Searching for some kind of data type

Giampaolo Rodola' gnewsg at
Sat Aug 2 13:12:03 CEST 2008

for an FTP server I wrote I'd need to group the FTP commands in one
table that defines the command itself, the syntax string, required
permission, whether it requires authorization, whether it takes
argument and whether there's a need to validate the path from the
The more obvious way I found to do that is something like this:

class CommandProperty:
    def __init__(self, perm, auth_needed, arg_needed, check_path,
        self.perm = perm
        self.auth_needed = auth_needed
        self.arg_needed = arg_needed
        self.check_path = check_path
        self.syntax = syntax

ftp_cmds = {
    "ABOR" : CommandProperty(perm=None, auth_needed=True,
arg_needed=False, check_path=False, syntax="ABOR (abort transfer)."),
    "APPE" : CommandProperty(perm='a',  auth_needed=True,
arg_needed=True,  check_path=True,  syntax="APPE <SP> file-name
(append data to an existent file)."),
    "CDUP" : CommandProperty(perm='e',
auth_needed=True,arg_needed=False, check_path=False, syntax="CDUP (go
to parentdirectory)."),

...but I find it somewhat redundant and... "ugly".
I was wondering if there was some kind of data type which could better
fit such purpose or if someone could suggest me some other approach to
do this same thing. Maybe using a dictionary is not the better choice

Thanks in advance

--- Giampaolo

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