I'm struggling with self-taught programmer p. 130.

You may miss the point because you don't have a self-taught programmer, but you can save the two scripts in one .py file in this order and run them.Save and run the following specifically:

import csv

with open("st.csv", "w", newline=') asf:
    w=csv.writer(f, delimiter=",")
    w.writerow ("one", "two", "three")
    w.writerow ("four", "five", "six")

with open("st.csv", "r") as f:
    r=csv.reader(f, delimiter=",")
    For row in r:
        print(", ".join(row))

@Delft ViewYou must save it with the extension .py and run the program as shown in your answer.
(For example, save p130writecsv.py and run it like python p130writecsv.py)

This will result in a csv file called st.csv.

Running the second program, the first program appears because you save the first program under the name st.csv and then leave it there.

I have nothing to do with your question, but here are some articles in the same book that stumble for different reasons.
Exit CSV files in Python

Do you study by referring to the same book?Repository for stored programs (probably not the same as the book)
j-kato732/self_study_python
hama28/Python_Test