Invalid syntax in "for item in L" loop
<p>I have a feeling I'm missing something pretty simple here but, in this one function:</p>

<pre><code>def triplets(perimeter):

    triplets, n, a, b, c = 0  #number of triplets, a, b, c, sides of a triangle, n is used to calculate a triple
    L = primes(int(math.sqrt(perimeter)) #list of primes to divide the perimeter

    for item in L: #iterate through the list of primes
        if perimeter % item == 0: #check if a prime divides the perimeter
            n = perimeter / item
            a = n**2 - (n+1)**2 #http://en.wikipedia.org/wiki/Pythagorean_triple
            b = 2n*(n+1)
            c = n**2 + n**2
            if a+b+c == perimeter: #check if it adds up to the perimeter of the triangle
                triplets = triplets + 1

    return triplets
</code></pre>

<p>I am getting the error:</p>

<pre><code>    for item in L:
                 ^
SyntaxError: invalid syntax
</code></pre>

<p>For completeness my entire program looks like this:</p>

<pre><code>import math

def primes(n): #get a list of primes below a number
    if n==2: return [2]
    elif n&lt;2: return []
    s=range(3,n+1,2)
    mroot = n ** 0.5
    half=(n+1)/2-1
    i=0
    m=3
    while m &lt;= mroot:
        if s[i]:
            j=(m*m-3)/2
            s[j]=0
            while j&lt;half:
                s[j]=0
                j+=m
        i=i+1
        m=2*i+3
    return [2]+[x for x in s if x]

def triplets(perimeter):

    triplets, n, a, b, c = 0  #number of triplets, a, b, c, sides of a triangle, n is used to calculate a triple
    L = primes(int(math.sqrt(perimeter)) #list of primes to divide the perimeter

    for item in L: #iterate through the list of primes
        if perimeter % item == 0: #check if a prime divides the perimeter
            n = perimeter / item
            a = n**2 - (n+1)**2 #http://en.wikipedia.org/wiki/Pythagorean_triple
            b = 2n*(n+1)
            c = n**2 + n**2
            if a+b+c == perimeter: #check if it adds up to the perimeter of the triangle
                triplets = triplets + 1

    return triplets

def solve():
    best = 0
    perimeter = 0
    for i in range(1, 1000):
        if triplets(i) &gt; best:
            best = triplets(i)
            perimeter = i
    return perimeter

print solve()
</code></pre>

<p>I am using Python 2.7.1. I have a semicolon after the for loop, the <code>primes(n)</code> function works, I have a feeling it is probably something stupid but I can't figure out what it is that is causing this invalid syntax.</p>
