READING THE DATA FROM KEYBOARD IN PYTHON

We can read the data from keyboard by using following functions.

1. raw_input() - It reads the data from the keyboard in the form of string format.

Example - 

x=raw_input('enter no : ')

print x

print type(x)

Output - 

enter no : 10

10

<type 'str'>

Type conversion functions

These are used to convert one datatype represented data in the form of another datatype.

• int() - Converts the string represented data in the form of int format.

PROGRAM TO PERFORM ADDITION OF TWO NUMBERS BY READING THOSE NUMBERS FROM KEYBOARD USING raw_input()

i=raw_input('enter num1 : ');

j=raw_input('enter num2 : ');

print type(i)

print type(j)

print i+j

i=int(i) 

print type(i)

print i

j=int(j)

print type(j)

print j

print i+j

Output -

enter num1 : 10

enter num2 : 20

<type 'str'>

<type 'str'>

1020

<type 'int'>

10

<type 'int'>

20

30

Shortcut - print int(raw_input('enter num1 : '))+int(raw_input('enter num2 : '))

• long() - It is used to convert the string represented data in the form of long data type format.

Example -

x=raw_input('enter longnum : ');

print type(x)

print x

y=long(x)

print type(y)

print y

Output - 

enter longnum : 123456789012345

<type 'str'>

123456789012345

<type 'long'>

123456789012345

• float () - It is used to convert string represented data in the form of float datatype format.

Example -

x=raw_input('enter floatnum : ');

print type(x)

print x

y=float(x)

print type(y)

print y

Output -

enter floatnum : 123.123

<type 'str'>

123.123

<type 'float'>

123.123

• complex() - It is used to convert the string represented data in the form of complex datatype format.

Example - 

x=raw_input('enter complexnum : ');

print type(x)

print x

y=complex(x)

print type(y)

print y

Output - 

enter complexnum : 2+4j

<type 'str'>

2+4j

<type 'complex'>

(2+4j)

• bool() - It is used to convert the string represented data in the form of bool datatype format.

Example -

x=raw_input('enter bool : ');

print type(x)

print x

y=bool(x)

print type(y)

print y

Output -

enter bool : TRUE

<type 'str'>

TRUE

<type 'bool'>

True

2. input() - It is used to read data from keyboard directly in our required format.

Example -

i=input('Enter int no ')

print type(i)

print i

j=input('Enter long no ')

print type(j)

print j

k=input('Enter float no ')

print type(k)

print k

x=input('Enter complex no ')

print type(x)

print x

y=input('Enter bool no ')

print type(y)

print y

Output -

Enter int no 123

<type 'int'>

123

Enter long no 12345678901234

<type 'long'>

12345678901234

Enter float no 123.123

<type 'float'>

123.123

Enter complex no 5+4j

<type 'complex'>

(5+4j)

Enter bool no True

<type 'bool'>

True