import re
#f=r'sample.txt'
#text = open(f, 'r').read()
text = r"""Submitted By,Assigned,Closed
Name1,10,5
Name2,20,10
Name3,30,15"""
rePat = re.compile('^[^,\n]+,([^,\n]+),.*$', re.MULTILINE)
output = re.findall(rePat, text)
print (output)
aW1wb3J0IHJlCgojZj1yJ3NhbXBsZS50eHQnCiN0ZXh0ID0gb3BlbihmLCAncicpLnJlYWQoKQp0ZXh0ID0gciIiIlN1Ym1pdHRlZCBCeSxBc3NpZ25lZCxDbG9zZWQKTmFtZTEsMTAsNQpOYW1lMiwyMCwxMApOYW1lMywzMCwxNSIiIgoKcmVQYXQgPSByZS5jb21waWxlKCdeW14sXG5dKywoW14sXG5dKyksLiokJywgcmUuTVVMVElMSU5FKQpvdXRwdXQgPSByZS5maW5kYWxsKHJlUGF0LCB0ZXh0KQpwcmludCAob3V0cHV0KQ==