How can I remove the white characters from configuration file?

问题

I would like to modify the samba configuration file using python. This is my code

from ConfigParser import SafeConfigParser
parser = SafeConfigParser()
parser.read( '/etc/samba/smb.conf' )

for section in parser.sections():
    print section
    for name, value in parser.items( section ):
        print '  %s = %r' % ( name, value )

but the configuration file contains tab, is there any possibility to ignore the tabs?

ConfigParser.ParsingError: File contains parsing errors: /etc/samba/smb.conf
    [line 38]: '\tworkgroup = WORKGROUP\n'

回答1:

Try this:

from StringIO import StringIO

data = StringIO('\n'.join(line.strip() for line in open('/etc/samba/smb.conf')))

parser = SafeConfigParser()
parser.readfp(data)
...

Another way (thank @mgilson for idea):

class stripfile(file):
    def readline(self):
        return super(FileStripper, self).readline().strip()

parser = SafeConfigParser()
with stripfile('/path/to/file') as f:
    parser.readfp(f)

回答2:

I would create a small proxy class to feed the parser:

class FileStripper(object):
    def __init__(self,f):
        self.fileobj = open(f)
        self.data = ( x.strip() for x in self.fileobj )
    def readline(self):
        return next(self.data)
    def close(self):
        self.fileobj.close()

parser = SafeConfigParser()
f = FileStripper(yourconfigfile)
parser.readfp(f)
f.close()

You might even be able to do a little better (allow for multiple files, automagically close when you're finished with them, etc):

class FileStripper(object):
    def __init__(self,*fnames):
        def _line_yielder(filenames):
            for fname in filenames:
                with open(fname) as f:
                     for line in f:
                         yield line.strip()
        self.data = _line_yielder(fnames)

    def readline(self):
        return next(self.data)

It can be used like this:

parser = SafeConfigParser()
parser.readfp( FileStripper(yourconfigfile1,yourconfigfile2) )
#parser.readfp( FileStripper(yourconfigfile) ) #this would work too
#No need to close anything :).  Horray Context managers!

来源：https://stackoverflow.com/questions/12821946/how-can-i-remove-the-white-characters-from-configuration-file

标签

python

configparser