On Thu, Dec 31, 2009 at 8:54 AM, Wells <thewellsoli...@gmail.com> wrote:
> Sorry, this is totally basic, but my Google-fu is failing:
>
> I have a variable foo. I want to instantiate a class based on its
> value- how can I do this?
It sort of depends on where these classes are. If they're in the current
namespace/module, something like:
class A:
pass
class B:
pass
class C:
pass
my_variable = "B"
instance = globals()[my_variable]()
Basically, globals() returns a dictionary of the current module's globals,
which you can access as you please. Personally, I find this ugly and
slightly dangerous(as who knows what else is in your globals that may get
accessed), and would prefer an explicit mapping of available-classes, e.g.:
valid_classes = {"A": A, "B": B, "C": C}
instance = valid_classes[my_variable]()
--S
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