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find out whether a module exists (without importing it)

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  find out whether a module exists (without importing it) Gelonida N <gelonida@gmail.com> - 2012-08-06 22:48 +0200
    Re: find out whether a module exists (without importing it) Miki Tebeka <miki.tebeka@gmail.com> - 2012-08-06 14:58 -0700
    Re: find out whether a module exists (without importing it) Miki Tebeka <miki.tebeka@gmail.com> - 2012-08-06 14:58 -0700
      Re: find out whether a module exists (without importing it) Gelonida N <gelonida@gmail.com> - 2012-08-07 00:40 +0200

#26657 — find out whether a module exists (without importing it)

Is this possible.

let's say I'd like to know whether I could import the module
'mypackage.mymodule', meaning,
whther this module is located somewhere in sys.path

i tried to use

imp.find_module(), but
it didn't find any module name containing a '.'

Am I doing anything wrong?

Is there another existing implementation, that helps.

I could do this manually, but this is something I'd just like to do if 
necessary.

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#26663

> imp.find_module(), but
> it didn't find any module name containing a '.'
The docs (http://docs.python.org/library/imp.html#imp.find_module) clearly say:

"This function does not handle hierarchical module names (names containing dots). In order to find P.M, that is, submodule M of package P, use find_module() and load_module() to find and load package P, and then use find_module() with the path argument set to P.__path__. When P itself has a dotted name, apply this recipe recursively."

See https://gist.github.com/3278829 for possible implementation.

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#26665

> imp.find_module(), but
> it didn't find any module name containing a '.'
The docs (http://docs.python.org/library/imp.html#imp.find_module) clearly say:

"This function does not handle hierarchical module names (names containing dots). In order to find P.M, that is, submodule M of package P, use find_module() and load_module() to find and load package P, and then use find_module() with the path argument set to P.__path__. When P itself has a dotted name, apply this recipe recursively."

See https://gist.github.com/3278829 for possible implementation.

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#26666

On 08/06/2012 11:58 PM, Miki Tebeka wrote:
>> imp.find_module(), but
>> it didn't find any module name containing a '.'
> The docs (http://docs.python.org/library/imp.html#imp.find_module) clearly say:
>
> "This function does not handle hierarchical module names(names
 > containing dots).
Thanks,
Well this explains.

 >  In order to find P.M, that is, submodule M of package P, use 
find_module() and load_module() to find and load package P, and then use 
find_module() with the path argument set to P.__path__. When P itself 
has a dotted name, apply this recipe recursively."
>
> See https://gist.github.com/3278829 for possible implementation.
>


Using imp and then iterating (as you suggested) is probably the fastest 
solution. This is what I will do.

Thanks again.

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