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copied!<p>You have to include <code>liba.so</code> in your PATH, otherwise Python won't know where to look for it.</p> <p>Try the following code, it'll load the library if it can find it from PATH, otherwise it'll try loading it from the directory of the load script</p> <pre><code>from ctypes import * from ctypes.util import find_library import os if find_library('a'): liba = CDLL(find_library('a')) else: # library is not in your path, try loading it from the current directory print 'liba not found in system path, trying to load it from the current directory' print '%s/%s'%(os.path.dirname(__file__),'liba.so') liba = CDLL(os.path.join(os.path.dirname(__file__),'liba.so')) </code></pre> <p><a href="http://docs.python.org/library/ctypes.html#finding-shared-libraries" rel="nofollow">http://docs.python.org/library/ctypes.html#finding-shared-libraries</a></p> <p><strong>UPDATE:</strong> I was wondering why you created a native library (<code>liba</code>) to access a native 3rd party library (<code>libb</code>). You can import the third party c library straight into python using <code>ctypes</code> and create a python (not native) wrapper for <code>libb</code>. For instance to call the standard c lib <code>time</code> you would do</p> <pre><code>>>> from ctypes import * >>> lib_c = CDLL("libc.so.6") >>> print lib_c.time(None) 1150640792 </code></pre> <p>and for libb</p> <pre><code>>>> from ctypes import * >>> lib_b = CDLL("libb") >>> lib_b.hello_world(None) </code></pre>

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