Remove redundant lines in setup.py

Fix spelling error in rect.pyx
Remove rect.cpp from the commit. Should not have been added.

docs/examples/tutorial/rectangle_cpp/rect.pyx

-# disutils: language = c++
-# disutils: sources = Rectangle.cpp
+# distutils: language = c++
+# distutils: sources = Rectangle.cpp
 
 # Decalre the class with cdef
 cdef extern from "Rectangle.h" namespace "shapes":

docs/examples/tutorial/rectangle_cpp/setup.py

 from distutils.core import setup, Extension
 from Cython.Build import cythonize
 
-setup(ext_modules = cythonize(Extension(
-           "rect",                                # the extension name
-           sources=["rect.pyx", "Rectangle.cpp"], # the Cython source and
-                                                  # additional C++ source files
-           language="c++",                        # generate and compile C++ code
-      )))
+setup(ext_modules = cythonize("rect.pyx"))

docs/examples/tutorial/rectangle_cpp/test_import.py

@@ -7,6 +7,8 @@ except ImportError:
     print("Module rect has not yet been built")
     print("Please run $python setup.py build_ext --inplace")
     print("Then try again")
+    import sys
+    sys.exit()
 
 x0, y0, x1, y1 = 1, 2, 3, 4