string to type object (C)

[castironpi]

Hello,

I'm looking for a one-to-one function from strings to the built-in
data types in C. I will be keeping the string in a file. I need the
PyTypeObject* back from it. If nothing else I'll just do a bunch of
strcmp( "tuple" ) { return &PyTuple_Typ e; } commands, provided
&PyTuple_Typ e; will be linking the right address.

The project is for a hobby, no money or official credentials on the
line. Any help is appreciated.

[Terry Reedy]

Re: string to type object (C)



castironpi wrote:

Hello,
>
I'm looking for a one-to-one function from strings to the built-in
data types in C. I will be keeping the string in a file. I need the
PyTypeObject* back from it.

Use a dict mapping py strings to the object pointers (cast to py ints).

[Miles]

Re: string to type object (C)

On Tue, Aug 5, 2008 at 2:30 AM, castironpi <castironpi@gma il.comwrote:

I'm looking for a one-to-one function from strings to the built-in
data types in C. I will be keeping the string in a file. I need the
PyTypeObject* back from it. If nothing else I'll just do a bunch of
strcmp( "tuple" ) { return &PyTuple_Typ e; } commands, provided
&PyTuple_Typ e; will be linking the right address.

Something along the lines of this?
b = PyImport_Import ("__builtin__") ;
return PyObject_GetAtt rString(b, typestring);

-Miles

[castironpi]

Re: string to type object (C)

On Aug 5, 7:59 pm, Miles <semantic...@gm ail.comwrote:

On Tue, Aug 5, 2008 at 2:30 AM, castironpi <castiro...@gma il.comwrote:

I'm looking for a one-to-one function from strings to the built-in
data types in C.  I will be keeping the string in a file.  I need the
PyTypeObject* back from it.  If nothing else I'll just do a bunch of
strcmp( "tuple" ) { return &PyTuple_Typ e; } commands, provided
&PyTuple_Typ e; will be linking the right address.

>
Something along the lines of this?
b = PyImport_Import ("__builtin__") ;
return PyObject_GetAtt rString(b, typestring);
>
-Miles

Miles,

That's what I was looking for. I wanted to avoid the heavy Import but
I thought I remembered that imports are free after the first time.

Import needed a PyString.

PyObject* s= PyString_FromSt ring( "__builtin_ _" );
PyObject* b= PyImport_Import (s);
return PyObject_GetAtt rString(b, "str");

I expect I need a Py_DECREF on s and b.

Do you know if uncooperative (not necc'ly malicious) code could
interfere:

>>__builtin__.i nt= None
>>__builtin__.i nt
>>__builtin__.i nt= type( 0 )
>>__builtin__.i nt

<type 'int'>

? Or would PyImport_Import (s) create a namespace that had the int
type in it from scratch?

[Gabriel Genellina]

Re: string to type object (C)

En Wed, 06 Aug 2008 01:55:10 -0300, castironpi <castironpi@gma il.com>
escribi�:

Do you know if uncooperative (not necc'ly malicious) code could
interfere:
>

>>>__builtin__. int= None
>>>__builtin__. int
>>>__builtin__. int= type( 0 )
>>>__builtin__. int

<type 'int'>
>
? Or would PyImport_Import (s) create a namespace that had the int
type in it from scratch?

Once you modify __builtin__, any later access to builtin names will see
the changed values.
I don't know of any way to "reset" the builtin module - other than calling
again _PyBuiltin_Init from C code.

--
Gabriel Genellina