learn-python-the-hard-way/ex20.py at master · lovvvve/learn-python-the-hard-way · GitHub

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#!/bin/env python
# -*- coding: utf-8 -*-
#:Tital: ex20.py
#:synopsis: ex20.py
#:Date: 2012-12-26
#:Version: 1.0
#:Author: lovvvve
#:Options:


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,kinf of like a tape."

rewind(current_file)

print "Let's print three line:"

current_line=1
print_a_line(current_line,current_file)

current_line=current_line+1
print_a_line(current_line,current_file)

current_line+=1
print_a_line(current_line,current_file)