python calculate prime numbers until numer

1until = 20
2[n for n in range(2, until) if all(n % m != 0 for m in range(2, n-1))]

1n = 20
2primes = []
3
4for i in range(2, n + 1):
5	for j in range(2, int(i ** 0.5) + 1):
6 		if i%j == 0:
7 			break
8	else:
9		primes.append(i)
10
11print(primes)

1lower = int(input("Enter lower range: "))  
2upper = int(input("Enter upper range: "))  
3  
4for num in range(lower,upper + 1):  
5   if num > 1:  
6       for i in range(2,num):  
7           if (num % i) == 0:  
8               break  
9       else:  
10           print(num)