1
00:00:00,090 --> 00:00:03,230
Hello and welcome to this video.

2
00:00:03,270 --> 00:00:14,480
In this video I'm going to briefly explain what Python expressions are what are Python expressions.

3
00:00:14,640 --> 00:00:20,150
An expression is basically anything that has a value.

4
00:00:20,310 --> 00:00:21,780
It could be a number.

5
00:00:21,900 --> 00:00:29,880
He could be a text which is also called a string or it could be adding two numbers together using an

6
00:00:30,030 --> 00:00:38,130
operator saw an expression can contain an operator like three plus four.

7
00:00:38,160 --> 00:00:42,260
The Plus here is an addition operator.

8
00:00:42,510 --> 00:00:46,820
It can also contain or per hand.

9
00:00:46,890 --> 00:00:52,970
The upper hand is basically the actual values like three is an upper hand for.

10
00:00:53,550 --> 00:00:58,000
He's also an upper hand.

11
00:00:58,050 --> 00:01:08,960
Statements are made up of one or more expressions so let me illustrate some basic expression.

12
00:01:08,970 --> 00:01:14,050
I'm going to be using the command prompt on my Windows computer.

13
00:01:14,280 --> 00:01:20,590
If you're on a Mac you can use the terminal when you're on the terminal on the Mac.

14
00:01:20,610 --> 00:01:29,910
You need to type in Python 3 if you're on a window just typing Python press enter and that gives you

15
00:01:29,970 --> 00:01:33,600
access to the Python interactive shell.

16
00:01:34,110 --> 00:01:44,730
So the first expression I want to write here is just to add two numbers together I say three plus four

17
00:01:45,330 --> 00:01:48,880
press enter and I get seven back.

18
00:01:48,930 --> 00:01:56,040
So the beauty of the interactive show it gives you a response to what it is you are typing in.

19
00:01:56,100 --> 00:02:05,460
Let's do another one so they do three times three and presenter okay he's been nine.

20
00:02:06,060 --> 00:02:08,730
Let's do a text this time.

21
00:02:08,760 --> 00:02:11,720
Text is basically also known as a string.

22
00:02:12,390 --> 00:02:18,060
So I can just say hello world.

23
00:02:18,820 --> 00:02:30,250
And if I press enter it gives me back hello world again I can use a variable a variable is something

24
00:02:30,250 --> 00:02:37,690
that stores data so I can create a variable I can say B equals to you use the equals two to assign a

25
00:02:37,690 --> 00:02:38,450
value.

26
00:02:38,650 --> 00:02:53,100
So I can say I want b to store the value of eight sorry value of as a seven plus seven presenter.

27
00:02:53,120 --> 00:03:02,090
Now if I call B B will give me 14 because that's the value of adding seven to seven.

28
00:03:02,090 --> 00:03:09,080
So these are just some basic examples of what an expression is.

29
00:03:09,110 --> 00:03:15,530
So that is it for this brief video on Python expressions.

30
00:03:15,530 --> 00:03:16,730
Thanks for watching.

31
00:03:16,730 --> 00:03:17,510
Bye for now.