is it possible to create an object by its name in the run time
Christopher T King
squirrel at WPI.EDU
Tue Aug 17 21:06:12 CEST 2004
On Tue, 17 Aug 2004, Yang Zhang wrote:
> I want to know if it is a build-in func(where can I look up?). If so,
> ignore it otherwise I want to find out which module is it defined in.
All functions and classes have a __module__ attribute which is set to the
name of the module in which they were defined.
> All I know is the name (which is a string), and all the modules that
> this program have imported.
If you first "import __main__", you can use getattr(__main__,"foo") to get
the object named "foo" in the global namespace.
> In the same way, I also need to process the class and methods call. I
> wonder if it is possible? I will appreciate your help very much!!
Here is a small snippet demonstrating the above:
from types import FunctionType, ClassType
def which_module(name, where = __main__):
obj = getattr(where, name)
obj = getattr(__builtins__, name)
if not isinstance(obj, (FunctionType, ClassType)):
raise TypeError, "%s doesn't reference a function or class" % name
print which_module('list') # --> '__builtin__'
from math import sin
print which_module('sin') # --> 'math'
a = 6
print which_module('a') # --> TypeError
Hope this helps.
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