下面的问题涉及了makeTextFile.py和readTextFile.py脚本。
【注】网络上找到的makeTextFile.py和readTextFile.py源代码，和原书例子稍有区别。
'makeTextFile.py -- create text file'
import os
# get filename
while True:
fname = raw_input('Enter file name: ')
if os.path.exists(fname):
print"*** ERROR: '%s' already exists" % fname
else:
break
# get file content (text) lines
all = []
print "\nEnter lines ('.' by itself to quit).\n"
# loop until user terminates input
while True:
entry = raw_input('> ')
if entry == '.':
break
else:
all.append(entry)
# write lines to file with NEWLINE line terminator
fobj = open(fname, 'w')
fobj.write('\n'.join(all))
fobj.close()
print 'DONE!'
'readTextFile.py -- read and display text file'
# get filename
fname = raw_input('Enter file name: ')
print
# attempt to open file for reading
try:
fobj = open(fname, 'r')
except IOError, e:
print"*** file open error:", e
else:
# display contents to the screen
for eachLine in fobj:
print eachLine,
fobj.close()
3-8.
Python代码。将脚本拷贝到你的文件系统中，然后修改它。可以添加注释，修改提示符（‘>’太单调了）等，修改这些代码，使他们看上去更舒服。
【答案】
略。
3-9.
移植。如果你在不同类型的计算机系统中分别安装有Python，检查一下，os.linesep的值是否有不同。记下操作系统的类型及linesep的值。
【答案】
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\root>python
Python 2.7 (r27:82525, Jul 4 2010, 09:01:59) [MSC v.1500 32 bit (Intel)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.linesep
'\r\n'
>>>
在一个linux操作系统中
[GCC 4.1.1] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.linesep
'\n'
