[Tutor] How to skip to next line in for loop

[Brain Stormer]

I have the following code:

f = open('file.txt',r)
for line in f.read():
     if line == "3":
           line.next
           print line
f.close()

The file.txt looks like
1
2
3
4
5

I would like the code to output "4"

but I don't know how to use the next.  Are there any other way?

Thanks

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