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[no audio]

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Friends, here

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We are going to discuss the first two operators of your Python.

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They are arithmetic and assignment operators. First

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let me go with your arithmetic operators.

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See we have different types of arithmetic operators.

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They are like, you know already we know in your mathematics -

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addition, subtraction, multiplication, division, modulo.

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Right. So here floor division is somewhat a new one,

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we will see that, and then exponential. So these all are

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your arithmetic operators, right.

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Let me open my Python terminal. There

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I can easily explain about them.

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[no audio]

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Let me enter into my Python terminal, Python command line, or

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Python Shell.

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So guys, directly I can do suppose 2 + 2,

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I mean any number you can take, not only 2 + 2, some

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4 + 2, right.

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So this is just to perform addition of two values.

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Right. So I can store this result into some variable as well.

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Let's say 'result=', or we can take any variable, addition

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of two numbers, something like that or simply 'sum=',

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or 's='. Variable is your wish, right. Now just print your 's'.

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Yes, you are getting. Right. Not only like that,

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just you can store your values in some variables.

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And let me take 'c= a + b', and then print your 'c'.

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So likewise, you can do your subtraction, multiplication, right?

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Let me do one thing, 'c = a - b'.

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So 'a' is 4, and 'b=8', the result is -4.

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Now let's say 'c = a * b'

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Now 'c' is 32.

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Right. Now, let me do one more thing 'c=

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if I take 4/8, right result is 0.5.

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[no audio]

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You know, right 4/8 result is, otherwise you just

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do 8/4.

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Then see the result, 2.0.

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Okay. See guys, by default you are getting your result

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in terms of float.

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So this is with your Python 3, but if you go with Python 2

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if any one of the value is

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[no audio]

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float, then only

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you will get result as float number.

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Right. Anyway, we are working with Python 3.x, right and we

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know this is the future version.

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I mean from 2020 we have to use this one, right. Fine.

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Now, let me do, don't worry about this line guys.

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Just I am going to clear my screen.

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[no audio]

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Fine. Now, exponential. Suppose if I want to find something

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like 3² or some 4³, how you can find.

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See 3², you can write 3**2. Now this

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is nothing but 3². The result is 9. Of course, you can

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store your values into, let's say 'a=5', and

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'b=3'. Now if I want to find a^5, a*, sorry

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a^b or 5³

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[no audio]

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or 5³, right, a³.

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I can do either in this way or this way.

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Just after the result, 125.

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I can store that into some variable called 'result', or any

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variable. Let's say, a**b. Now simply print your

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'result', and see the value.

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[no audio]

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Right. Now if you observe we covered all the operations,

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yeah, we have pending with modulo and then we'll see

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floor division. So modulo.

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Let me take some number guys. Suppose

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I am going to take some 7, if I want to divide this with

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2. 2*3, just 6. Now

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what is the remainder value, 1. Right. Now see what I am doing

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is 7%2, result is 1. Likewise suppose if you

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divide 8 with 2, then what is the remainder?

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So 8%2 is always 0, we know that.

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Just to find your reminder

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you're using '%' symbol. Then the last one is

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floor division, right. See that. Right. Nothing is there. Just take two

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times your '/', or division symbol. See the result. 4, right.

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Now what I'm doing is, now see the 'result'.

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By default if you take 7 by 2 what you were getting, 3.5.

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If you do floor division,

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[no audio]

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right, if you do floor division. See,

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yeah, simply assume that in this output only, in this explanation

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two threes are six,

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[no audio]

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reminder 1. Your quotient is 3. You

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will get this pure quotient without your floating points.

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Right, and that too you can assume 3.5 actually, no. 7/6, or

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if you do your 7

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reminder 2. What is the value?

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Sorry, 7/2, what is the value? 3.5. Then if you round off

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that value to lower value then the result is 3. So that

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is what you are getting.

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[no audio]

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Let's say 9.

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Let's say -9//2.

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See what you are going to get. You're going to get -5

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because 9/2 is almost 4.5, -4.5.

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Right. See in your number system

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this is -5, then -4.

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So compared to -4, -5 is the lower value. Now, whatever

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the result you are getting for that result

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you are getting round of value that to lowest round of value.

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That's why I -4.5 round of value as a lower value is

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always -5. That's what you are getting here.

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So that is the uses of your floor division.

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[no audio]

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Right. Fine.

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Then next one is, assignment operator. See already

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we know one of the assignment operator like if I

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write 'x=2', what you are doing?

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[no audio]

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2 value you are assigning to 'x'.

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[no audio]

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Okay. Suppose I can do 'x = 2 + 4', then guys

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whenever you have a '=' symbol here, '=' operator here,

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for this '=' operator always the right side whatever you

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have that expression will be evaluated first,

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then that result will be assigned to 'x'.

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See, whatever the expression you have with the help of '='

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symbol, let's say 'x=3x + 2'

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[no audio]

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Assume 'x' equals to some 3 value.

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So your Python don't bother about here 'x' is there, here 'x'

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is there. Your Python don't bother about that first.

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It will take '=' symbol, then it will forget about this.

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Whatever is there on right side, first that value will be evaluated,

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and that result will be assigned to this variable.

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So 'x' is 3. 3 * 3, 9. 9 + 2 is 11. 11

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will be assigned to 'x'. If you want to get that result from your command

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line, let me take 'x=3'. Then I am writing

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'x=x*3', or '3x', '+', some 2. Now see the result 'x' value.

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11, right?

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So that is simply assignment operator or your '=' symbol is

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basically an assignment operator, but see whenever if you

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write 'a=a+b',

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[no audio]

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and observe that here 'a' is there, here also 'a' is there. So in this

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case instead of writing your expression, lengthy expression,

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you can also write as a shortcut expression as in this way

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'a+=b'.

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[no audio]

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Not only for this, if you observe

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all these things, right, see 'a' is there, 'a' is there, 'a' is there, 'a'

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is there, so on both the sides for your '=' symbol whenever

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if you have 'a', right, then at the time what you

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can do is just remove this 'a', and then write '+' before

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your '=' symbol.

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Right. That's what I did here.

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[no audio]

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Now these both, two expressions are going to give same result.

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So if you want to get the proof just open your terminal.

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So here let me take initially 'a=' some 2, and 'b='

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some 3 value. If I write 'a=a+b', what

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is the result? Just observe that. 5. Now, I am going to reassign

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'a=2', and then 'b=3'.

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Now, what I am doing is 'a+=b' and see the result.

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That means if you write

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either this expression or shortcut expression both will give

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same result.

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[no audio]

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Right. So these are all the assignment operators, and about your

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arithmetic operators as well, okay.

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Okay, and one more thing, so guys, suppose if you want to define

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a simple arithmetic calculator.

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Let me do it here.

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[no audio]

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So I am going to design simple arithmetic calculator with

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the help of only addition symbol for time being because you

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can perform any operation, for time being

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I am going to create only addition arithmetic calculator,

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okay, otherwise simply

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'addit_cal.py'.

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[no audio]

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Just observe here guys.

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What I am going to do is, suppose if I take 'a' equals to some 3,

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and 'b' equals to some 5, and I want to find the 'result', 'result='

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nothing but 'a+b', and I can print, using 'f' string

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I can print

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"The addition of and =", or "is ". Right. See guys, if

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this is your Python Script or Python program in this you

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have four lines.

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See for any line if you observe there is no space at starting,

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that is the rule of your Python, that is the basic rule for your

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Python, don't provide a space before starting any line until

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and unless if there is any special requirement for that. As

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of now all are normal lines, straight forward, straight lines.

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Right. That's why I'm not giving any space before starting your

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any of the lines.

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Right. And whenever if you run, your Python will run your program

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from top to down line by line.

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[no audio]

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Then what is the very first line? 'a=3'. That means

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somewhere in memory 'a' value will be assigned as 3. Same

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way 'b', then 'result'. You know 'a + b', is the addition. So

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'a' value is 3 and 'b' value is 5. 3 + 5, 8, you are assigning to

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'result'. Then you are printing those values, right?

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That's what we are doing here.

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Now let me save it and run it.

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[no audio]

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So I am going to save it, and you know how to run your Python

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script or program from command line,

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simply your python interpreter space your program name.

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That's what I am doing here.

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See, "The addition of 3 and 5 is 8", you are getting.

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But if I run this program again, and again, I am going to

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get same result. If it is addition calculator it should not

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give the addition for fixed numbers. Whenever if you are running

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that script, that program it has to take two values minimum from the user.

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You know whenever if you want to provide input for your script,

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you have a command or statement called 'input' in your Python,

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in Python 3.x.

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Let me open our script.

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[no audio]

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See here, instead of fixing my values to 'a = 3', and

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'b = 5',

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what I am going to do is, let me comment these two lines. Now

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'a' value read from 'input'.

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So 'eval' is used to evaluate your given value.

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So "Enter first number". So this is just info you know already

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about your 'input'. Then same way

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I want to get 'b' value from 'input'. So

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'input(Enter second number")'

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[no audio]

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That's it. Right. Now

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let me save this and see your code once whatever you have.

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Right. So guys if you

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observe here, first two lines are commented, that means

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your Python won't consider those two lines as your Python

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program lines.

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[no audio]

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Now very first line is this one.

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So whenever if you run top to down, you know that, the very

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first line is 'a=2'. We know whenever there is an

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'=' symbol, that is an assignment operator. Whenever if you

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have an assignment operator, assignment operator will try

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to get first right side value, whatever you have.

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Now, in right side you have some syntax,

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this is helpful to read something from command line.

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So whatever I am going to provide on command line that will

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read by this expression and that value will be assigned to

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'a' by your '=' symbol, or with your assignment operator. Right.

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Let me run our code whatever we have. See that, "Enter the first

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number". I am entering number 6, suppose. Then immediately in

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the second line, right, you have once again "Enter second number".

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And so because of this "Enter first number", I am entering

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6, then I'm going to press 'Enter' on my keyboard so that

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this 6 will go and store into 'a' with the help of this expression,

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this syntax, right. Then immediately in the next line

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we have "Enter your second number".

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I am going to enter suppose something number called 9.

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That's it. You're getting 6, 9, "result is 15". Now,

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your program is like, you know simple addition calculator.

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[no audio]

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Right.

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[no audio]

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But after doing some advanced level concepts you can

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design a simple arithmetic calculator with your Python, that

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means addition, subtraction, multiplication, division, modulo,

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floor division, whatever the operator, whatever the operation

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you need all those operations

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you can do with the help of your Python scripting. So for

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that you need to include some logic, before including some

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logic you should know some concepts. We'll discuss that concepts

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first, and then we will once again design a full-fledged

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arithmetic calculator with help of

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your Python Scripting. Okay, for time being this is very simple

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one. Okay, so guys here we discussed about arithmetic operators

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and assignment operators, and also how to read any two numbers,

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and then how to find addition. The same way

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you can try for your addition, subtraction, multiplication,

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division, modulo, floor division, and exponential. You just try.

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Write a separate Python Script for each and every concept

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here whatever we have.

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[no audio]

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Right. Fine.

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Okay guys, thank you for watching this video.

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[no audio]