1 00:00:05,280 --> 00:00:08,000 In the last video, I'd selected option four, 2 00:00:08,000 --> 00:00:12,160 and we got the list of ingredients for an egg sandwich. And you can see that on screen here. 3 00:00:12,160 --> 00:00:16,400 If you've been experimenting, to make sure you understand how a display_dict 4 00:00:16,400 --> 00:00:21,680 and the recipes menus are working together, then run the program and choose option 4. 5 00:00:21,680 --> 00:00:27,450 At the moment, the program just prints out the list. We've got egg, butter and bread in the output. 6 00:00:27,450 --> 00:00:33,360 The next step is to check our pantry dictionary. If you want to make an egg sandwich, then we'll need 7 00:00:33,360 --> 00:00:39,840 all these three ingredients; egg, bread and butter. All we have to do is iterate over this list, 8 00:00:39,840 --> 00:00:45,760 and see if each item is in the pantry dictionary. I'm not going to set that as a challenge, but if you 9 00:00:45,760 --> 00:00:51,040 want to try that yourself, then pause the video, and come back when you're ready to see my code. 10 00:00:51,040 --> 00:00:56,279 Alright, so we're going to start now by iterating over the items in the list. 11 00:00:57,600 --> 00:01:03,600 So line 25, I'm going to tab over there, and at the same indentation level, I'm going to type for 12 00:01:03,600 --> 00:01:11,827 food_item in ingredients colon. So that'll give us each of the ingredients, in turn. 13 00:01:11,827 --> 00:01:15,840 So checking if we've got each ingredient is easy. We've seen how to check if something is 14 00:01:15,840 --> 00:01:25,600 in a dictionary, so let's do the same. So it's if food_item is in pantry colon. 15 00:01:25,600 --> 00:01:32,720 At the moment we'll print a message out - parentheses f double quotes backslash t. Then we're going to 16 00:01:32,720 --> 00:01:40,002 put food item in curly braces, and outside of the curly brace we'll just put OK. Then we'll just close the line. 17 00:01:40,002 --> 00:01:47,074 And we'll put an else here colon and the print parenthesis f double quotes, backslash t again 18 00:01:47,074 --> 00:01:53,440 for a tab character, and we'll put a message here: You don't have the necessary ingredient - 19 00:01:53,440 --> 00:01:57,000 or have a necessary ingredient, would be better. 20 00:01:58,080 --> 00:02:02,880 And we'll put food item in curly braces again, 21 00:02:02,880 --> 00:02:06,306 and that's the end of the line. 22 00:02:07,200 --> 00:02:12,080 Alright, so I've put a tab character at the start of the output, as you saw me do on lines 27 and 29. 23 00:02:12,080 --> 00:02:15,600 That's going to make it easy to see in the output, and we'll see that shortly. 24 00:02:15,600 --> 00:02:19,120 There shouldn't be anything else you don't understand in that last bit of code. 25 00:02:19,120 --> 00:02:24,582 If the item is in the pantry dictionary - that's line 26 - then we print that it's okay. 26 00:02:24,582 --> 00:02:27,392 Otherwise, we print a message saying we don't have any. 27 00:02:27,392 --> 00:02:33,443 So let's run the program again now. We're going to item four. 28 00:02:34,480 --> 00:02:39,935 We'll scroll this over a little bit so we can see the whole output. So egg is okay, as you can see there, 29 00:02:39,935 --> 00:02:45,902 but we haven't got any bread or butter. Let's try beans on toast instead - number five. 30 00:02:46,800 --> 00:02:50,160 Well that's not going to be very filling, we don't have any beans or bread. 31 00:02:50,160 --> 00:02:56,302 I have to be more adventurous with my dinner. How about chicken and chips? Let's choose option two. 32 00:02:56,939 --> 00:03:03,840 Okay, so we've got chicken. Unfortunately we don't have any potatoes to make the chips. We also don't 33 00:03:03,840 --> 00:03:10,397 have any salt or vinegar. Now why anyone would put vinegar on chips is beyond me. it's certainly a British thing. 34 00:03:10,397 --> 00:03:13,760 You're free to modify the recipes, by the way, if you'd like something like mayonnaise 35 00:03:13,760 --> 00:03:18,800 or ketchup instead. Alright, this point in time, I'm hungry so I'm going to get desperate - 36 00:03:18,800 --> 00:03:24,320 time for choosing option six, or to choose option six; Spam a la tin. 37 00:03:24,320 --> 00:03:28,160 And we don't have a tin opener or a spoon. I must say, I'm not very disappointed. 38 00:03:28,160 --> 00:03:34,718 Despite the posh name, Spam a la tin doesn't sound very appetizing. If I've remember the options I've chosen, 39 00:03:34,718 --> 00:03:40,881 that leaves Butter chicken or pizza. Option 3 for pizza is OK - let's choose that. 40 00:03:41,760 --> 00:03:46,109 You can see that's OK, and option 1 for butter chicken should be as well. 41 00:03:46,109 --> 00:03:49,680 So as you can see, the program has gone through all the ingredients for butter chicken, 42 00:03:49,680 --> 00:03:54,247 and checked that they're available. Strangely, the butter chicken recipe doesn't need butter, 43 00:03:54,247 --> 00:04:01,120 which is good because we haven't got any. Alright, so let's terminate the program now by entering zero. 44 00:04:01,120 --> 00:04:04,240 Alright, so this program is very good at telling us what we don't have, 45 00:04:04,240 --> 00:04:08,400 but not very good at telling us what to do about it. It also doesn't check how much of 46 00:04:08,400 --> 00:04:13,510 an ingredient we have, nor how much we need. We only have two lemons in the pantry, but that's 47 00:04:13,510 --> 00:04:17,454 no good if a recipe needs three of them. We'll continue developing this program. 48 00:04:17,454 --> 00:04:21,786 In the next video, we'll start by checking how much of each item, a recipe needs. 49 00:04:21,786 --> 00:04:23,840 See you in the next video.