Put the code example from "pure python mode" in a file in the examples directory for testing.

docs/examples/tutorial/pure/A_equivalent.pyx

+cpdef int myfunction(int x, int y=2):
+    a = x - y
+    return a + x * y
+
+cdef double _helper(double a):
+    return a + 1
+
+cdef class A:
+    cdef public int a, b
+    def __init__(self, b=0):
+        self.a = 3
+        self.b = b
+
+    cpdef foo(self, double x):
+        print(x + _helper(1.0))

docs/src/tutorial/pure.rst

@@ -68,23 +68,9 @@ and adds :file:`A.pxd`::
         cdef public int a,b
         cpdef foo(self, double x)
 
-then Cython will compile the :file:`A.py` as if it had been written as follows::
+then Cython will compile the :file:`A.py` as if it had been written as follows:
 
-    cpdef int myfunction(int x, int y=2):
-        a = x-y
-        return a + x * y
-
-    cdef double _helper(double a):
-        return a + 1
-
-    cdef class A:
-        cdef public int a,b
-        def __init__(self, b=0):
-            self.a = 3
-            self.b = b
-
-        cpdef foo(self, double x):
-            print(x + _helper(1.0))
+.. literalinclude:: ../../examples/tutorial/pure/A_equivalent.pyx
 
 Notice how in order to provide the Python wrappers to the definitions
 in the :file:`.pxd`, that is, to be accessible from Python,