# Python | Size and element exponentiation of list

• Last Updated : 30 Jan, 2020

Sometimes, while working with Python list, we can have a problem in which we need to extend a list in a very customized way. We may have to repeat contents of list and while doing that, each time new list must be a exponentiation of original list. This incremental expansion has applications in many domains. Let’s discuss a way in which this task can be performed.

Method : Using list comprehension
This task can be performed in a brute manner, but having a shorter implementation using list comprehension always is better. In this, we perform task in 2 steps, first we make a helper list to form a exponentiation factor list and then cumulate the result using original list.

 `# Python3 code to demonstrate working of``# Size and element exponentiation of list``# Using list comprehension`` ` `# initializing list``test_list ``=` `[``4``, ``5``, ``6``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# Extension factor``N ``=` `4`` ` `# Exponentiation factor ``M ``=` `3`` ` `# Size and element exponentiation of list``# Using list comprehension``temp ``=` `[``1` `*` `M``*``*``i ``for` `i ``in` `range``(N)]``res ``=` `list``([ele ``*``*` `tele ``for` `tele ``in` `temp ``for` `ele ``in` `test_list])`` ` `# printing result ``print``(``"List after extension and exponentiation : "` `+` `str``(res))`
Output :
```The original list is : [4, 5, 6]
List after extension and exponentiation : [4, 5, 6, 64, 125, 216, 262144, 1953125, 10077696, 18014398509481984, 7450580596923828125, 1023490369077469249536]
```
My Personal Notes arrow_drop_up