Another Python Exercise

RCJ-AnotherPythonExercise

# import modules
from sys import argv

# unpack argv
script, input_file = argv

# define a function that reads the passed argument
def print_all(f):
    print f.read()

# define a function that seeks the first byte in the passed argument
def rewind(f):
    f.seek(0)

# define a function that prints the passed line_count and reads the line of the passed argument f
def print_a_line(line_count, f):
    print line_count, f.readline()

# assign the opened file passed to argv to the variable current_file
current_file = open(input_file)

# print some text
print "First let's print the whole file:n"

# print the entire file
print_all(current_file)

# print some text
print "Now let's rewind, kind of like a tape."

# start at the first byte of the file
rewind(current_file)

# print some text
print "Let's print three lines:"

# set current_line to 1, print that line_count and then read that line
current_line = 1
print_a_line(current_line, current_file)

# increment the line, and print it
current_line += 1
print_a_line(current_line, current_file)

# increment the line, and print it
current_line += 1
print_a_line(current_line, current_file)