Query regarding set([])?

[vox]

Hi,
I'm contsructing a simple compare-script and thought I would use set
([]) to generate the difference output. But I'm obviosly doing
something wrong.

file1 contains 410 rows.
file2 contains 386 rows.
I want to know what rows are in file1 but not in file2.

This is my script:
s1 = set(open("file1"))
s2 = set(open("file2"))
s3 = set([])
s1temp = set([])
s2temp = set([])

s1temp = set(i.strip() for i in s1)
s2temp = set(i.strip() for i in s2)
s3 = s1temp-s2temp

print len(s3)

Output is 119. AFAIK 410-386=24. What am I doing wrong here?

BR,
Andy