Formating a list of lists, so each list is separated with a line feed

I am attempting to implement an Apyori / Association rule. I am struggling to correctly format the dataset for the model to consume. The documentation outlines that model requires

• Each item is separated with a tab.
• Each transaction is separated with a line feed code. See below or linked documentation

transactions = [
    ['beer', 'nuts'],
    ['beer', 'cheese'],
]

My Tab separated items are coming through fine from the source, but I am struggling to add in a line feed between each transaction/List.

import adodbapi

conn = adodbapi.connect("Provider=MSOLAP.8; \
    Data Source='powerbi://api.powerbi.com/v1.0/myorg/MyPowerBIWorskpace'; \
    Initial Catalog='MyPowerBIReportNameinService'")

curs = conn.cursor()

dmv = """
EVALUATE SELECTCOLUMNS( 'Table Schema List of Lists','Table Schema List of Lists'[Tables_Clean_Names])
"""
curs.execute(dmv)
results = curs.fetchall()
#Below is the relevant code for the question


testlist =[]
for row in results:
    rowlist=[]
    a =row[0]
    rowlist.append(a)
    testlist.append(rowlist)
    #apppend a new line leads to additional list item  followed by coma
    testlist.append('\n')
conn.close()

Using and append ( testlist.append('\n')) leads to an additional comma (see screenshot) .. Any suggestions on how to add a newline with the trailing comma would be appreciated. Despite looking, I have stuggled to fine a solution so far.