 Open in App
Not now

# Python – Random range in list

• Last Updated : 10 Mar, 2023

Given a List, extract random range from it.

Input : test_list = [3, 19, 4, 8, 10, 13, 5, 7, 2, 1, 4]
Output : [5, 7, 2, 1]
Explanation : A random range elements are extracted of any length.

Input : test_list = [3, 19, 4, 8, 10, 13, 5, 7, 2, 1, 4]
Output : [4, 8]
Explanation : A random range elements are extracted of any length.

Method : Using randrange() + slicing

randrange(): Python offers a function that can generate random numbers from a specified range and also allowing rooms for steps to be included, called randrange() in random module.

In this, we extract index of list, and for first index, and then again employ the function to get end part of range using randrange() from start index to list length. The range is extracted using slicing.

## Python3

 `# Python3 code to demonstrate working of``# Random range in list``# Using randrange() + slicing``import` `random`  `# function to Random range in list``def` `rabdomRangeList(test_list):``    ``# getting ranges``    ``strt_idx ``=` `random.randrange(``0``, ``len``(test_list) ``-` `1``)``    ``end_idx ``=` `random.randrange(strt_idx, ``len``(test_list) ``-` `1``)` `    ``# getting range elements``    ``res ``=` `test_list[strt_idx: end_idx]` `    ``return` `str``(res)`  `# Driver Code``# initializing list``input_list1 ``=` `[``3``, ``19``, ``4``, ``8``, ``10``, ``13``, ``5``, ``7``, ``2``, ``1``, ``4``]` `# printing original list``print``(``"\nThe original list is : "``, input_list1)` `# printing result``print``(``"Required List : "` `+` `rabdomRangeList(input_list1))`  `# initializing list``input_list2 ``=` `[``3``, ``19``, ``4``, ``8``, ``10``, ``13``, ``5``, ``7``, ``2``, ``1``, ``4``]` `# printing original list``print``(``"\nThe original list is : "``, input_list2)` `# printing result``print``(``"Required List : "` `+` `rabdomRangeList(input_list2))`  `# initializing list``input_list3 ``=` `[``3``, ``19``, ``4``, ``8``, ``10``, ``13``, ``5``, ``7``, ``2``, ``1``, ``4``]` `# printing original list``print``(``"\nThe original list is : "``, input_list3)` `# printing result``print``(``"Required List : "` `+` `rabdomRangeList(input_list3))`

Output:

```The original list is :  [3, 19, 4, 8, 10, 13, 5, 7, 2, 1, 4]
Required List : 

The original list is :  [3, 19, 4, 8, 10, 13, 5, 7, 2, 1, 4]
Required List : [10, 13, 5, 7]

The original list is :  [3, 19, 4, 8, 10, 13, 5, 7, 2, 1, 4]
Required List : []```

Time Complexity: O(n) where n is the number of elements in the list
Auxiliary Space: O(n) additional space of size n is created where n is the number of elements in the list

My Personal Notes arrow_drop_up