how to include a tiny debug feature in my project ?

[Diez B. Roggisch]

Stef Mientki wrote:

> hello,
> 
> I've large program based, with a GUI based on wxPython,
> where the user can add small parts, which I call Bricks.
> A new Brick is created by inheriting from the standard-Brick.
> The user should only override 1 or 2 functions from the standard-Brick.
> The main properties used in those 2 functions have fixed names.
> Now I've not a good idea, how I should debug that new-Brick.
> 
> Because I don't want to crash the program,
> by bugs in the new-Brick,
> I put the call to the overriden functions in new-Brick in a try-except
> statement. So it won't generate errors,
> and besides that,
> debugging GUI is a crime,
> and I certainly don't want the user to digg into the large program.
> 
> So I'm thinking of another approach:
> - locate the 2 functions of the new-Brick
> - execute them line by line through a exec-statement
> - give a print statement of the most important parameters,
> after the execution of each line
> (The number of lines written by the user will be at most 20 lines)
> 
> Is this a good approach ?
> If so, how can I execute each line separate ?
> If not, what other approach should I use ?

See the module trace.

Diez