Dynamic/runtime code introspection/compilation

[Thomas W]

Maybe a stupid subject, but this is what I want to do :

I got some python code stored in a string:

somecode = """

from somemodule import ISomeInterface

class Foo(ISomeInterf ace):
param1 = ...
param2 = ....

"""

and I want to compile that code so that I can use the Foo-class and
check what class it extends, in this case ISomeInterface etc. I've
tried eval, codeop etc. but it doesn't work. Something like this would
be nice :

from somemodule import ISomeInteface

d = compile(sourcec ode)

myfoo = d.Foo()

print ISomeInterface in myfoo.__bases__

Any hints?

[Fredrik Lundh]

Re: Dynamic/runtime code introspection/compilation

Thomas W wrote:

from somemodule import ISomeInteface
>
d = compile(sourcec ode)
>
myfoo = d.Foo()
>
print ISomeInterface in myfoo.__bases__
>
Any hints?

Python is a dynamic language, so compiling something won't tell you much
about what the code actually does. the only reliable way to do that is
to execute the code:

code = compile(sourcec ode)
namespace = {}
exec code in namespace
print issubclass(name space["Foo"])

</F>

[Leo Kislov]

Re: Dynamic/runtime code introspection/compilation


Thomas W wrote:

Maybe a stupid subject, but this is what I want to do :
>
I got some python code stored in a string:
>
somecode = """
>
from somemodule import ISomeInterface
>
class Foo(ISomeInterf ace):
param1 = ...
param2 = ....
>
"""
>
and I want to compile that code so that I can use the Foo-class and
check what class it extends, in this case ISomeInterface etc. I've
tried eval, codeop etc. but it doesn't work. Something like this would
be nice :
>
from somemodule import ISomeInteface
>
d = compile(sourcec ode)
>
myfoo = d.Foo()
>
print ISomeInterface in myfoo.__bases__
>
Any hints?

Here is hello world program for plugins:

import sys

somecode = """
class Foo:
param1 = "Hello, world!"
"""

plugin = type(sys)('unkn own_plugin') # Create new empty module
exec somecode in plugin.__dict__

print plugin.Foo.para m1

-- Leo

[Thomas W]

Re: Dynamic/runtime code introspection/compilation

Great !!! That works like charm.

Thanks alot.

Thomas


Leo Kislov wrote:

Thomas W wrote:

Maybe a stupid subject, but this is what I want to do :

I got some python code stored in a string:

somecode = """

from somemodule import ISomeInterface

class Foo(ISomeInterf ace):
param1 = ...
param2 = ....

"""

and I want to compile that code so that I can use the Foo-class and
check what class it extends, in this case ISomeInterface etc. I've
tried eval, codeop etc. but it doesn't work. Something like this would
be nice :

from somemodule import ISomeInteface

d = compile(sourcec ode)

myfoo = d.Foo()

print ISomeInterface in myfoo.__bases__

Any hints?

>
Here is hello world program for plugins:
>
import sys
>
somecode = """
class Foo:
param1 = "Hello, world!"
"""
>
plugin = type(sys)('unkn own_plugin') # Create new empty module
exec somecode in plugin.__dict__
>
print plugin.Foo.para m1
>
-- Leo