Question

Write a program that Read first n lines of file

Answer 1

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