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())

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 three 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)

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())

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 three 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)
