Inheritance confusion

[Hook]

Hi,

I'm having a problem with multiple inheritance - it's clearly something 
I've missed, but the web pages and books that I've consulted aren't 
helping, so I'll throw myself on the mercy and collective wisdom of 
Usenet!

I've got 4 files (what I'll show has the active content removed for 
brevity):

Errors_m.py
~~~~~~~~~~~
class Errors (object) :
    def __init__ (self, params) :
        pass

    def Error (self, string) :
        return 100

DT_m.py
~~~~~~~
class DT (object) :
    def __init__ (self, params) :
		pass

    def Date (self, epoch, pattern = 'd mmm yyyy') :
        dt = datetime.datetime.fromtimestamp (epoch)

Hook_m.py
~~~~~~~~~
from DT_m import DT
from Error_m import Errors

class Hook (Errors, DT) :
    def __init__ (self, params) :
        DT.__init__ (self, params)
        Errors.__init__ (self, params)

DB_m.py
~~~~~~~
from Hook_m import Hook

class DB (Hook) :
    def __init__ (self, params) :
        Hook.__init__ (self, params)


And a test script:

#!/usr/bin/python

import os
import re
import string
import sys

from DB_m import DB

Dict = dict ()
Dict ['logdir'] = '/tmp/log'
Dict ['diag']   = 1

Obj = DB (Dict)
print dir (Obj)
Obj.Connect ('Database')


When I run the script I get this:

Traceback (most recent call last):
  File "./3.py", line 20, in <module>
    Obj.Connect ('Database')
  File "/mnt/isis/Projects/Python/Learning/DB_m.py", line 102, in Connect
    self.TRACE ("DB::Connect (" + database + "," + mode)
  File "/mnt/isis/Projects/Python/Learning/Hook_m.py", line 314, in TRACE
    self.DailyLog (msg)
  File "/mnt/isis/Projects/Python/Learning/Hook_m.py", line 98, in 
DailyLog
    dt          = self.Date (time ())
TypeError: 'module' object is not callable


Googling the "TypeError" message suggests that I've got a module and 
class with the same name, but I can't see that I have.

Can someone point me in the right direction please?

If you need to see all the source, can do, but it's certainly too much 
for an intro message!

Thanks,

Hook