Some Newbie Questions

[Leopold Schwinger]

Matteo Dell'Amico wrote:

> Leopold Schwinger wrote:
> 
>> (1) Is there any operator in Python in order to call a Member-Function 
>> from a class without creating an instance of the class? (In C++ and 
>> PHP there ist this operator "::" <class>::<memberfunction>)
> 
> 
> Just call it. :-)
> 
> When you are using methods from instances, the first argument (the one 
> that is usually called "self") is automagically bound to the instance. 
> When you access it from the class, this won't happen (and the method, in 
> this case, is called "unbound").
> 
> For instance:
>  >>> class A(object):
> ...     def foo(self):
> ...             print self
> ...
>  >>> a = A()
>  >>> a.foo()
> <__main__.A object at 0x401f7d6c>
>  >>> A.foo(a)
> <__main__.A object at 0x401f7d6c>
>  >>> A.foo
> <unbound method A.foo>
>  >>> a.foo
> <bound method A.foo of <__main__.A object at 0x401f7d6c>>
> 
> You have an interactive prompt, try playing with it! :-)
> 
>> (2) Is there any way to dynamically import modules, where the name of 
>> the module is not known during implementation but can be defined durch
>> scipt execution? Think of lots of different config-Files, which differ 
>> by Path & Name but the variables are all named equal, and i want to 
>> import a special config-File during the execution of the script.
> 
> 
> You can use the __import__ built-in. For your problem, look at
> http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/283531 .
> 
>> (3) Is there any way to obtain a kind of "trace"-Info (the actual 
>> filename and codeline) in order to provide some debug-Info in the case 
>> of errors (In C++ and PHP there are these "__line__" and "__file__" 
>> functions, For Python I have only found <Class>.__dict__ and 
>> dir(<Class>))
> 
> 
> traceback module. Keep the Library Reference under your pillow! :-)
> 

Thank you for your anwsers, i will play around a bit...