composites numbers newbie asking for help!! PLEASE!!!

[clouddragon]

Hi,

i am in desperate need for any help regarding one of my assignments. I am to write a python program that lists the numbers that are composite from 1 to n(input) and write it to an external txt. I was able to write something that checks whether something is composite or not but able to incorporate it into a loop as such.

for example: n = 50

then the composite numbers are

4
6
8
10
etc...

n = input ("Please enter a number greater than 1 (0 for exit):")
if n == 0:
    print exit()
def get_factors(n):
    List1 = []
    List2 = []
    List3 = []
    for x in range(2, int(n**0.5)+1):
        if n % x == 0:
            List1 = List1 + [x]
            for y in List1:
                c = n / y
                if c not in List2: 
                    List2 = List2 + [c]
    List3 = List1 + List2
    List3.sort()
    return List3
 
#see if number is a prime
def prime(n):
 
    #range starts with 2 and only needs to go up the squareroot of n
    for x in range(2, int(n**0.5)+1):  
        if n % x == 0:
            return False
    return True
 
 
#print whther its a prime or not
if prime(n):
    print n, "is a not a composite number"
 
else:
    print n, "is a composite number!"
    print get_factors(n)
 
 
#program 2   
n = input("Please enter a number greater than 2: ")
outfile = open('primes-'+str(n)+'.txt','w')
 
 
outfile.write("prime(n)" + '\n')
 
print "Found", len(prime_number(n)), "numbers; please check file primes-",n,".txt"
outfile.close()

Also for the 1st program, how can i make it so it keeps asking for a input until 0 is enter. I was only able to make so it kills the program.

Please help me, any help or input would be greatly appreciated. Thanks in advance.

[clouddragon]

i figured it out most of the program but i am unable to have it write to a outfile.

L = input("Please enter a number greater than 2: ")
outfile = open('primes-'+str(L)+'.txt','w')
for n in range(2, L): #loop
     for x in range(2, int(n**0.5)+1):  
        if n % x == 0:
            print n #prints the number if it is composite, skips the prime.
            break

Here it prints the solution, but i need it to write to the txt. I know i have to use outfile.write( + '\n') but i was unable to get it to work. Please help. Thanks

[Laharl]

outfile.write(str(n)+'\n')

If you don't call str(), a TypeError is thrown because n is an integer.