python核心编程学习（三）

核心编程中的文件操作的例子：

'''
Created on 2012-3-7
@author: Administrator
'''
#!/usr/bin/env python
import os
for tmpdir in('C:\\','r'):
    if os.path.isdir(tmpdir):
        print tmpdir
        break
    else:
        print 'no temp'
        tmpdir=''
        
if tmpdir:
    os.chdir(tmpdir)
    cwd = os.getcwd()
    print '**** current temp dir'
    print cwd
    
print '*** creating example dir...'
os.mkdir('example')
os.chdir('example')
cwd = os.getcwd()
print '*** new working dir'
print cwd
print '*** original dir listing:'
print os.listdir(cwd)
print "*** creating  test file..."
fobj = open('test','w')
fobj.write('foo\n')
fobj.write('bar\n')
fobj.close()
print '*** updated dir listing:'
print os.listdir(cwd)
print "*** renaming 'test' to 'filetest.txt'"
os.rename('test', 'filetest.txt')
print '*** updated dir listing:'
print os.listdir(cwd)
path = os.path.join(cwd,os.listdir(cwd)[0])
print '***full file pathname'
print path
print '***(pathname,basename)=='
print os.path.split(path)
print '***(filename,extension)=='
print os.path.splitext(os.path.basename(path))

print '*** displaying file contents:'
fobj=open(path)
for eachLine in fobj:
    print eachLine    
fobj.close()
print '*** deleting test file'
os.remove(path)
print '*** updated dir listing:'
print os.listdir(cwd)
os.chdir(os.pardir)
print '*** deleting test dir'
os.rmdir('example')
print '*** done'

运行结果，比较简单

pydev debugger: starting
C:\
**** current temp dir
C:\
*** creating example dir...
*** new working dir
C:\example
*** original dir listing:
[]
*** creating  test file...
*** updated dir listing:
['test']
*** renaming 'test' to 'filetest.txt'
*** updated dir listing:
['filetest.txt']
***full file pathname
C:\example\filetest.txt
***(pathname,basename)==
('C:\\example', 'filetest.txt')
***(filename,extension)==
('filetest', '.txt')
*** displaying file contents:
foo
bar
*** deleting test file
*** updated dir listing:
[]
*** deleting test dir
*** done