List index out of range error while accessing 2 lists in python

[K11]

I have 2 Lists in my code.
data list is having len = 11
new_list is having len = 23

I have to search if a string from data list exists in new_list.. I can see that my target_data gets filled with data,but when i go to print it i get an error..

here is my code:

        print len(new_list)
		print len(data)
		
		for i in range(len(new_list)):
			parts = (new_list[i].split('|'))
			#print parts
			if (int(parts[8]) >= 1 or int(parts[9])  >= 1 or int(parts[11])  >= 1 ):
				variable = parts[1]
				variable = variable.strip()
				variable = variable + "']"
				#print variable
				for d in data:
					if variable in d:
						target_data.append(d)	
						print "ok"
					else:
						NODATA = 1
			else:
				NODATA = 1
		print target_data

Error:
23
11
ok
ok
ok
ok
ok
ok
ok
ok
ok
ok
ok
list index out of range

How do i take care of this list out of range error?