how to serialize an object collection to RDD? in pySpark?

for example: the simplest operation
class test:

data = 1
def __init__(self):
    self.property=0

def test2(self):
    print("hello")

if name ="_ _ main__":

p1 = test()
p2 = test()
a = [p1,p2]
sc = SparkContext("local[2]", "test" )
rdd = sc.parallelize(a)
rdd.map(lambda x : x.property ).collect()
sc.stop()