Operator Functions in Python | Set 2

• Difficulty Level : Easy
• Last Updated : 23 Feb, 2021

More functions are discussed in this article.

1. setitem(ob, pos, val) :- This function is used to assign the value at a particular position in the container. 
Operation – ob[pos] = val

2. delitem(ob, pos) :- This function is used to delete the value at a particular position in the container. 
Operation – del ob[pos]

3. getitem(ob, pos) :- This function is used to access the value at a particular position in the container. 
Operation – ob[pos]
 

• Python

# Python code to demonstrate working of 

# setitem(), delitem() and getitem()

# importing operator module 

import operator

# Initializing list

li = [1, 5, 6, 7, 8]

# printing original list 

print ("The original list is : ",end="")

for i in range(0,len(li)):

    print (li[i],end=" ")

print ("\r")

# using setitem() to assign 3 at 4th position

operator.setitem(li,3,3)

# printing modified list after setitem()

print ("The modified list after setitem() is : ",end="")

for i in range(0,len(li)):

    print (li[i],end=" ")

print ("\r")

# using delitem() to delete value at 2nd index

operator.delitem(li,1)

# printing modified list after delitem()

print ("The modified list after delitem() is : ",end="")

for i in range(0,len(li)):

    print (li[i],end=" ")

print ("\r")

# using getitem() to access 4th element

print ("The 4th element of list is : ",end="")

print (operator.getitem(li,3))

Output: 
 

The original list is : 1 5 6 7 8The modified list after setitem() is : 1 5 6 3 8The modified list after delitem() is : 1 6 3 8The 4th element of list is : 8

4. setitem(ob, slice(a,b), vals) :- This function is used to set the values in a particular range in the container. 
Operation – obj[a:b] = vals

5. delitem(ob, slice(a,b)) :- This function is used to delete the values from a particular range in the container. 
Operation – del obj[a:b]

6. getitem(ob, slice(a,b)) :- This function is used to access the values in a particular range in the container. 
Operation – obj[a:b]
 

• Python

# Python code to demonstrate working of 

# setitem(), delitem() and getitem()

# importing operator module 

import operator

# Initializing list

li = [1, 5, 6, 7, 8]

# printing original list 

print ("The original list is : ",end="")

for i in range(0,len(li)):

    print (li[i],end=" ")

print ("\r")

# using setitem() to assign 2,3,4 at 2nd,3rd and 4th index

operator.setitem(li,slice(1,4),[2,3,4])

# printing modified list after setitem()

print ("The modified list after setitem() is : ",end="")

for i in range(0,len(li)):

    print (li[i],end=" ")

print ("\r")

# using delitem() to delete value at 3rd and 4th index

operator.delitem(li,slice(2,4))

# printing modified list after delitem()

print ("The modified list after delitem() is : ",end="")

for i in range(0,len(li)):

    print (li[i],end=" ")

print ("\r")

# using getitem() to access 1st and 2nd element

print ("The 1st and 2nd element of list is : ",end="")

print (operator.getitem(li,slice(0,2)))

Output: 
 

The original list is : 1 5 6 7 8The modified list after setitem() is : 1 2 3 4 8The modified list after delitem() is : 1 2 8The 1st and 2nd element of list is : [1, 2]

 
7. concat(ob1,obj2) :- This function is used to concatenate two containers. 
Operation – obj1 + obj2

8. contains(ob1,obj2) :- This function is used to check if obj2 in present in obj1. 
Operation – obj2 in obj1
 

• Python

# Python code to demonstrate working of 

# concat() and contains()

# importing operator module 

import operator

# Initializing string 1

s1 = "geeksfor"

# Initializing string 2

s2 = "geeks"

# using concat() to concatenate two strings

print ("The concatenated string is : ",end="")

print (operator.concat(s1,s2))

# using contains() to check if s1 contains s2

if (operator.contains(s1,s2)):

       print ("geeksfor contains geeks")

else : print ("geeksfor does not contain geeks")

Output: 
 

The concatenated string is : geeksforgeeksgeeksfor contains geeks

 9. and_(a,b) :- This function is used to compute bitwise and of the mentioned arguments. 
Operation – a & b

10. or_(a,b) :- This function is used to compute bitwise or of the mentioned arguments. 
Operation – a | b

11. xor(a,b) :- This function is used to compute bitwise xor of the mentioned arguments. 
Operation – a ^ b

12. invert(a) :- This function is used to compute bitwise inversion of the mentioned argument. 
Operation – ~ a
 

• Python3

# Python code to demonstrate working of 

# and_(), or_(), xor(), invert()

# importing operator module 

import operator

# Initializing a and b

a = 1

b = 0

# using and_() to display bitwise and operation

print ("The bitwise and of a and b is : ",end="")

print (operator.and_(a,b))

# using or_() to display bitwise or operation

print ("The bitwise or of a and b is : ",end="")

print (operator.or_(a,b))

# using xor() to display bitwise exclusive or operation

print ("The bitwise xor of a and b is : ",end="")

print (operator.xor(a,b))

# using invert() to invert value of a

operator.invert(a)

# printing modified value

print ("The inverted value of a is : ",end="")

print (operator.invert(a))

Output: 
 

The bitwise and of a and b is : 0The bitwise or of a and b is : 1The bitwise xor of a and b is : 1The inverted value of a is : -2