PYTHON_PYSPARK problem

[mrhdy]

Run tweet_listener.py with Python version 3 and desired topic name.
PYSPARK_PYTHON=python3 bin/spark-submit tweet_listener.py "Game of Thrones"

Run twitter_topic_avg_sentiment_val.py with Python version 3.
PYSPARK_PYTHON=python3 bin/spark-submit --packages org.apache.spark:spark-sql-kafka-0-10_2.11:2.1.1 twitter_topic_avg_sentiment_val.py

I am new about spark, when i will write PYSPARK_PYTHON=python3 bin/spark-submit tweet_listener.py "Game of Thrones" to command window it isays;

'PYSPARK_PYTHON' is not recognized as an internal or external command,
operable program or batch file.

what should i do about this problem?