problem of double import in python

[Mohsen Pahlevanzadeh]

When i uncomment 
////
from common.interface.interface import ShowHide
////
in file contains Ui_Materials class i get the following traceback:
//////////////////////////
Traceback (most recent call last):
  File "./main.py", line 110, in <module>
    main()
  File "./main.py", line 91, in main
    interfaceObj.showMaterials()
  File
"/home/mohsen/codes/amlak/amlak/src/common/interface/interface.py", line
80, in showMaterials
    self.ui = Ui_Materials()
NameError: global name 'Ui_Materials' is not defined
//////////////////////////////////
Yours,
Mohsen
On Tue, 2013-09-03 at 05:18 +0430, Mohsen Pahlevanzadeh wrote:
> Dear all,
> 
> I remember to avoiding to confusing compiler for header, use 
> /////////////////
> // in my include file
> #define MYHEADER_H
> // and in others code use:
> #ifndef MYHEADER_H
> #include blahblah
> /////////////////////////
> 
> Unfortunately, i prevent to same error, double import to python, but i
> don't know how to solve, Even i don't know policy of python programmers.
> 
> You'll make me happy if explain me...
> 
> Yours,
> Mohsen
>