1 00:00:05,530 --> 00:00:06,730 Welcome back everyone. 2 00:00:06,910 --> 00:00:11,520 Let's go ahead and work through the solutions for the object oriented programming exercise. 3 00:00:11,530 --> 00:00:13,480 All right here we are at the exercise. 4 00:00:13,520 --> 00:00:19,050 I want to scroll down until we get to our actual class account and let's start filling in. 5 00:00:19,060 --> 00:00:24,220 So again it's up to you if it's optional if you open and close princes or no princes Python 3 won't 6 00:00:24,220 --> 00:00:26,170 complain either way. 7 00:00:26,170 --> 00:00:31,480 But first we're going to need to have our own method because remember we want two attributes we want 8 00:00:31,480 --> 00:00:33,940 an owner attribute and a balance attribute. 9 00:00:33,940 --> 00:00:40,420 So we always start with self and then we'll say owner and then balance and especially if you want. 10 00:00:40,570 --> 00:00:48,280 You can set a default balance of zero and we'll say colon and they will assign those attributes so I'll 11 00:00:48,280 --> 00:00:54,920 say self-taught owner is equal to the owner it's passed in and then self-taught balance is equal to 12 00:00:55,520 --> 00:00:56,870 balance. 13 00:00:56,990 --> 00:00:57,540 OK. 14 00:00:57,830 --> 00:01:03,110 So we also want to be able to print our actual account owner and account balance. 15 00:01:03,110 --> 00:01:04,970 So let's go ahead and set that up right now. 16 00:01:05,420 --> 00:01:11,340 Since you already have everything we need for it will create either an S T or a method or if you want 17 00:01:12,630 --> 00:01:13,830 a representation method. 18 00:01:13,830 --> 00:01:18,960 It's kind of up to you when you want to choose in this case will work the exact same way and then we'll 19 00:01:18,960 --> 00:01:24,340 say that the account owner is self-taught owner. 20 00:01:24,380 --> 00:01:35,290 How I'm using string literals here and then we'll say a count let's just say balance balance is self-taught 21 00:01:35,300 --> 00:01:40,640 balance. 22 00:01:40,690 --> 00:01:45,090 So so far I've set up my attributes and they set up my printing capabilities. 23 00:01:45,250 --> 00:01:54,710 All I need to do is set up to deposit and withdraw methods will start the deposit method pasand self 24 00:01:54,710 --> 00:02:00,580 to make sure the positing to this instance of the account and then we'll create a variable called deposit 25 00:02:00,590 --> 00:02:09,180 amount or DGP underscore amitie and then we'll take our current balance and we're going to set it equal 26 00:02:09,180 --> 00:02:20,180 to the current balance plus the deposited amount and then we can also print out a message like deposit 27 00:02:20,240 --> 00:02:23,250 was accepted. 28 00:02:23,250 --> 00:02:26,840 It's up to you whether or not you want to print that but all we're doing here is when someone calls 29 00:02:26,850 --> 00:02:32,480 deposit they pasan a deposit amount and then you take your current balance add that deposit and then 30 00:02:32,480 --> 00:02:34,670 set that to be your current balance. 31 00:02:34,670 --> 00:02:41,300 Notice here how I'm using self to reference the self balance. 32 00:02:41,460 --> 00:02:44,510 And finally we're going to have a withdrawal method. 33 00:02:44,510 --> 00:02:50,150 So say withdrawal very similar is going to pass and solve. 34 00:02:50,160 --> 00:02:59,560 Except this time we'll say it's a WD amount or withdrawal amount they'll say if self-taught balance 35 00:03:00,040 --> 00:03:11,120 is greater than or equal to the withdrawal amounts I'll take my current balance and I'll stick to my 36 00:03:11,120 --> 00:03:14,920 current balance minus the withdrawal amount. 37 00:03:16,190 --> 00:03:24,520 And then I will print something like withdrawal successful else. 38 00:03:24,740 --> 00:03:27,220 That means I actually don't have enough money for this withdrawal yet. 39 00:03:27,470 --> 00:03:36,660 So I will edit my balance and then I'll just say Prince funds not available. 40 00:03:36,680 --> 00:03:37,140 All right. 41 00:03:37,370 --> 00:03:40,840 So let's zoom out so you can see kind of everything that's going on here. 42 00:03:40,850 --> 00:03:45,710 So all we did was we set up our method to set up the attributes the owner attribute and the balance 43 00:03:45,740 --> 00:03:46,700 attribute. 44 00:03:46,790 --> 00:03:49,300 Then we set up our representation for the string. 45 00:03:49,310 --> 00:03:53,030 So if we want to print out our account we get the account owner and balance. 46 00:03:53,060 --> 00:03:56,900 You could have had a lot of flexibility as far as what you actually want to be printing out. 47 00:03:56,900 --> 00:03:58,710 Then we set a deposit. 48 00:03:58,730 --> 00:04:04,190 So we take our current balance as a deposit amount and print deposit that and then for the withdrawal 49 00:04:04,370 --> 00:04:08,370 we first want to check do we actually have enough balance is our balance greater than or equal to the 50 00:04:08,370 --> 00:04:09,470 overall amount. 51 00:04:09,470 --> 00:04:15,590 If so then we can remove that of Charle amount say withdrawal was successful else will print funds not 52 00:04:15,590 --> 00:04:16,770 available. 53 00:04:17,120 --> 00:04:24,840 So let's do all this will instantiate a class will print the object and then I'm going to print the 54 00:04:24,840 --> 00:04:29,410 account owner or show the account balance as well. 55 00:04:29,700 --> 00:04:31,110 So will print that out. 56 00:04:33,580 --> 00:04:35,290 Then we'll make a deposit. 57 00:04:35,290 --> 00:04:38,670 No need to print that out because it's just an action being performed. 58 00:04:38,740 --> 00:04:40,050 Then I'll make a withdrawal. 59 00:04:40,390 --> 00:04:42,720 So this should be withdrawal I believe. 60 00:04:42,760 --> 00:04:44,110 Let me make sure we match that up. 61 00:04:44,200 --> 00:04:51,660 Withdrawal and then also say withdrawal here so let's save this. 62 00:04:51,660 --> 00:04:54,810 Open this up and run it. 63 00:04:54,940 --> 00:05:00,730 So we'll say Python and I wrote this in my example the PI file saw hit enter and see. 64 00:05:00,750 --> 00:05:04,710 So I have Jose 100 my deposit fifty was accepted. 65 00:05:04,710 --> 00:05:05,530 That makes sense. 66 00:05:05,550 --> 00:05:06,610 My withdrawal was successful. 67 00:05:06,630 --> 00:05:07,260 Seventy five. 68 00:05:07,260 --> 00:05:08,130 That makes sense. 69 00:05:08,310 --> 00:05:11,400 However when I try to withdraw 500 funds were not available. 70 00:05:11,400 --> 00:05:13,010 Which also makes sense. 71 00:05:13,020 --> 00:05:13,460 OK. 72 00:05:13,620 --> 00:05:16,140 That's all you had to do for this project. 73 00:05:16,140 --> 00:05:20,790 Again if you have any questions feel free to post the Q&A for us but hopefully once you're able to view 74 00:05:20,790 --> 00:05:23,680 the solution you can see how everything connects together. 75 00:05:23,700 --> 00:05:26,550 We'll see you at the next lecture where we'll talk about decorator's.