Test for Pypy with Travis.

.travis.yml

@@ -18,7 +18,11 @@ matrix:
       dist: trusty
       sudo: required
       python: 3.5
-# Travis does not support yet Python installation (see https://github.com/travis-ci/travis-ci/issues/2312).
+    - os: linux
+      dist: trusty
+      sudo: required
+      python: pypy
+# Travis does not support yet Python installation on OSX (see https://github.com/travis-ci/travis-ci/issues/2312).
 # We will therefore only test with the preinstalled Python 2.7
     - os: osx
       osx_image: xcode8

pyroaring/types_declarations.py

@@ -11,7 +11,7 @@
 try:
     libroaring = ctypes.cdll.LoadLibrary(libfilename)
 except OSError as e:
-    if (is_python2 and sys.argv[0] != '-c') or (not is_python2 and sys.argv[0] != '-m'):
+    if 'install' not in sys.argv and 'uninstall' not in sys.argv: # dirty, but there is no universal way to detect if pyroaring is ran as a script or is imported...
         sys.stderr.write('ERROR: cannot open shared library %s\n' % libfilename)
         sys.stderr.write('       Please make sure that the library can be found.\n')
         sys.stderr.write('       For instance, on GNU/Linux, it could be in /usr/lib and /usr/include directories,\n')