Am 02.03.10 21:41, schrieb mk:
Jerry Hill wrote:
Just import subprocess at the top of your module. If subprocess
hasn't been imported yet, it will be imported when your module is
loaded. If it's already been imported, your module will use the
cached version that's already been imported.
In other words, it sounds like Python already does what you want. You
don't need to do anything special.
Oh, thanks!
Hmm it's different than dealing with packages I guess -- IIRC, in
packages only code in package's __init__.py was executed?
I don't understand this. But there is no difference regarding caching &
execution between packages and modules.
Importing a package will execute the __init__.py, yes. But only once. As
will importing modules execute them, but only once.
All subsequent imports will just return the created module-object.
Unless you import something under a new name! That is, you can alter the
sys.path and then import a package/module under a different name -
python won't detect that.
Simplest example ist this:
---- test.py ----
class Foo(object):
pass
if __name__ == "__main__":
import test # import ourselves
# this holds, because we have
# __main__.Foo and test.Foo
assert Foo is not test.Foo
---- test.py ----
However, unless you mess with python, this is none of your concern.
Diez
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