Write a program that Read first n lines of file

Python 2:

with open ("datafile") as myfile:

head = [next (myfile) for x in xrange (N) ]

print head

Python 3:

with open ("datafile") as myfile:

head = [next (myfile) for x in range (N) ]

print (head)

Both Python 2 & 3:

from itertools import islice

with open ("datafile") as myfile:

head = list (islice (myfile, N))

print head