Python number array program

Question

I have to create a program where the user input asks how many numbers in an array and you have to print those numbers from an array.

Example:

How many values to add to the array:

12

[14, 64, 62, 21, 91, 25, 75, 86, 13, 87, 39, 48]

I don't know how to get all the numbers in one line and how to get different numbers each time. This is what I have so far:

import random


x = int(input("How many values to add to the array: "))

b = random.randint(1,99)
c = random.randint(1,99)

for i in range(x):
    twainQuotes = [random.randint(b,c)]

for i in range(x-1):
    print(twainQuotes)

Does this answer your question? [How do I create a list of random numbers without duplicates?](https://stackoverflow.com/questions/9755538/how-do-i-create-a-list-of-random-numbers-without-duplicates) — David Buck, Mar 10 '20 at 23:16
Well, he never specified, so I'm pretty sure you can have duplicates. — Ayush Garg, Mar 10 '20 at 23:18
The the phrase "how to get different numbers each time" needs to be clarified. — David Buck, Mar 10 '20 at 23:20

score 0 · Answer 1 · answered Mar 10 '20 at 23:14

0

If you are trying to create a list with x random integers 1,99, this should work:

integers = []
for i in range(x):
    integers.append(random.randint(1,99))

answered Mar 10 '20 at 23:14

WangGang

533
3
15

score 0 · Answer 2 · answered Mar 10 '20 at 23:15

You could use this code:

import random
x = int(input("How many values to add to the array: "))

b = random.randint(1,99)
c = random.randint(1,99)

twainQuotes = [] # Initialize list
for i in range(x):
    twainQuotes.append(random.randint(b, c)) # Add random number to list

print(twainQuotes) # Print list

If you want, you can also use list comprehension:

import random
x = int(input("How many values to add to the array: "))

b = random.randint(1,99)
c = random.randint(1,99)

twainQuotes = [random.randint(b, c) for i in range(x)] # Initialize list
print(twainQuotes)

I would suggest not using the b and c values, as you could just do random.randint(1, 99):

import random
x = int(input("How many values to add to the array: "))

twainQuotes = [random.randint(1, 99) for i in range(x)] # Initialize list
print(twainQuotes)

kederrac · Answer 3 · 2020-03-10T23:27:59.437

0

you could use a list comprehension:

if b > c:
    b, c = c, b

twainQuotes = [random.randint(b, c) for _ in range(x)]

to print:

 print(*twainQuotes, sep='\n')

if you want to use for loops:

import random


x = int(input("How many values to add to the array: "))

b = random.randint(1,99)
c = random.randint(1,99)

if b > c:
    b, c = c, b

twainQuotes = []
for i in range(x):
    twainQuotes.append(random.randint(b,c))

for e in twainQuotes:
    print(e)

example output (for input = 2):

52
65

edited Mar 10 '20 at 23:27

answered Mar 10 '20 at 23:15

kederrac

16,819
6
32
55

to explain list comprehension? – kederrac Mar 10 '20 at 23:17
1

@AyushGarg I added a link from the docs about list comprehension, very good info – kederrac Mar 10 '20 at 23:18
I m not using `for` loop, `*` it is to give as non-keyword arguments all the list elements to the print function, you can read more in the [docs](https://docs.python.org/3/library/functions.html#print) – kederrac Mar 10 '20 at 23:20
You don't have to explain how to print! – Ayush Garg Mar 10 '20 at 23:21

score 0 · Answer 4 · answered Mar 10 '20 at 23:25

First of all, maybe it's a copy-paste error, but you have two variable declarations on the same line which was not written correctly.

# either this :
b = random.randint(1,99)
c = random.randint(1,99)

# or this :
b,c = random.randint(1,99), random.randint(1,99)

But, I think your code will return an error if b is bigger than c.

for i in range(x):
    twainQuotes = [random.randint(b,c)]
    # if b > c ValueError will be raised

Instead, I think you can use the list comprehension method? :)

Check the code below :

import random

x = int(input("How many values to add to the array: "))

array = [random.randint(1,99) for each_number in range(x)]

print(array)

Python number array program

4 Answers4