11.11 Lab: Unique random numbers (random module)

Question

Given integer inputs seed, how_many, and max_num, generate a list of how_many unique random integers from 0 to max_num (inclusive).

1. Complete function unique_random_ints(how_many, max_num):
2. Generate a list of how_many random integers from 0 to max_num (inclusive).
3. When a random number exists in the list, a new random number must be generated; use a global variable, retries, to count the number of times an existing number is generated.
4. Return the list.
5. Complete __main__:
6. Initialize the random module with the seed value.
7. Call unique_random_ints() to get a list of random integers.
8. Output the list of random integers and the value of retries, according to the output format shown in the example below.

Refer to the section on the standard library to learn more about the random module and pseudo-random numbers.

Ex: If the input is:

2

5

7

the output is

0 1 5 2 4 retries=1

Answer 1

import random

retries = 0

def unique_random_ints(how_many, max_num):

global retries

lst = []

success = True

while len(lst) < how_many:

newInt = random.randint(0,max_num)

if newInt not in lst:

lst.append(newInt)

else:

retries += 1

success = False

while not success:

newInt = random.randint(0,max_num)

if newInt not in lst:

success = True

lst.append(newInt)

break

retries += 1

return lst

def main():

sseed = int(input("Enter seed: "))

how_many = int(input("Enter how many: "))

max_num = int(input("Enter max num: "))

random.seed(sseed)

lst = unique_random_ints(how_many,max_num)

for n in lst:

print(str(n) + " ", end = '')

print("retries=" + str(retries))

if __name__ == "__main__":

main()