from sys import argv

script, input_file = argv


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


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


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


current_file = open(input_file)

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

print("Now, let's rewind")
print('=================\n')
rewind(current_file)

print("Let's print three lines")
print('=======================\n')
current_line = 1
print_a_line(current_line, current_file)
current_line = current_line + 1
print_a_line(current_line, current_file)
current_line = current_line + 1
print_a_line(current_line, current_file)

from sys import argv

script, input_file = argv


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


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


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


current_file = open(input_file)

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

print("Now, let's rewind")
print('=================\n')
rewind(current_file)

print("Let's print three lines")
print('=======================\n')
current_line = 1
print_a_line(current_line, current_file)
current_line = current_line + 1
print_a_line(current_line, current_file)
current_line = current_line + 1
print_a_line(current_line, current_file)
