[FIXED] How to get random item from a list in python3 without any module

Issue

I am using Python 3.9 & have a list list1 = ['a', 'b', 'c', 'd'] I want to get a random item from the list without using any module like there is a module random in Python and a function random.choice(list1) I can use this but is there another way to get a random item from a list in Python without using any module?

Solution

Random and pseudorandom number generators will ultimately rely on some kind of module, if only to get a seed needed to produce pseudorandom numbers. One common example of a seed is time.time found in the time module, though it's not necessarily a good one. The only way without a module is to choose a fixed seed, but then only a fixed sequence of numbers is possible.

Besides the seed, there is the algorithm. One popular choice is the linear congruential generator (LCG). This algorithm is appropriate for learning purposes; however, LCGs are far from perfect and should not be used in security applications or serious simulations. See this answer: How to sync a PRNG between C#/Unity and Python?

There are two more things involved in the solution: generating a uniform random integer, and choosing a uniform random item from a list.

• Generating a uniform random integer in [0, n); that is, building RNDINTEXC(n). For that, see Melissa O'Neill's page.
• Choosing a uniform random item from a list, doing list[RNDINTEXC(len(list))].

Answered By - Peter O.