Introduction to python(Installation of python,Python libraries,ASCII values,input and output statements)

 

  

                                     

Installation of python:

Python is installed from c:\python27

Path variable has to be set in python file, inorder to run the program.

Python features:

• Python is very supportive for data analytics.
• It has general public licence (GPL).
• It is a scripting language.
• It is an object oriented programming language.
• It is an open source language.

Python libraries:

• NLP package.
• PIL(Python Image Library).
• Math

Functions:

1)print()

Use:It is used to print a statement or variable.

Example:

print ("hello world")

Output:

hello world

2)Data types:

• int

          It includes all integers.eg.5,9,23 etc

• float

          It includes all decimal values.eg. 2.7 ,4.0 etc

• str

          It includes a group of alphabets.eg. hello ,won etc

3) type ()

Use:It is used to declare the data type.

Example:

X=3.0

Y=5

Z=X+Y

A=hello

print (type(X))

print (type(Y))

print (type(A))

Output:

Float

Int

String

4)type conversion:

The expression of one data type on other is called type conversion.

Example:

a=65

b=3.2

print (float(a))

print (int(b))

print (str(a))

Output:

65.0

3

A(ASCII code of A is 65)

ASCII :

A-65     

B-66

C-67

D-68

E-69

F-70

G-71

H-72

I-73

J-74

K-75

L-76

M-77

N-78

O-79

P-80

Q-81

R-82

S-83

T-84

U-85

V-86

W-87

X-88

Y-89

Z-90

Zero-47

Space-30

5)input()

Use: It is used to provide input.

Example:

X=int(input())

print (X)

Output :

In this case we have to give the input and the input we give will be be printed as output.

6)raw_input()

It reads the input or command and returns a string.

Whereas input() reads the input and returns a python type like list ,tuple,int etc.