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Python/ex20.py at master · alnandr/Python · GitHub

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from sys import argv

script, input_file = argv

def print_all(f):

print f.read()

# seek(n) to read a file's content from byte-n

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)

current_file.close()

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