in_test.py

# linkedin Python Community
# Python the Hard Way, Lesson 20
# Sample code
from sys import argv


def print_all(f):
	print(f.read())


def rewind(f):
	f.seek(0)


def print_a_line(line_count, f):
	print(line_count, f.readline())


def main():
	input_file = argv[1]
	with open(input_file, 'r', encoding='utf-8') as current_file:

		print("First let's print the whole file:\n")
		print_all(current_file)

		print("Now let's rewind, kind of like a tape.")
		rewind(current_file)

		print("Let's print three lines:")
		current_line = 1
		for x in range(3):
			print_a_line(current_line + x, current_file)


if __name__ == '__main__':
	main()

Response to try and help out a fellow Pythonista.