from py4j.protocol import Py4JError ModuleNotFoundError 错误

from py4j.protocol import Py4JError ModuleNotFoundError: No module named 'py4j'报错了！！！
学习林子雨老师的pySpark慕课时，按照给的链接安装时，运行python3 WordCount.py程序发现了from py4j.protocol import Py4JError ModuleNotFoundError: No module named 'py4j'的错误了。
vim /etc/profile

export JAVA_HOME=/root/app/jdk1.8.0_65
export PATH=$PATH:$JAVA_HOME/bin
export HADOOP_HOME=/root/app/hadoop-3.1.3
export PATH=$PATH:$HADOOP_HOME/binexport HIVE_HOME=/root/app/apache-hive-3.1.2-bin
export PATH=$PATH:$HIVE_HOME/binexport SPARK_HOME=/root/app/spark-3.0.0-bin-hadoop2.7
export PYTHONPATH=$SPARK_HOME/python:$SPARK_HOME/python/lib/py4j-0.10.9-src.zip:$PYTHONPATH
export PATH=$PATH:$SPARK_HOME/bin
export PYSPARK_PYTHON=python3

WorCount.py

from pyspark import SparkConf, SparkContext
conf = SparkConf().setMaster("local").setAppName("My App")
sc = SparkContext(conf = conf)
logFile = "file:///root/app/spark-3.0.0-bin-hadoop2.7/README.md"
logData = sc.textFile(logFile, 2).cache()
numAs = logData.filter(lambda line: 'a' in line).count()
numBs = logData.filter(lambda line: 'b' in line).count()
print('Lines with a: %s, Lines with b: %s' % (numAs, numBs))

参考：https://blog.csdn.net/sinat_38432876/article/details/106270352

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