Re: problem with PyMapping_SetItemString()
On Apr 22, 12:17 am, Stefan Behnel wrote:
> rahul wrote:
> > tatic PyObject *upadteCheck(PyObject *self,PyObject *args){
> > PyObject *var_pyvalue=NULL,*newVar_pyvalue=NULL,*dict=NULL;
> > char *varName;
>
> > if (!PyArg_ParseTuple(args, "s", &varName)){
> > return NULL;
> > }
> > dict=PyEval_GetLocals();
> > var_pyvalue=PyMapping_GetItemString(dict,varName);
>
> > if(inObject==NULL){
> > dict=PyEval_GetGlobals();
> > var_pyvalue=PyMapping_GetItemString(dict,varName);
> > }
>
> what's "inObject"?
>
> Stefan
Hi Stefan,
That was due to type error, "inObject" is actually "var_pyvalue"
rahul
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Re: problem with PyMapping_SetItemString()
On Apr 21, 2:25 am, rahul wrote: > i have a c extension snip > dict=PyEval_GetLocals(); snip > PyMapping_SetItemString(dict,varname,newVar_pyvalue); snip > than first two test cases runs correctly and gives result for var1 > "value changed" but 3rd test case not gives correct result and value > of var1 remains "abcd" > > why this happen and how i correct it ?? There's no good way to change the variable space programmatically. Python has more flexibility than most other languages as it is. Anyway, your best bet is to use an independent namespace: class Globals: pass setattr( Globals, 'itemX', 'value1' ) setattr( Globals, 'itemX', 'value2' ) Your 'updateCheck' function would then have to take the namespace as an additional parameter. -- http://mail.python.org/mailman/listinfo/python-list
Re: problem with PyMapping_SetItemString()
On Apr 21, 5:25 pm, rahul wrote:
> i have a c extension
>
> tatic PyObject *upadteCheck(PyObject *self,PyObject *args){
> PyObject *var_pyvalue=NULL,*newVar_pyvalue=NULL,*dict=NULL;
> char *varName;
>
> if (!PyArg_ParseTuple(args, "s", &varName)){
> return NULL;
> }
> dict=PyEval_GetLocals();
> var_pyvalue=PyMapping_GetItemString(dict,varName);
>
> if(inObject==NULL){
> dict=PyEval_GetGlobals();
> var_pyvalue=PyMapping_GetItemString(dict,varName);
> }
>
> printf("\n input value for variable %s is : %s
> \n",varName,PyString_AsString(var_pyvalue))
>
> newVar_pyvalue=Py_BuildValue("s","value changed");
>
> PyMapping_SetItemString(dict,varname,newVar_pyvalue);
>
> return Py_BuildValue("");
>
> }
>
> and i have three test cases for this extension
>
> 1.(name test1.py)
> import upadteCheck
> var1= "abcd"
>
> func1():
> updateCheck.updateCheck("var1")
> print var1
>
> 2.(name test2.py)
> import upadteCheck
> var1= "abcd"
> updateCheck.updateCheck("var1")
> print var1
>
> 3.(name test3.py)
> import upadteCheck
>
> func1():
> var1= "abcd"
> updateCheck.updateCheck("var1")
> print var1
>
> if i run these three test cases like
> 1. import test1
> test1.fun1()
>
> 2. python test2
>
> 3. import test3
> test3.func1()
>
> than first two test cases runs correctly and gives result for var1
> "value changed" but 3rd test case not gives correct result and value
> of var1 remains "abcd"
>
> why this happen and how i correct it ??
Because you are trying to update a function's locals -- see this:
http://docs.python.org/library/functions.html?highlight=locals#locals
CPython's function locals are not stored in a dict, for efficiency
reasons. The dict that you get from locals() in Python or
PyEval_GetLocals() in C is constructed temporarily just for the
occasion. Changes to the dict are not reflected in the function's
locals.
Some general comments:
1. Either you have customised Python and C to forgive typos like
update / upadte and undeclared names like inObject, or you have the
annoying and counter-productive habit of re-typing (badly) what you
thought you ran, instead of using copy/paste.
2. Even if what you are attempting "worked", calling the function in
your extension appears to do no more that writing
var1 = "changed value"
instead.
3. Why do you think you need to do what you are attempting? What
problem is it trying to solve? What need or requirement is it intended
to meet?
--
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Re: problem with PyMapping_SetItemString()
rahul wrote:
> tatic PyObject *upadteCheck(PyObject *self,PyObject *args){
> PyObject *var_pyvalue=NULL,*newVar_pyvalue=NULL,*dict=NULL;
> char *varName;
>
> if (!PyArg_ParseTuple(args, "s", &varName)){
> return NULL;
> }
> dict=PyEval_GetLocals();
> var_pyvalue=PyMapping_GetItemString(dict,varName);
>
> if(inObject==NULL){
> dict=PyEval_GetGlobals();
> var_pyvalue=PyMapping_GetItemString(dict,varName);
> }
what's "inObject"?
Stefan
--
http://mail.python.org/mailman/listinfo/python-list
problem with PyMapping_SetItemString()
i have a c extension
tatic PyObject *upadteCheck(PyObject *self,PyObject *args){
PyObject *var_pyvalue=NULL,*newVar_pyvalue=NULL,*dict=NULL;
char *varName;
if (!PyArg_ParseTuple(args, "s", &varName)){
return NULL;
}
dict=PyEval_GetLocals();
var_pyvalue=PyMapping_GetItemString(dict,varName);
if(inObject==NULL){
dict=PyEval_GetGlobals();
var_pyvalue=PyMapping_GetItemString(dict,varName);
}
printf("\n input value for variable %s is : %s
\n",varName,PyString_AsString(var_pyvalue))
newVar_pyvalue=Py_BuildValue("s","value changed");
PyMapping_SetItemString(dict,varname,newVar_pyvalue);
return Py_BuildValue("");
}
and i have three test cases for this extension
1.(name test1.py)
import upadteCheck
var1= "abcd"
func1():
updateCheck.updateCheck("var1")
print var1
2.(name test2.py)
import upadteCheck
var1= "abcd"
updateCheck.updateCheck("var1")
print var1
3.(name test3.py)
import upadteCheck
func1():
var1= "abcd"
updateCheck.updateCheck("var1")
print var1
if i run these three test cases like
1. import test1
test1.fun1()
2. python test2
3. import test3
test3.func1()
than first two test cases runs correctly and gives result for var1
"value changed" but 3rd test case not gives correct result and value
of var1 remains "abcd"
why this happen and how i correct it ??
--
http://mail.python.org/mailman/listinfo/python-list
problem with PyMapping_SetItemString()
i have a c extension
tatic PyObject *upadteCheck(PyObject *self,PyObject *args){
PyObject *var_pyvalue=NULL,*newVar_pyvalue=NULL,*dict=NULL;
char *varName;
if (!PyArg_ParseTuple(args, "s", &varName)){
return NULL;
}
dict=PyEval_GetLocals();
var_pyvalue=PyMapping_GetItemString(dict,varName);
if(inObject==NULL){
dict=PyEval_GetGlobals();
var_pyvalue=PyMapping_GetItemString(dict,varName);
}
printf("\n input value for variable %s is : %s
\n",varName,PyString_AsString(var_pyvalue))
newVar_pyvalue=Py_BuildValue("s","value changed");
PyMapping_SetItemString(dict,varname,newVar_pyvalue);
return Py_BuildValue("");
}
and i have three test cases for this extension
1.(name test1.py)
import upadteCheck
var1= "abcd"
func1():
updateCheck.updateCheck(var1)
print var1
2.(name test2.py)
import upadteCheck
var1= "abcd"
updateCheck.updateCheck(var1)
print var1
3.(name test3.py)
import upadteCheck
func1():
var1= "abcd"
updateCheck.updateCheck(var1)
print var1
if i run these three test cases like
1. import test1
test1.fun1()
2. python test2
3. import test3
test3.func1()
than first two test cases runs correctly and gives result for var1
"value changed" but 3rd test case not gives correct result and value
of var1 remains "abcd"
why this happen and how i correct it ??
--
http://mail.python.org/mailman/listinfo/python-list
