Create random list of given length from a list of strings in python

Question

I have a list of strings:

lst = ["orange", "yellow", "green"]

and I want to randomly repeat the values of strings for a given length.

This is my code:

import itertools
lst = ["orange", "yellow", "green"]
list(itertools.chain.from_iterable(itertools.repeat(x, 2) for x in lst))

This implementation repeats but not randomly and also it repeats equally, whereas it should be random as well with the given length.

What result do you eexpect ? The length is the global final ? Please clarify with examples in your post — azro
– azro, Commented Jan 5, 2021 at 10:48
Can you be more clear on what you need, Do you want a list that has a random value given in the input list with the same length — Suhas Kashyap
– Suhas Kashyap, Commented Jan 5, 2021 at 10:55
i want list of length (1,150) where strings("orange", "yellow" and "green") are repeated randomly i.e, ["orange","yellow","orange","yellow","green",...........,"green"] — A R.
– A R., Commented Jan 5, 2021 at 11:03

chqrlie · Accepted Answer · 2022-07-13 17:12:46Z

5

You can use a list comprehension:

import random
lst = ["orange", "yellow", "green"]
[lst[random.randrange(len(lst))] for i in range(100)]

Explanation:

random.randrange(n) returns an integer in the range 0 to n-1 included.
the list comprehension repeatedly adds a random element from lst 100 times.
change 100 to whatever number of elements you wish to obtain.

edited Jul 13, 2022 at 17:12

answered Jan 5, 2021 at 11:07

chqrlie

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costaparas · Accepted Answer · 2021-01-05 11:34:58Z

3

One way is to use random.sample():

Return a k length list of unique elements chosen from the population sequence or set.

Simply set k to be 1 each time you call it. This gives you a list of length 1, randomly selected from the source list.

To generate a large random list, repeatedly call random.sample() in a list comprehension, e.g. 150 times. (Of course, you have to also index the resulting list from random.sample() so that you retrieve just the value rather than a list of length 1).

For example:

import random
lst = ["orange", "yellow", "green"]
print([random.sample(lst, k=1)[0] for i in range(150)])
# Output
# ['green', 'orange', 'green', 'yellow', 'green', ...

edited Jan 5, 2021 at 11:34

answered Jan 5, 2021 at 11:25

costaparas

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