Generate random number in range excluding some numbers

Solution 1:

Try this:

from random import choice

print choice([i for i in range(0,9) if i not in [2,5,7]])

Solution 2:

Try with something like this:

from random import randint

def random_exclude(*exclude):
  exclude = set(exclude)
  randInt = randint(0,9)
  return my_custom_random() if randInt in exclude else randInt 
  
print(random_exclude(2, 5, 7))

Solution 3:

If you have larger lists, i would recommend to use set operations because they are noticeable faster than the recomended answer.

random.choice(list(set([x for x in range(0, 9)]) - set(to_exclude)))

I took took a few tests with both the accepted answer and my code above.

For each test i did 50 iterations and measured the average time. For testing i used a range of 999999.

to_exclude size 10 elements:
Accepted answer = 0.1782s
This answer = 0.0953s

to_exclude size 100 elements:
Accepted answer = 01.2353s
This answer = 00.1117s

to_exclude size 1000 elements:
Accepted answer = 10.4576s
This answer = 00.1009s