,550 So here's what's gonna happen when you call get password. 21 21 00:00:56,550 --> 00:01:01,460 Remember, get password is replaced by secure function. 22 22 00:01:01,460 --> 00:01:02,630 So, secure function at the moment 23 23 00:01:02,630 --> 00:01:04,500 does not have any parameters 24 24 00:01:04,500 --> 00:01:07,910 so you won't be able to pass billing to it. 25 25 00:01:07,910 --> 00:01:11,620 In addition, when you call the original function 26 26 00:01:11,620 --> 00:01:13,380 no argument is passed either, 27 27 00:01:13,380 --> 00:01:16,240 so even if this function took the argument in, 28 28 00:01:16,240 --> 00:01:17,550 it wouldn't be passed in then. 29 29 00:01:17,550 --> 00:01:18,750 So obviously we have to fix that. 30 30 00:01:18,750 --> 00:01:22,400 We have to put the panel in there and the panel in there. 31 31 00:01:22,400 --> 00:01:25,660 Then what happens is billing gets passed to secure function 32 32 00:01:25,660 --> 00:01:27,410 then it gets passed to the original function 33 33 00:01:27,410 --> 00:01:30,580 which is get password, and then this will work. 34 34 00:01:30,580 --> 00:01:32,160 However, this is not good 35 35 00:01:32,160 --> 00:01:36,430 because we have coupled our make secure decorator 36 36 00:01:36,430 --> 00:01:37,570 to this function. 37 37 00:01:37,570 --> 00:01:40,080 That means that we can't use it on other functions 38 38 00:01:40,080 --> 00:01:42,850 that take in different arguments. 39 39 00:01:42,850 --> 00:01:45,140 So instead, what you usually do with decorators, 40 40 00:01:45,140 --> 00:01:47,860 is you make them take unlimited numbers 41 41 00:01:47,860 --> 00:01:49,500 of arguments and keyword arguments 42 42 00:01:49,500 --> 00:01:51,580 so you can cater for everything. 43 43 00:01:51,580 --> 00:01:53,310 Then once you do that, as you may know already, 44 44 00:01:53,310 --> 00:01:56,230 is star args and star, star kwargs. 45 45 00:01:56,230 --> 00:01:58,670 And then you just pass them on as well 46 46 00:01:58,670 --> 00:02:01,200 to the original function. 47 47 00:02:01,200 --> 00:02:04,960 So that will make it work and also it won't limit you 48 48 00:02:04,960 --> 00:02:07,010 to using it with only this function. 49 49 00:02:07,010 --> 00:02:08,690 You can use it with any other function. 50 50 00:02:08,690 --> 00:02:11,810 This get password here must still be called 51 51 00:02:11,810 --> 00:02:15,420 with the correct argument for the original function. 52 52 00:02:15,420 --> 00:02:17,510 But this one here doesn't care 53 53 00:02:17,510 --> 00:02:20,170 what arguments are passed in. 54 54 00:02:20,170 --> 00:02:21,390 That's everything for this video. 55 55 00:02:21,390 --> 00:02:22,850 Thank you for joining me in this one, 56 56 00:02:22,850 --> 00:02:24,500 and I'll see you in the next one.