Creating Class Objects in Loop

[Fish]

Hello Folks,
I am reading a CSV file and based on that I am creating TestCase(my
own defined class) objects in a for loop. The problem is each time I
create a new TestCase object in loop, previous objects data is already
copied in that object.

e.g. my sample CSV file is
# -------------------------
hello.pcap, 123, 231
test.pcap, 90, 899
hello2.pcap, 81, 18
# -----------------------

When I print the TestCase elements from returned list I get

(Pdb) print tcLstOrig[0]
Pcap Path: hello.pcap
Sid List: 123, 231, 90, 899, 81, 18,

(Pdb) print tcLstOrig[1]
Pcap Path: test.pcap
Sid List: 123, 231, 90, 899, 81, 18,

(Pdb) print tcLstOrig[2]
Pcap Path: hello2.pcap
Sid List: 123, 231, 90, 899, 81, 18,


Kindly guys advise me on this thing. Function snippet and Class
definition are provided below.

Regards,
Fish

======= Problem Code

The function snippet reading CSV and creating TestCase objects is
[code]
tcLst = []
# CSV file is read in variable 'lines'
def returnTcLst(path):
  fp = open(path)
  lines = fp.readlines()

  for line in lines:
	tc = TestCase()
	i = line.find(",")
	tc.setPcap(line[:i].strip())
	line = line[i+1:]
	line = line + ","
	i = line.find(",")
	while i != -1:
		sid = line[:i].strip()
		tc.appendSid(sid)
		line = line[i+1:]
		i = line.find(",")

	tcLst.append(tc)
	del tc
  return tcLst
[/code]

My TestCase Class is defined as
[code]
class TestCase(object):
	def __init__(self, pcap = None, sids = []):
		self.__Pcap = pcap
		self.__lstSid = sids

	def setPcap(self, path):
		self.__Pcap = path

	def appendSid(self, sid):
		self.__lstSid.append(sid)

	def __str__(self):
		text = "Pcap Path: " + self.__Pcap + "\n"
		text += "Sid List: "
		for sid in self.__lstSid:
			text += sid + ", "
		text += "\n"
		return text
[/code]