CBSE Class 11: Python Fundamentals 6

Python Output Using print() function

We use the print() function to output data to the standard output device (screen).

Example:
print(‘This sentence is displayed on the screen’)
# Output: This sentence is displayed on the screen

 

In print() function string can be written in both single quotes and double quotes

In print() string can be written with in single quotes (‘hello’)

a = 5
print(‘value of a = ‘, a)
#Output:
value of a = 5

 

In print() string can be written with in single quotes (“hello”)

a=10
print(“Value of a = “,a)

# Output:
Value of a = 5

 

The actual syntax of the print() function is

Syntax:
print(*objects, sep=’ ‘, end=’\n’, file=sys.stdout)

Here,
objects is the value(s) to be printed.

The sep separator is used between the values. It defaults into a space character.

After all values are printed, end is printed. It defaults into a new line.

The file is the object where the values are printed and its default value is sys.stdout (screen).

Examples:

>>>print(1,2,3,4)
#Output: 
1 2 3 4

>>>print(1,2,3,4,sep=‘*’)
#Output: 
1*2*3*4

>>>print(1,2,3,4,sep=‘#’,end=‘&’)

#Output: 
1#2#3#4&

Output formatting

Sometimes we would like to format our output to make it look attractive. This can be done by using the str.format() method. This method is visible to any string object.

>>> x = 5; y = 10
>>> print(‘The value of x is {} and y is {}’.format(x,y))
The value of x is 5 and y is 10

Here the curly braces {} are used as placeholders. We can specify the order in which it is printed by using numbers (tuple index).

>>>print(‘I love {0} and {1}’.format(‘bread’,’butter’))
#Output: 
I love bread and butter

>>>print(‘I love {1} and {0}’.format(‘bread’,’butter’))
#Output: 
I love butter and bread

We can even use keyword arguments to format the string.

>>>print(‘Hello {name}, {greeting}’.format(greeting = ‘Goodmorning’, name = ‘Amit’))
#Output:
Hello Amit, Goodmorning

We can even format strings like the old sprintf() style used in C programming language. We use the % operator to accomplish this.

>>> x = 12.3456789
>>> print(‘The value of x is %3.2f’ %x)
#Output:
The value of x is 12.35

>>>print(‘The value of x is %3.4f’ %x)
The value of x is 12.3457

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