# - - coding: utf- 8 - -
from sys import argv 

script, input_file = 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() #, ##aqui se puede agregar
                                      ##una coma para evitar   
                                      ##imprimir saltos (\n) de mas
current_file = open(input_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 threee lines:"

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)        
        
