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Operator Functions in Python | Set 2
• Difficulty Level : Easy
• Last Updated : 23 Feb, 2021

Operator Functions in Python | Set 1

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 8
The modified list after setitem() is : 1 5 6 3 8
The modified list after delitem() is : 1 6 3 8
The 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 8
The modified list after setitem() is : 1 2 3 4 8
The modified list after delitem() is : 1 2 8
The 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 : geeksforgeeks
geeksfor 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 : 0
The bitwise or of a and b is : 1
The bitwise xor of a and b is : 1
The inverted value of a is : -2```

This article is contributed by Manjeet Singh. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
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