why local variable 'x' referenced before assignment though i am using it after assignment

Question

In the below code, I wrote this code to find the set of prime numbers in a specific range.

I am getting output as:

local variable 'x' referenced before assignment 

(note: I am using Jupiter notebook). I am getting the same error lot of times.

def prime_list(*args):
    limit=args[0]
    primelist=[]
    for y in range (0,limit):
        factor=0
        for x in range(1,y+1):
            if(y%x)==0:
                #print("entered in to modulo loop")
                factor=factor+1
        if(factor<=2):
            #print("{} is prime number".format(y))
            primelist.append(x)
    return primelist
prime_list(10)

Answer 1

You should insert y in the primelist :

def prime_list(*args):
    limit=args[0]
    primelist=[]
    for y in range (0,limit):
        factor=0
        for x in range(1,y+1):
            if(y%x)==0:
                #print("entered in to modulo loop")
                factor=factor+1
        if(factor<=2):
            #print("{} is prime number".format(y))
            primelist.append(y)
    return primelist

prime_list(10)

Output:

[0, 1, 2, 3, 5, 7]