sc.parallelize(["one", "two", "two", "three", "three", "three"]).map(lambda x: (x,1)).repartition(1).saveAsTextFile("feature/all.txt")
load方法：
a=sc.textFile("feature/all.txt")
a.collect()
[u"('one', 1)", u"('two', 1)", u"('two', 1)", u"('three', 1)", u"('three', 1)", u"('three', 1)"]