How to select multiple columns in a RDD with Spark (pySpark)?
I dont know which version you are using but I recommend DataFrames since most of upgrades are coming for DataFrames. (I prefer spark 2.3.2)

First convert rdd to DataFrame:

df = rdd.toDF(["M","Tu","W","Th","F","Sa","Su"])


Then select days you want to work with:

df.select("M","W","F").show(3)


Or directly use map with lambda:

rdd.map(lambda x: [x[i] for i in [0,2,4])


Hope it helps!