author | andy simpson <andrews@symbian.org> |
Fri, 08 Oct 2010 16:52:59 +0100 | |
changeset 119 | 931f2bbaabf7 |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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.. highlightlang:: c |
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******************************** |
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Porting Extension Modules to 3.0 |
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******************************** |
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:author: Benjamin Peterson |
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.. topic:: Abstract |
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Although changing the C-API was not one of Python 3.0's objectives, the many |
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Python level changes made leaving 2.x's API intact impossible. In fact, some |
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changes such as :func:`int` and :func:`long` unification are more obvious on |
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the C level. This document endeavors to document incompatibilities and how |
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they can be worked around. |
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Conditional compilation |
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======================= |
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The easiest way to compile only some code for 3.0 is to check if |
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:cmacro:`PY_MAJOR_VERSION` is greater than or equal to 3. :: |
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#if PY_MAJOR_VERSION >= 3 |
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#define IS_PY3K |
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#endif |
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API functions that are not present can be aliased to their equivalents within |
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conditional blocks. |
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Changes to Object APIs |
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====================== |
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Python 3.0 merged together some types with similar functions while cleanly |
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separating others. |
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str/unicode Unification |
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----------------------- |
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Python 3.0's :func:`str` (``PyString_*`` functions in C) type is equivalent to |
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2.x's :func:`unicode` (``PyUnicode_*``). The old 8-bit string type has become |
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:func:`bytes`. Python 2.6 and later provide a compatibility header, |
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:file:`bytesobject.h`, mapping ``PyBytes`` names to ``PyString`` ones. For best |
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compatibility with 3.0, :ctype:`PyUnicode` should be used for textual data and |
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:ctype:`PyBytes` for binary data. It's also important to remember that |
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:ctype:`PyBytes` and :ctype:`PyUnicode` in 3.0 are not interchangeable like |
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:ctype:`PyString` and :ctype:`PyString` are in 2.x. The following example shows |
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best practices with regards to :ctype:`PyUnicode`, :ctype:`PyString`, and |
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:ctype:`PyBytes`. :: |
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#include "stdlib.h" |
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#include "Python.h" |
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#include "bytesobject.h" |
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/* text example */ |
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static PyObject * |
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say_hello(PyObject *self, PyObject *args) { |
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PyObject *name, *result; |
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if (!PyArg_ParseTuple(args, "U:say_hello", &name)) |
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return NULL; |
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result = PyUnicode_FromFormat("Hello, %S!", name); |
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return result; |
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} |
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/* just a forward */ |
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static char * do_encode(PyObject *); |
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/* bytes example */ |
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static PyObject * |
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encode_object(PyObject *self, PyObject *args) { |
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char *encoded; |
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PyObject *result, *myobj; |
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if (!PyArg_ParseTuple(args, "O:encode_object", &myobj)) |
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return NULL; |
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encoded = do_encode(myobj); |
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if (encoded == NULL) |
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return NULL; |
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result = PyBytes_FromString(encoded); |
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free(encoded); |
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return result; |
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} |
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long/int Unification |
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-------------------- |
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In Python 3.0, there is only one integer type. It is called :func:`int` on the |
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Python level, but actually corresponds to 2.x's :func:`long` type. In the |
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C-API, ``PyInt_*`` functions are replaced by their ``PyLong_*`` neighbors. The |
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best course of action here is using the ``PyInt_*`` functions aliased to |
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``PyLong_*`` found in :file:`intobject.h`. The the abstract ``PyNumber_*`` APIs |
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can also be used in some cases. :: |
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#include "Python.h" |
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#include "intobject.h" |
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static PyObject * |
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add_ints(PyObject *self, PyObject *args) { |
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int one, two; |
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PyObject *result; |
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if (!PyArg_ParseTuple(args, "ii:add_ints", &one, &two)) |
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return NULL; |
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112 |
|
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return PyInt_FromLong(one + two); |
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} |
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115 |
|
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116 |
|
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117 |
|
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118 |
Module initialization and state |
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119 |
=============================== |
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120 |
|
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Python 3.0 has a revamped extension module initialization system. (See PEP |
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:pep:`3121`.) Instead of storing module state in globals, they should be stored |
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in an interpreter specific structure. Creating modules that act correctly in |
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both 2.x and 3.0 is tricky. The following simple example demonstrates how. :: |
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125 |
|
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#include "Python.h" |
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|
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struct module_state { |
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PyObject *error; |
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}; |
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131 |
|
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#if PY_MAJOR_VERSION >= 3 |
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#define GETSTATE(m) ((struct module_state*)PyModule_GetState(m)) |
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#else |
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#define GETSTATE(m) (&_state) |
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static struct module_state _state; |
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#endif |
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138 |
|
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static PyObject * |
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error_out(PyObject *m) { |
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struct module_state *st = GETSTATE(m); |
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PyErr_SetString(st->error, "something bad happened"); |
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return NULL; |
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144 |
} |
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145 |
|
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146 |
static PyMethodDef myextension_methods[] = { |
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{"error_out", (PyCFunction)error_out, METH_NOARGS, NULL}, |
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148 |
{NULL, NULL} |
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149 |
}; |
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150 |
|
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151 |
#if PY_MAJOR_VERSION >= 3 |
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152 |
|
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153 |
static int myextension_traverse(PyObject *m, visitproc visit, void *arg) { |
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154 |
Py_VISIT(GETSTATE(m)->error); |
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155 |
return 0; |
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156 |
} |
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|
157 |
|
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158 |
static int myextension_clear(PyObject *m) { |
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|
159 |
Py_CLEAR(GETSTATE(m)->error); |
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|
160 |
return 0; |
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|
161 |
} |
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|
162 |
|
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|
163 |
|
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|
164 |
static struct PyModuleDef moduledef = { |
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|
165 |
PyModuleDef_HEAD_INIT, |
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|
166 |
"myextension", |
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|
167 |
NULL, |
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|
168 |
sizeof(struct module_state), |
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|
169 |
myextension_methods, |
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|
170 |
NULL, |
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|
171 |
myextension_traverse, |
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|
172 |
myextension_clear, |
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|
173 |
NULL |
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|
174 |
}; |
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|
175 |
|
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|
176 |
#define INITERROR return NULL |
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|
177 |
|
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|
178 |
PyObject * |
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|
179 |
PyInit_myextension(void) |
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180 |
|
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|
181 |
#else |
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|
182 |
#define INITERROR return |
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|
183 |
|
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|
184 |
void |
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|
185 |
initmyextension(void) |
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|
186 |
#endif |
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|
187 |
{ |
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|
188 |
#if PY_MAJOR_VERSION >= 3 |
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|
189 |
PyObject *module = PyModule_Create(&moduledef); |
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|
190 |
#else |
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|
191 |
PyObject *module = Py_InitModule("myextension", myextension_methods); |
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|
192 |
#endif |
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|
193 |
|
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|
194 |
if (module == NULL) |
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|
195 |
INITERROR; |
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|
196 |
struct module_state *st = GETSTATE(module); |
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|
197 |
|
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|
198 |
st->error = PyErr_NewException("myextension.Error", NULL, NULL); |
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|
199 |
if (st->error == NULL) { |
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|
200 |
Py_DECREF(module); |
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|
201 |
INITERROR; |
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|
202 |
} |
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|
203 |
|
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|
204 |
#if PY_MAJOR_VERSION >= 3 |
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|
205 |
return module; |
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|
206 |
#endif |
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|
207 |
} |
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|
208 |
|
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|
209 |
|
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|
210 |
Other options |
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|
211 |
============= |
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|
212 |
|
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|
213 |
If you are writing a new extension module, you might consider `Cython |
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|
214 |
<http://www.cython.org>`_. It translates a Python-like language to C. The |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
215 |
extension modules it creates are compatible with Python 3.x and 2.x. |
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|
216 |