Variable class instantiation

[Jan Mach]

Hi everybody,
I am currently solving the following problem and I am stuck. I am trying
to create instance of the class of variable name. I know, that the
following works:

if (something):
    classToUse = C1
else:
    classToUse = C2

o = classToUse()

,but this is not what I want. I need to have the class name in the string and then
instantiate it:

(this does not work of course)
classToUse = "C1"
o = classToUse()

It is because I don`t know at the moment what the name of the class will be, I will 
load it from the file or pass it as argument. Does anyone know what is the correct syntax
to accomplish this?

Thanks for your time in advance

Jan Mach
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