import os
import sys

# Configure the environment
if 'SPARK_HOME' not in os.environ:
    os.environ['SPARK_HOME'] = '/srv/spark'

# Create a variable for our root path
SPARK_HOME = os.environ['SPARK_HOME']

# Add the PySpark/py4j to the Python Path
sys.path.insert(0, os.path.join(SPARK_HOME, "python", "build"))
sys.path.insert(0, os.path.join(SPARK_HOME, "python"))


from pyspark import  SparkContext
sc = SparkContext( 'local', 'pyspark')

def isprime(n):
    """
    check if integer n is a prime
    """
    # make sure n is a positive integer
    n = abs(int(n))
    # 0 and 1 are not primes
    if n < 2:
        return False
    # 2 is the only even prime number
    if n == 2:
        return True
    # all other even numbers are not primes
    if not n & 1:
        return False
    # range starts with 3 and only needs to go up the square root of n
    # for all odd numbers
    for x in range(3, int(n**0.5)+1, 2):
        if n % x == 0:
            return False
    return True

# Create an RDD of numbers from 0 to 1,000,000
nums = sc.parallelize(xrange(1000000))

# Compute the number of primes in the RDD
print nums.filter(isprime).count()