import csv
csv_string = """AAA,BBB,CCC
1,テスト,テスト"""
for row in csv.reader(csv_string):
print(row)
print("=====")
for row in csv.reader(csv_string.splitlines()):
print(row)
aW1wb3J0IGNzdgoKY3N2X3N0cmluZyA9ICIiIkFBQSxCQkIsQ0NDCjEs44OG44K544OILOODhuOCueODiCIiIgoKZm9yIHJvdyBpbiBjc3YucmVhZGVyKGNzdl9zdHJpbmcpOgoJcHJpbnQocm93KQoJCnByaW50KCI9PT09PSIpCgpmb3Igcm93IGluIGNzdi5yZWFkZXIoY3N2X3N0cmluZy5zcGxpdGxpbmVzKCkpOgoJcHJpbnQocm93KQo=
['A']
['A']
['A']
['', '']
['B']
['B']
['B']
['', '']
['C']
['C']
['C']
[]
['1']
['', '']
['テ']
['ス']
['ト']
['', '']
['テ']
['ス']
['ト']
=====
['AAA', 'BBB', 'CCC']
['1', 'テスト', 'テスト']