无法提交spark python脚本

Question

我正在使用以下脚本提交python脚本

#!/usr/bin/python

from pyspark.mllib.classification import LogisticRegressionWithSGD
from pyspark.mllib.regression import LabeledPoint
from numpy import array
from pyspark import SparkContext as sc, SparkConf

data = sc.textFile("hdfs:/dataset/parkinsons.data")

得到了这个错误：

data = sc.textFile("hdfs:/dataset/parkinsons.data")
TypeError: unbound method textFile() must be called with SparkContext instance as first argument (got str instance instead)