Rewrote the 'Pure Python mode' tutorial and moved the 'Types' chapter to 'Language basics'.

docs/src/userguide/language_basics.rst

@@ -64,6 +64,30 @@ an anonymous :keyword:`enum` declaration for this purpose, for example,::
 
         ctypedef int* IntPtr
 
+
+Types
+-----
+
+There are numerous types built in to the Cython module. One has all the
+standard C types, namely ``char``, ``short``, ``int``, ``long``, ``longlong``
+as well as their unsigned versions ``uchar``, ``ushort``, ``uint``, ``ulong``,
+``ulonglong``.  One also has ``bint`` and ``Py_ssize_t``.
+
+For each type, there are pointer types ``p_int``, ``pp_int``, . . ., up to
+three levels deep in interpreted mode, and infinitely deep in compiled mode.
+
+The Python types int, long and bool are interpreted as C ``int``, ``long``
+and ``bint`` respectively.
+
+Also, the Python types ``list``, ``dict``, ``tuple``, . . . may
+be used, as well as any user defined types. However at the moment they add very
+few in terms of optimization to a simple ``object`` typing.
+
+Pointer types may be constructed with ``cython.pointer(cython.int)``, and
+arrays as ``cython.int[10]``. A limited attempt is made to emulate these more
+complex types, but only so much can be done from the Python language.
+
+
 Grouping multiple C declarations
 --------------------------------