testcode for doc/tutorial/extending_theano_c.txt

doc/tutorial/extending_theano_c.txt

@@ -129,7 +129,7 @@ that the data is not only contiguous in memory but also that it is organized
 such that the index of the latest dimension changes the fastest. If the
 following array
 
-.. code-block:: python
+.. testcode::
 
     x = [[1, 2, 3],
          [4, 5, 6]]
@@ -337,7 +337,7 @@ commonly used.
     of C code that you should include in your C code (after ensuring that a
     Python exception is set) if it needs to raise an exception. Ex:
 
-    .. code-block:: python
+    .. code-block:: c
 
         c_code = """
             PyErr_Format(PyExc_ValueError, "X does not have the right value");
@@ -354,7 +354,7 @@ commonly used.
     ``%`` characters in the format characters need to be escaped since the C
     code itself is defined in a string which undergoes string formatting.
 
-    .. code-block:: python
+    .. code-block:: c
 
         c_code = """
             PyErr_Format(PyExc_ValueError,
@@ -440,7 +440,7 @@ need to validate that the output storage has been allocated and has the same
 shape as our vector input. If it is not the case, we allocate a new output
 storage with the right shape and number of dimensions.
 
-.. code-block:: python
+.. testcode:: examples
 
     import numpy
     import theano
@@ -565,7 +565,7 @@ the inputs (because of the upcast in the method ``make_node()``), the typenum
 of the output has to be obtained in the Python code and then included in the
 C code.
 
-.. code-block:: python
+.. testcode:: examples
 
     class VectorTimesVector(gof.Op):
         __props__ = ()
@@ -705,7 +705,7 @@ implemented using the ``COp`` class.
 
 The new op is defined inside a Python file with the following code :
 
-.. code-block:: python
+.. testcode::
 
     import theano
     from theano import gof
@@ -895,7 +895,7 @@ defined to False. In these descrptions 'i' refers to the position
         corresponds to ``npy_float32`` and can directly be used to declare a
         new variable of the same dtype as the data in the array :
 
-        .. code-block:: c
+        .. testcode::
 
             DTYPE_INPUT_0 myVar = someValue;
 
@@ -914,7 +914,7 @@ In addition to these macros, the ``init_code_struct``, ``code``, and
 *     ``FAIL`` : Code to insert at error points.  A python exception
       should be set prior to this code.  An invocation look like this:
 
-      .. code-block:: c
+      .. testcode::
 
         if (error) {
 	  // Set python exception