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C extension module doesn't throw exception after setting error indicator through PyErr_SetString()

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I am implementing a C extension module, during this I saw that when I set the global error indicator and error message through PyErr_SetString() API and return false.

But it doesn't throw any error when I tried to check the error through sys.exc_info() then it returns (NULL, NULL, NULL) tuple. 

When I return NULL through the C extension module's function then it works correctly and throws the exception as expected.

The skeleton looks like:

static PyObject* check(PyObject* sef, PyObject* args)
{
        PyObject* input = NULL;
        if (!PyArg_ParseTuple(args, "O", &input)){
             return NULL;
        }
        .....
        .....
        PyErr_SetString(PyExc_Exception, "Throwing Error through check function");
        Py_RETURN_FALSE;
}

Any idea on why this is happening? Any help will be appreciated.

Thanks,
Rahul

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C extension module doesn't throw exception after setting error indicator through PyErr_SetString() rahul <rahul03535@gmail.com> - 2012-08-02 01:57 -0700
  Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() Tim Golden <mail@timgolden.me.uk> - 2012-08-02 10:06 +0100
    Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() rahul <rahul03535@gmail.com> - 2012-08-02 02:21 -0700
    Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() rahul <rahul03535@gmail.com> - 2012-08-02 02:21 -0700
      Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() Tim Golden <mail@timgolden.me.uk> - 2012-08-02 10:37 +0100
        Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() rahul <rahul03535@gmail.com> - 2012-08-02 02:50 -0700
          Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() Tim Golden <mail@timgolden.me.uk> - 2012-08-02 11:45 +0100
          Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() Stefan Behnel <stefan_ml@behnel.de> - 2012-08-02 12:54 +0200
        Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() rahul <rahul03535@gmail.com> - 2012-08-02 02:50 -0700

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