"ValueError: Empty module name" on basic import

[alain MONTMORY]

Thank for your response  :-)

I have tried (it's my first try ..)  :

./TestOfficiel TestPythonFoo multiply 3 2

and i get :
[montmory at esoppe1 swigCallPython]$ ./TestOfficiel TestPythonFoo multiply 3 2
ImportError: No module named TestPythonFoo
Failed to load "TestPythonFoo"

Then i tried what you suggest below :
[montmory at esoppe1 swigCallPython]$ python
Python 2.3.4 (#2, Aug 19 2004, 15:49:40)
[GCC 3.4.1 (Mandrakelinux (Alpha 3.4.1-3mdk)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> __import__("TestPythonFoo")
<module 'TestPythonFoo' from 'TestPythonFoo.pyc'>

and it works !!!
why this doesn't work with the api

pModule = PyImport_Import(pName);


pModule is null after the call


is there a PYTHONPATH to set or semething else...

thanks

Alain

John Machin a écrit :
> alain MONTMORY wrote:
>   
>> Hello everybody,
>>
>> I am a newbie to python so I hope I am at the right place to expose my
>> problem..... :-[
>>
>> I am working on linux mandrake 10.1 with python :
>> python -V
>> Python 2.3.4
>> I am trying o run the example which stay in the documentation in paragraph
>> http://www.python.org/doc/2.4.2/ext/pure-embedding.html 5.3 Pure Embedding
>> I download the code example from
>> http://www.python.org/doc/2.4.2/ext/run-func.txt
>> I call the file "TestOfficiel.c" and I compile it with :
>> gcc -g -I/usr/include/python2.3/ TestOfficiel.c -o TestOfficiel
>> -lpython2.3 -ldl
>> all is OK (or seems to be...).
>> as stated in the documentation  I creat a file "TestPythonFoo.py" which
>> contain
>> "
>> def multiply(a,b):
>>     print "Will compute", a, "times", b
>>     c = 0
>>     for i in range(0, a):
>>         c = c + b
>>     return c
>> "
>> I launch
>> ./TestOfficiel ./TestPythonFoo.py multiply 3 2
>> and as a result :
>> ValueError: Empty module name
>> Failed to load "./TestPythonFoo.py"
>>     
>
> This is (I believe) because of the "." at the front.
>
>   
>> if I try an absolute path to the python file :
>> ./TestOfficiel `pwd`/TestPythonFoo.py multiply 3 2
>> I obtain :
>> ImportError: No module named
>> /space/ESOPPE_PROJET/Outils/SwigPython/swigCallPython/TestPythonFoo.py
>>     
>
> It's quite correct, there never could be a module named that. The name
> of your module is TestPythonFoo -- so all you should have to do is
>     ./TestOfficiel TestPythonFoo multiply 3 2
>
>   
>> Failed to load
>> "/space/ESOPPE_PROJET/Outils/SwigPython/swigCallPython/TestPythonFoo.py"
>>     
>
>
>   
>> Of course the file exist :
>> [montmory at esoppe1 swigCallPython]$ ll
>> /space/ESOPPE_PROJET/Outils/SwigPython/swigCallPython/TestPythonFoo.py
>> -rwxrwx--x  1 montmory esoppe 126 sep 29 14:04
>> /space/ESOPPE_PROJET/Outils/SwigPython/swigCallPython/TestPythonFoo.py*
>>
>> I found lot of post about "ValueError: Empty module name" but no clear
>> solution (clear for me...).
>> What's wrong ?
>> my python version?
>> Additionnal informations :
>> gcc version 3.4.1 (Mandrakelinux 10.1 3.4.1-4mdk)
>>
>> Thanks for your help,
>>
>> best regards,
>>
>> Alain
>>
>>
>>
>>
>> --------------070105030901000008070407
>> Content-Type: text/plain
>> Content-Disposition: inline;
>> 	filename="TestOfficiel.c"
>> X-Google-AttachSize: 2022
>>
>> #include <Python.h>
>>
>> int
>> main(int argc, char *argv[])
>> {
>>     PyObject *pName, *pModule, *pDict, *pFunc;
>>     PyObject *pArgs, *pValue;
>>     int i;
>>
>>     if (argc < 3) {
>>         fprintf(stderr,"Usage: call pythonfile funcname [args]\n");
>>     
>
> "pythonfile" is confusing; it should be "modulename".
>
>
>   
Yes you are right, but i left the example file "as it is"
>>         return 1;
>>     }
>>
>>     Py_Initialize();
>>     pName = PyString_FromString(argv[1]);
>>     /* Error checking of pName left out */
>>
>>     pModule = PyImport_Import(pName);
>>     
>
> As the docs for this function say, it just calls the same routine that
> is called by the __import__ built-in function. One can experiment with
> that:
>
>
> OS-prompt>copy con foo.py
> print 'hello fubar world'
> ^Z
>         1 file(s) copied.
>
> OS-prompt>python
> Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)]
> on win32
> Type "help", "copyright", "credits" or "license" for more information.
>   
>>>> __import__("foo")
>>>>         
> hello fubar world
> <module 'foo' from 'foo.py'>
>   
>>>> __import__("foo.py")
>>>>         
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> ImportError: No module named py
>   
>>>> __import__("")
>>>>         
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> ValueError: Empty module name
>   
>>>> __import__(r".\foo")
>>>>         
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> ValueError: Empty module name
>   
>>>> __import__(r"./foo")
>>>>         
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> ValueError: Empty module name
>   
>>>> __import__(r"/foo")
>>>>         
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> ImportError: No module named /foo
>   
>>>> __import__(r".foo")
>>>>         
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> ValueError: Empty module name
>   
>
> Hmmm ... "empty module name" is rather misleading when it starts with a
> "." -- I can feel a bugfix^^^^^^ enhancement request coming on :-)
>
> HTH,
> John
>
>   
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