import csv


with open("my_file.csv", "w") as f: # with is a context manager, as long as you are in this block, f is an open file
  writer = csv.writer(f) # wraps our file (f) in a csv writer. This handles writing to CSV for us.

  for r in range(5): # This is just to generate some fake data
    # writer.writerow takes a list of values to write as one row in the file. The csv writer handles
    # formatting the file for you.
    writer.writerow((r, r+1, r+2, r+3))

# Will create a file called "my_file.csv" with contents
# 0, 1, 2, 3
# 1, 2, 3, 4
# 2, 3, 4, 5
# 3, 4, 5, 6
# 4, 5, 6, 7