Problem importing module

[pratz]

Hello,

I have few question regarding importing modules. I have created a folder for my python work
/usr/home/pratz/pyfiles
I have exported this to set the $PATH. And now if I issue the command

echo $PATH

I am getting the string the "/usr/home/pratz/pyfiles" in the list. If I am not wrong then this means that the path is been set correctly. Also, I have set the python path in the environment variable and even that is correct.
Now I have a module called "mod.py" and it has a class "cls1" and this class contains a function func()

mod.py -> cls1 -> func()

Now I create another class cls2 and inherit the class cls1

import mod.py
class cls2 (cls1):

Python says that cls1 is not defined. Need help with this.
Also, how can I call the base class method / function from the derived class, I mean to say

c = cls1()
c.func()
or
mod.func()

I know that the first one is correct, is that the second one will also work?? Any help is appreciated. Thank you.

[vegaseat]

Most likely this should work ...

import mod

class cls2(mod.cls1):
    pass