1
00:00:00,600 --> 00:00:05,280
Okay, first thing's first, I'm gonna wipe
our all these instructional columns.

2
00:00:05,280 --> 00:00:08,800
Let's get rid of all of these,
clean that up a bit.

3
00:00:08,800 --> 00:00:11,480
Let's get a little noisy.

4
00:00:11,480 --> 00:00:13,230
All right, awesome.

5
00:00:13,230 --> 00:00:15,620
So, that feels better.

6
00:00:15,620 --> 00:00:18,042
Let's look at what we have left.

7
00:00:18,042 --> 00:00:21,300
All right so we left done here because
we want to print the list out in

8
00:00:21,300 --> 00:00:22,162
totality when it's done.

9
00:00:22,162 --> 00:00:25,370
We wanna show the list and
there's this one here too.

10
00:00:25,370 --> 00:00:28,740
I wanna see the list any time so
I can verify my order.

11
00:00:28,740 --> 00:00:31,250
So let's make a new command for that.

12
00:00:31,250 --> 00:00:32,320
That sounds good, all right?

13
00:00:32,320 --> 00:00:33,970
So let's come back over here.

14
00:00:33,970 --> 00:00:36,930
So first,
I'm gonna clean this up a little bit.

15
00:00:36,930 --> 00:00:41,510
I'm gonna move this add to list
down below the show help and

16
00:00:41,510 --> 00:00:44,550
typically what happens
in between functions,

17
00:00:44,550 --> 00:00:48,220
you'll see that the starts getting
busy is you leave two spaces.

18
00:00:48,220 --> 00:00:52,820
So there we, so we left that two
spaces between the two there.

19
00:00:52,820 --> 00:00:55,060
Before and after, there you go.

20
00:00:55,060 --> 00:01:03,250
All right, so we want to define a new
function that's named show list.

21
00:01:03,250 --> 00:01:03,970
So let's do that.

22
00:01:03,970 --> 00:01:10,049
So we'll say, define a function

23
00:01:10,049 --> 00:01:15,478
named show_list that prints

24
00:01:15,478 --> 00:01:20,260
all the items in the list.

25
00:01:21,750 --> 00:01:23,200
That sounds good, right?

26
00:01:23,200 --> 00:01:24,680
You got this, right?

27
00:01:24,680 --> 00:01:27,380
You can loop through all of them and
print them out, right?

28
00:01:27,380 --> 00:01:28,960
You got this, right?

29
00:01:28,960 --> 00:01:31,700
Pause me.
How did it go?

30
00:01:31,700 --> 00:01:32,700
Here's how I did it.

31
00:01:32,700 --> 00:01:36,014
So I said def show list.

32
00:01:40,551 --> 00:01:45,620
Here's your list,
nice little heading there for it.

33
00:01:45,620 --> 00:01:48,090
And we're gonna loop through that list.

34
00:01:48,090 --> 00:01:55,500
So for each of the items In the shopping
list, we are going to print said item.

35
00:01:56,810 --> 00:02:04,780
Awesome, and now,
we want to be able to have this called.

36
00:02:04,780 --> 00:02:08,100
So let's make the command SHOW,
in all upper case.

37
00:02:08,100 --> 00:02:09,628
So let's put it right here.

38
00:02:09,628 --> 00:02:16,300
We'll say Enable the SHOW command,

39
00:02:16,300 --> 00:02:20,315
cuz we wanna call that function
SHOW command to show the list.

40
00:02:22,540 --> 00:02:25,360
Don't forget to update
the help documentation.

41
00:02:26,930 --> 00:02:27,710
This is super important.

42
00:02:27,710 --> 00:02:29,480
Sometimes you'll add a new command and

43
00:02:29,480 --> 00:02:31,370
you'll forget that you've
already made this help.

44
00:02:31,370 --> 00:02:35,380
And we have the help at the top of
the file, so don't forget to do that and

45
00:02:35,380 --> 00:02:38,070
I wanna drop a hint here for you.

46
00:02:38,070 --> 00:02:41,280
Make sure to run it.

47
00:02:41,280 --> 00:02:44,790
Make sure that you run this
after you had that show command.

48
00:02:44,790 --> 00:02:46,970
There's a little gotcha
if you forget something.

49
00:02:46,970 --> 00:02:50,170
So make sure you run it, and
just make sure your list looks right.

50
00:02:50,170 --> 00:02:50,880
Are you ready?

51
00:02:50,880 --> 00:02:52,180
Pause me.

52
00:02:52,180 --> 00:02:53,200
Did you catch it?

53
00:02:53,200 --> 00:02:54,640
Here's what I did.

54
00:02:54,640 --> 00:02:57,940
So I went ahead and it's another else if.

55
00:02:57,940 --> 00:03:04,070
And if this is equal to our command
of show, we call the function.

56
00:03:05,510 --> 00:03:09,642
But we got to remember to
use our control flow, right?

57
00:03:09,642 --> 00:03:11,310
We gotta call continue and

58
00:03:11,310 --> 00:03:16,100
if not, what will happen is show
will end up in your grocery list.

59
00:03:16,100 --> 00:03:18,650
When you embrace flow control
like break and continue,

60
00:03:18,650 --> 00:03:21,740
it's super important that you pay
attention to all the used cases.

61
00:03:21,740 --> 00:03:24,630
All right, we are so close to done.

62
00:03:24,630 --> 00:03:27,970
Now, we need to show
the list on completion.

63
00:03:27,970 --> 00:03:32,060
So what we can do is when this while
loop is over while this while true when

64
00:03:32,060 --> 00:03:32,700
this is over.

65
00:03:34,000 --> 00:03:34,660
We can just call it.

66
00:03:38,026 --> 00:03:43,300
We will call show_list.

67
00:03:43,300 --> 00:03:45,820
Awesome let's give that a run.

68
00:03:45,820 --> 00:03:51,700
Let's say, Python shopping list.

69
00:03:55,150 --> 00:03:57,330
Look what I forgot to do.

70
00:03:57,330 --> 00:03:59,740
I didn't update the help,
so I don't know about show.

71
00:03:59,740 --> 00:04:00,340
I'm gonna do that.

72
00:04:00,340 --> 00:04:01,750
Let me get back up in there.

73
00:04:01,750 --> 00:04:03,000
Let's go back up in here.

74
00:04:04,220 --> 00:04:08,890
So we'll add enter SHOW

75
00:04:11,270 --> 00:04:15,300
to see your current list.

76
00:04:15,300 --> 00:04:17,610
Awesome, whew that was close.

77
00:04:18,930 --> 00:04:22,920
Okay so
we're gonna run Python shopping_list.py.

78
00:04:24,600 --> 00:04:28,030
There's the show which
we pick up at the store.

79
00:04:29,450 --> 00:04:31,590
Well obviously we need some tortillas.

80
00:04:33,370 --> 00:04:35,190
Let's get some green chiles.

81
00:04:38,620 --> 00:04:39,540
I need pork shoulder.

82
00:04:41,980 --> 00:04:42,950
What am I forgetting?

83
00:04:42,950 --> 00:04:44,370
What's on my list again?

84
00:04:44,370 --> 00:04:46,480
What do I have here?

85
00:04:46,480 --> 00:04:49,870
Right, tortillas, green chiles,
pork shoulders, cilantro.

86
00:04:52,400 --> 00:04:54,770
There we go and now I am DONE.

87
00:04:54,770 --> 00:04:57,835
And check it out there is my final list,

88
00:04:57,835 --> 00:05:01,710
you're totally invited to my taco fiesta,
look at this.

89
00:05:01,710 --> 00:05:05,981
We are all done, awesome.

90
00:05:06,990 --> 00:05:09,080
Should we walk it one more time?

91
00:05:09,080 --> 00:05:10,220
Let's do that.
So I'm gonna come in here.

92
00:05:10,220 --> 00:05:14,290
I'm gonna get rid of these instructional
commands that we have in here.

93
00:05:16,850 --> 00:05:18,070
Let's just walk it.

94
00:05:18,070 --> 00:05:24,740
So we create our brand new list that
the program will use in a global fashion.

95
00:05:24,740 --> 00:05:28,130
And then our program is gonna
accept multiple commands.

96
00:05:28,130 --> 00:05:30,140
So we should have some detailed help,
right?

97
00:05:30,140 --> 00:05:32,548
Programs are no good if
users can't use them.

98
00:05:32,548 --> 00:05:38,210
So we print out our help, and
then we have our add to list function.

99
00:05:38,210 --> 00:05:41,850
And it appends a value to
the end of our shopping list and

100
00:05:41,850 --> 00:05:45,140
updates the user with the count.

101
00:05:45,140 --> 00:05:46,970
And lists and most objects for

102
00:05:46,970 --> 00:05:51,260
that matter can make use of
the lean command, so pythonic.

103
00:05:52,350 --> 00:05:57,212
And then we have our show list,
and lists are iterable,

104
00:05:57,212 --> 00:06:01,690
so we can loop through them
with a four item in list.

105
00:06:01,690 --> 00:06:05,170
Now, this is kind of strange, right?

106
00:06:05,170 --> 00:06:07,540
So we have this while True.

107
00:06:07,540 --> 00:06:10,610
One way to write loop that take
many flows is to set things up

108
00:06:10,610 --> 00:06:12,500
in an infinite loop matter.

109
00:06:12,500 --> 00:06:14,660
While true is always gonna happen,

110
00:06:14,660 --> 00:06:19,100
we rely on further control flow
to control how things happen.

111
00:06:20,230 --> 00:06:24,390
We take a single prompt and
since it can be an item or

112
00:06:24,390 --> 00:06:27,600
a command,
we have made the prompt generic.

113
00:06:27,600 --> 00:06:30,570
A little greater than sign,
feels kinda good.

114
00:06:30,570 --> 00:06:33,210
And then we just check
each of our commands.

115
00:06:33,210 --> 00:06:36,650
So here's the flow if the user is done.

116
00:06:38,120 --> 00:06:41,460
Break out of the while loop,
we are done with this while loop,

117
00:06:41,460 --> 00:06:44,090
we don't anything more to do so
break out of it.

118
00:06:44,090 --> 00:06:50,390
Otherwise if we're looking for help,
show it and remember to control the flow.

119
00:06:51,510 --> 00:06:56,660
Calling continue will shoot us back up to
this while true line which is no surprise,

120
00:06:56,660 --> 00:06:58,030
still true.

121
00:06:58,030 --> 00:07:02,350
What this avoids is us from continuing and
adding help to our grocery list.

122
00:07:02,350 --> 00:07:03,510
We don't want that.

123
00:07:03,510 --> 00:07:05,560
Well, at least not from the grocery store.

124
00:07:05,560 --> 00:07:10,440
Now, I of course, could have just put this
add to list inside of an else and we could

125
00:07:10,440 --> 00:07:14,360
remove the continues, but then I would've
been able to show you the continue loop.

126
00:07:14,360 --> 00:07:18,890
So I want you to be cautious of
controlling the flow with break and

127
00:07:18,890 --> 00:07:19,930
continue.

128
00:07:19,930 --> 00:07:21,670
Break is known to break your program,

129
00:07:21,670 --> 00:07:26,650
and then finally we add that
new item to our function.

130
00:07:26,650 --> 00:07:29,810
It comes into the add to list then boom,
here we go.

131
00:07:29,810 --> 00:07:32,370
So I hope that that all made sense, and

132
00:07:32,370 --> 00:07:36,950
if there is anything at all that is still
confusing you, feel free, rewind it,

133
00:07:36,950 --> 00:07:40,740
watch it again and hit the forum if
there's anything confusing at all.

134
00:07:40,740 --> 00:07:43,060
You did an awesome job,
enjoy the taco party.