Matt's newb question 1

[MattSS102]

I'm working through a book called Learn Python The Hard Way. I'm on an exercise (15) where the author asks you to comment in explanations of what each line of code does. Could you look at my code and explanations and tell me what the right explanations are and if I got any of them right?

Thanks,

Matt

# I'm not sure what these do exactly. I think import argv imports the argv library.
from sys import argv
# This line makes it so that this script's activation requires the name of it and another input which is the name of the
# file to be opened
script, filename = argv
# creates a variable called txt which functions as to open the file stated in "file name"
txt = open(filename)
# prints a string that contains the name of the file
print "Here's your file %r:" % filename
# prints out the contents of the file represented by "txt"
print txt.read()
# prints a string 
print "Type the filename again:"
# this line creates a variable "file_again" whose contents are supplied by the user. The contents are the txt file name.
file_again = raw_input("> ")
# creates a variable "txt_again" whose contents were supplied by the input the user made in "file_again"
txt_again = open(file_again)
# prints the "file_again" that was opened in the variable txt_again
print txt_again.read()