Operations on Python Lists

Operations on Python Lists

It is possible to perform operations like addition, multiplication and searching on Python Lists. 

Addition Operation on Python Lists

Addition operation on Lists is possible using + operator:

>>> list1 = [1, 2] 
>>> list1
[1, 2]

>>> list2 = [3, 4] 
>>> list2
[3, 4]

>>> list1 + list2
[1, 2, 3, 4]

Multiplication Operation on Python Lists

Multiplication operation on Lists is possible using * operator:

>>> mylist = [1, 2] 
>>> mylist
[1, 2]

>>> mylist * 3 
[1, 2, 1, 2, 1, 2]

Note: The + and * operations do not modify the list. The original list will remain same even after use of + and * symbols on it. 

Search operation in Python Lists

in keyword can be used to search an element in the given list.

>>> insurance = ['sbi', 'icici', 'hdfc', 'hsbc'] 
>>> insurance
['sbi', 'icici', 'hdfc', 'hsbc']

>>> 'sbi' in insurance 
True

>>> 'seas' in insurance 
False

Assignment operation to Slices

Use of assignment operator to slices is possible. It can even change the size of the list or clear it entirely:

>>> letters = ['a', 'b', 'c', 'd', 'e', 'f', 'g']

>>> letters

['a', 'b', 'c', 'd', 'e', 'f', 'g']

# replace some values of lists

>>> letters[2:5] = ['C', 'D', 'E']

>>> letters

['a', 'b', 'C', 'D', 'E', 'f', 'g']

# remove elements from list

>>> letters[2:5] = []

>>> letters

['a', 'b', 'f', 'g']

# clear the list by replacing all the elements with an empty list

>>> letters[:] = []

>>> letters

[]