How to split words in a text using PySpark

# Import your libraries

from pyspark.sql.functions import *

# Start writing code

split_words=google_file_store.withColumn('words',split(col('contents'),' ')).select(explode(col("words")).alias("word"))

output=split_words.filter((col('word')=='bear') | (col('word')=='bull'))

output=output.groupBy(col('word')).agg(count('*').alias('netry'))

# To validate your solution, convert your final pySpark df to a pandas df

output.toPandas()