вы можете сначала разбить данные на строку, а затем снова на ','.
ver = '''2018.12.0400:00,0.73572,0.73614,0.73544,0.73550,520,0
2018.12.0401:00,0.73550,0.73594,0.73545,0.73553,1181,0
2018.12.0402:00,0.73553,0.73606,0.73510,0.73539,1960,0
2018.12.0403:00,0.73539,0.73621,0.73481,0.73608,2898,0'''
ver = [i.split(',') for i in ver.split('\n')]
df = pd.DataFrame(ver)
df
output:
0 1 2 3 4 5 6
0 2018.12.0400:00 0.73572 0.73614 0.73544 0.73550 520 0
1 2018.12.0401:00 0.73550 0.73594 0.73545 0.73553 1181 0
2 2018.12.0402:00 0.73553 0.73606 0.73510 0.73539 1960 0
3 2018.12.0403:00 0.73539 0.73621 0.73481 0.73608 2898 0