newbie question About O'Reilly "Python for Unix and Linux System Administration" ftp Mirror question

[Joel Goldstick]

On Sun, Sep 16, 2012 at 11:09 AM, moonhkt <moonhkt at gmail.com> wrote:
> Hi All
>
>
> O'Reilly Book ISBN 978-986-6840-36-4.
>
> python --version
> Python 2.6.2 on AIX 5.3
>
> Using this python to get files in ftp server.
>
> I got below error. What is the error meaning and how to fix ?
>
> ftp_mirror.py
> Traceback (most recent call last):
>   File "/xx../shell/ftpmirror.py", line 80, in <module>
>     f = FTPSync(options.host, options.username, options.password,
> options.remote_dir, options.local_dir, opti
> ons.delete)
>   File "xx../shell/ftpmirror.py", line 17, in __init__
>     self.conn.cwd(ftp_base_dir)
>   File "/opt/freeware/lib/python2.6/ftplib.py", line 536, in cwd
>     cmd = 'CWD ' + dirname
> TypeError: cannot concatenate 'str' and 'NoneType' objects
>
> Source :
>
> #!/usr/bin/env python
>
> import ftplib
> import os
>
> class FTPSync(object):
>     def __init__(self, host, username, password, ftp_base_dir,
>                                 local_base_dir, delete=False):
>         self.host = host
>         self.username = username
>         self.password = password
>         self.ftp_base_dir = ftp_base_dir
>         self.local_base_dir = local_base_dir
>         self.delete = delete
>
>         self.conn = ftplib.FTP(host, username, password)
>         self.conn.cwd(ftp_base_dir)
>         try:
>             os.makedirs(local_base_dir)
>         except OSError:
>             pass
>         os.chdir(local_base_dir)
>     def get_dirs_files(self):
>         dir_res = []
>         self.conn.dir('.', dir_res.append)
>         files = [f.split(None, 8)[-1] for f in dir_res if
> f.startswith('-')]
>         dirs = [f.split(None, 8)[-1] for f in dir_res if
> f.startswith('d')]
>         return (files, dirs)
>     def walk(self, next_dir):
>         print "Walking to", next_dir
>         self.conn.cwd(next_dir)
>         try:
>             os.mkdir(next_dir)
>         except OSError:
>             pass
>         os.chdir(next_dir)
>
>         ftp_curr_dir = self.conn.pwd()
>         local_curr_dir = os.getcwd()
>
>         files, dirs = self.get_dirs_files()
>         print "FILES:", files
>         print "DIRS:", dirs
>         for f in files:
>             print next_dir, ':', f
>             outf = open(f, 'wb')
>             try:
>                 self.conn.retrbinary('RETR %s' % f, outf.write)
>             finally:
>                 outf.close()
>             if self.delete:
>                 print "Deleting", f
>                 self.conn.delete(f)
>         for d in dirs:
>             os.chdir(local_curr_dir)
>             self.conn.cwd(ftp_curr_dir)
>             self.walk(d)
>
>     def run(self):
>         self.walk('.')
>
>
> if __name__ == '__main__':
>     from optparse import OptionParser
>     parser = OptionParser()
>     parser.add_option("-o", "--host", dest="host",
>          action='store', help="FTP host")
>     parser.add_option("-u", "--username", dest="username",
>          action='store', help="FTP username")
>     parser.add_option("-p", "--password", dest="password",
>          action='store', help="FTP password")
>     parser.add_option("-r", "--remote_dir", dest="remote_dir",
>          action='store', help="FTP remote starting directory")
>     parser.add_option("-l", "--local_dir", dest="local_dir",
>          action='store', help="Local starting directory")
>     parser.add_option("-d", "--delete", dest="delete", default=False,
>          action='store_true', help="use regex parser")
>
>     (options, args) = parser.parse_args()
comment the next line , then print the parameters and see what they
are.  That should get you started.
>     #f = FTPSync(options.host, options.username, options.password,
>     #        options.remote_dir, options.local_dir, options.delete)
      f = print(options.host, options.username, options.password,
              options.remote_dir, options.local_dir, options.delete)


>     f.run()
>
> --
> http://mail.python.org/mailman/listinfo/python-list



-- 
Joel Goldstick