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<H1><A NAME="SECTION03670000000000000000"></A><A NAME="s:python:notes"></A>
<BR>
Notes
</H1>
<P>
The Python binding for SIDL long uses <A NAME="10207"></A>Python's unlimited precision
integer data type, so it will not behave exactly like a 64 bit integer
(i.e. there is no overflow). For Python versions before 2.2, your
code needs to guarantee that a Python unlimited precision integer is
used whenever a SIDL long is needed. For example, if you want to call
a method whose SIDL signature is <TT>bool isPrime(long num)</TT>,
calling <TT>isPrime(1)</TT> will fails; but calling <TT>isPrime(1L)</TT>
will work fine.
<P>
The Python binding for an array of SIDL longs may use an array of 64
bit integers if Numeric Python supports a 64 bit integer. Otherwise,
it uses an array of Python's indefinite precision integers (i.e.,
integers with unlimited bits).
<P>
What does this error message mean?
<P>
<BLOCKQUOTE>
<TT> <TT><SPAN CLASS="MATH"><IMG
WIDTH="40" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img26.png"
ALT="$>>>$"></SPAN></TT> <TT><B>import x.y.Zmodule</B></TT>
<BR>
Traceback (innermost last):
<BR>
File "<stdin>", line 1, in ?
<BR>
ImportError: dynamic module does not define init function (initZmodule)
<BR>
</TT></BLOCKQUOTE>
<P>
Is the name of your SIDL interface/class <TT>x.y.Z</TT> or <TT>x.y.Zmodule</TT>,
if it's the former, you should say <TT><B>import x.y.Z</B></TT>.
If this isn't the problem, submit a bug report for Babel.
It might be informative to look at the symbol of the shared library/dynamic
link library using a tool like nm.
I suppose it's also worth checking the PYTHONPATH environment variable
to make sure it's pointing to the right place.
<A NAME="10217"></A>
<P>
<BLOCKQUOTE>
<TT> <TT><SPAN CLASS="MATH"><IMG
WIDTH="40" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img26.png"
ALT="$>>>$"></SPAN></TT> <TT><B>import x.y.Z</B></TT>
<BR>
Fatal Python error: Cannot load implementation for SIDL class x.y.Z
<BR>
Abort (core dumped)
<BR>
</TT></BLOCKQUOTE>
<P>
This means that the Python stub code (the code that links Python to SIDL's
independent object representation (IOR)) failed in its attempt to load the
shared library or dynamic link library containing the implementation of SIDL
class <TT>x.y.Z</TT>.
Make sure the environment variable <TT>SIDL_DLL_PATH</TT> lists all the
directories where the shared libraries/dynamic link libraries for your
SIDL objects/interfaces are stored.
<TT>SIDL_DLL_PATH</TT> is a semicolon separated list of directories
where SIDL client stubs will search for shared libraries required for
SIDL classes and interfaces.
Make sure the directory in which the SIDL runtime resides is in the
<TT>LD_LIBRARY_PATH</TT> (or whatever your machine's mechanism for
locating shared library files is).
<P>
<BLOCKQUOTE>
<TT> <TT><SPAN CLASS="MATH"><IMG
WIDTH="40" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img26.png"
ALT="$>>>$"></SPAN></TT> <TT><B>import x.y.Z</B></TT>
<BR>
Fatal Python error: Cannot load implementation for SIDL interface x.y.Z
<BR>
Abort (core dumped)
<BR>
</TT></BLOCKQUOTE>
<P>
This is the same problem for an interface as described immediately
above for a class.
<P>
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