Input-Output

Print 'Hello World!'

Method-1

This uses single quotes.

print('Hello World!')

Hello World!

Method-2

This uses double quotes.

print("Hello World!")

Hello World!

Accept string as input

word = input()

input always returns a string, no matter what input is entered.

Input	word
good	'good'
123	'123'
12.3	'12.3'

Accept integer as input

x = int(input())

First accept a string as input and convert it into an integer. This conversion is often called type-casting, since we are changing the type of a variable. Here, it goes from str to int.

Accept float as input

x = float(input())

Similar to the previous how-to.

Print multiple variables

Notice the space that gets added by default between consecutive variables when they are printed. Also note that all get printed on the same line.

Example-1

x = 10
y = 20
z = 30
print(x, y, z)

10 20 30

Example-2

This example demonstrates that the type of objects being printed need not be the same.

name = 'Krishna'
age = 40
salary = 1.5
print(name, 'is', age, 'years old and earns', salary, 'lpa')

Krishna is 40 years old and earns 1.5 lpa

Print multiple objects separated by comma

x = 10
y = 20
z = 30
print(x, y, z, sep = ',')

10,20,30

sep is an parameter of the function print and stands for separator. The separator is a string that is added between consecutive objects before printing them. The separator defaults to a space, ' '. In order to separate objects with a comma, sep has to be set to ','.

Print multiple objects without separation

year = '22'
term = 'f3'
roll = '001023'
domain = '@ds.study.iitm.ac.in'
print(year, term, roll, domain, sep = '')

22f3001023@ds.study.iitm.ac.in

Note that the argument passed to sep is the empty string, ''. This is often called the null string.

Print multiple sentences using a single string

Method-1

Using triple quotes is a way to store multi-line strings.

sentences = '''this is sentence 1
this is sentence 2
this is sentence 3'''
print(sentences)

this is sentence 1
this is sentence 2
this is sentence 3

Method-2

This uses the '\n' or the newline character that introduces a new line.

sentences = 'this is sentence 1\nthis is sentence 2\nthis is sentence 3'
print(sentences)

this is sentence 1
this is sentence 2
this is sentence 3

'\n' is a single character. To see this:

char = '\n'
print(len(char))

1