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CPython provides a Python-level API to the parser, but not to the
tokenizer itself. Somewhat annoyingly, it does provide a nice C API,
but that's not properly exposed for external modules. 
To fix this, the tokenizer.h file should be moved from the Parser
directory to the Include directory, and the (semi-public) functions that
already available must be flagged with PyAPI_FUNC, as shown below.
The PyAPI_FUNC fix should be non-intrusive enough to go into 2.6 and
3.0; moving stuff around is perhaps better left for a later release
(which could also include a Python binding).
Index: tokenizer.h
===================================================================
--- tokenizer.h (revision 514)
+++ tokenizer.h (working copy)
@@ -54,10 +54,10 @@
 const char* str;
 };
-extern struct tok_state *PyTokenizer_FromString(const char *);
-extern struct tok_state *PyTokenizer_FromFile(FILE *, char *, char *);
-extern void PyTokenizer_Free(struct tok_state *);
-extern int PyTokenizer_Get(struct tok_state *, char **, char **);
+PyAPI_FUNC(struct tok_state *) PyTokenizer_FromString(const char *);
+PyAPI_FUNC(struct tok_state *) PyTokenizer_FromFile(FILE *, char *,
char *);
+PyAPI_FUNC(void) PyTokenizer_Free(struct tok_state *);
+PyAPI_FUNC(int) PyTokenizer_Get(struct tok_state *, char **, char **);
 #ifdef __cplusplus
 }