Bash variable not working properly in a for loop

Question

I am trying to set a variable that set the number of for loops in bash.

Hi, I am trying to set a variable that set the number of for loops in bash.

#!/bin/bash

num_loops=3
for i in {1.."$num_loops"}
do
 echo $i
done

However I got as output this:

{1..3}

Instead I would like this output:

1
2
3

I am not an expert in bash, but it ooks to me that the variable num_loops has become a string? Can someone explain me this? Thanks