第15个python程序：读文件

[root@mysql1 pshell]# cat ex15.py 

#!/usr/bin/env Python

#-*-coding:utf-8-*-

from sys import argv

script,filename = argv

txt = open(filename)

print "here's your file %r:" % filename

print txt.read()

print "type the filename again:"

file_again = raw_input("> ")

txt_again = open(file_again)

print txt_again.read()

[root@mysql1 pshell]# cat ex15_sample.txt 

this is stuff i typed into a file.

it is really cool stuff.

lots and lots of fun to have in here.

[root@mysql1 pshell]# 

[root@mysql1 pshell]# python ex15.py ex15_sample.txt

here's your file 'ex15_sample.txt':

this is stuff i typed into a file.

it is really cool stuff.

lots and lots of fun to have in here.

type the filename again:

> ex15_sample.txt

this is stuff i typed into a file.

it is really cool stuff.

lots and lots of fun to have in here.

[root@mysql1 pshell]# python ex15.py /root/pshell/ex15_sample.txt  

here's your file '/root/pshell/ex15_sample.txt':

this is stuff i typed into a file.

it is really cool stuff.

lots and lots of fun to have in here.

type the filename again:

> /root/pshell/ex15_sample.txt 

Traceback (most recent call last):

  File "ex15.py", line 14, in <module>

    txt_again = open(file_again)

IOError: [Errno 2] No such file or directory: '/root/pshell/ex15_sample.txt '  ---------输入绝对文件名的时候后面多了个空格

[root@mysql1 pshell]# python ex15.py /root/pshell/ex15_sample.txt

here's your file '/root/pshell/ex15_sample.txt':

this is stuff i typed into a file.

it is really cool stuff.

lots and lots of fun to have in here.

type the filename again:

> /root/pshell/ex15_sample.txt

this is stuff i typed into a file.

it is really cool stuff.

lots and lots of fun to have in here.