Adding cython v0.20.2 in third-party.

third_party/cython/src/pyximport/test/test_pyximport.py

+import pyximport; pyximport.install(reload_support=True)
+import os, sys
+import time, shutil
+import tempfile
+
+def make_tempdir():
+    tempdir = os.path.join(tempfile.gettempdir(), "pyrex_temp")
+    if os.path.exists(tempdir):
+        remove_tempdir(tempdir)
+
+    os.mkdir(tempdir)
+    return tempdir
+
+def remove_tempdir(tempdir):
+    shutil.rmtree(tempdir, 0, on_remove_file_error)
+
+def on_remove_file_error(func, path, excinfo):
+    print "Sorry! Could not remove a temp file:", path
+    print "Extra information."
+    print func, excinfo
+    print "You may want to delete this yourself when you get a chance."
+
+def test():
+    pyximport._test_files = []
+    tempdir = make_tempdir()
+    sys.path.append(tempdir)
+    filename = os.path.join(tempdir, "dummy.pyx")
+    open(filename, "w").write("print 'Hello world from the Pyrex install hook'")
+    import dummy
+    reload(dummy)
+
+    depend_filename = os.path.join(tempdir, "dummy.pyxdep")
+    depend_file = open(depend_filename, "w")
+    depend_file.write("*.txt\nfoo.bar")
+    depend_file.close()
+
+    build_filename = os.path.join(tempdir, "dummy.pyxbld")
+    build_file = open(build_filename, "w")
+    build_file.write("""
+from distutils.extension import Extension
+def make_ext(name, filename):
+    return Extension(name=name, sources=[filename]) 
+""")
+    build_file.close()
+
+    open(os.path.join(tempdir, "foo.bar"), "w").write(" ")
+    open(os.path.join(tempdir, "1.txt"), "w").write(" ")
+    open(os.path.join(tempdir, "abc.txt"), "w").write(" ")
+    reload(dummy)
+    assert len(pyximport._test_files)==1, pyximport._test_files
+    reload(dummy)
+
+    time.sleep(1) # sleep a second to get safer mtimes
+    open(os.path.join(tempdir, "abc.txt"), "w").write(" ")
+    print "Here goes the reolad"
+    reload(dummy)
+    assert len(pyximport._test_files) == 1, pyximport._test_files
+
+    reload(dummy)
+    assert len(pyximport._test_files) ==0, pyximport._test_files
+    remove_tempdir(tempdir)
+
+if __name__=="__main__":
+    test()
+