python tutorial for cbse computer science syllabus

The first lesson - Python programming. www.python4cbse.com : complete lessons are available on www.python4cbse.com






hello welcome to Python Tutorial
this is my third lesson in this lesson
we will see how Python

Shell is acting as an interpreter

or how it is acting as a simple
calculator

we can how

expressions here in this interpreter
we can type expressions

the python will calculate the values
and it will

print the result. The expression
syntax is straightforward and it is

simply just like the mathematical

operations we how on a mathematical
operators plus minus the division etc.

and it will work same as

the other languages likes C, C++, Java etc.

parentheses are used for grouping the
expressions

we will see some examples we have to
prepared the expressions

hear on the screen here we have typed

2 plus 2 and press the Enter

we got the answer

4
so it is just like a calculator

if you want to the difference so you can use
minus operator here

here we can type

2 -2 in the prompt area so

two-minus two the answer is 0

and we can try division operator

slash (/) is the division operator used
so we will type

2 / 2 and
get the answer

1.0 here
and next

we work multiplication application operator
for
multiplication are using

star operator in computer programming
languages

so 2 * 2

and press Enter we will get the
answer

2 into 2 is

4 is the answer
answer is four

if you want a little complicated not
that complicated even then

2 * 2 * 4
if you want to have

more calculations like this so
2 * 2 4* 2 is 8

16

so the value is calculated and it is
being displayed here

if you want have express sense so
express with some

preferences priorities of operations we
can use

at parentheses to support that priority of

operation
so the have an expressionhere

50 minus 5 into 6 by 4

so 4 is outside the practices so that
divided by 4 will be

calculated at the end

so fast the ones which are

given in the in brackets
the parentheses

and after that the out side ones
we got the answer it is

5.0 , this way we can use the expressions

expressions in Python
if you want do integer division

in the previous division
we got 1.0

if u want to

sorry if you want a floor values
for example

7//3 // is the operator for

integer division
answer is 2

but if you give 7/3 the normal division

we will be getting the answer 2.33 so the
value

in double slash in the integer division
the value is floored

and we got the answer 2 instead of 2.3

so this is the way of python

interpreters
as it is used as a calculator

we can use almost the operators here

it is in that basic mathematics I
suppose the

explanations the lessons are easy
simple

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