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PyImport_ImportModule, PyModule_GetDict

Michael P. Reilly arcege at shore.net
Thu Jul 8 13:37:17 EDT 1999 
Randy Heiland <heiland at ncsa.uiuc.edu> wrote:
: If I understand this correctly, the equivalent of doing this:

:>>> import mymodule
:>>> dir(mymodule)

: is sort of this, in the C API:

: PyObject *mod = PyImport_ImportModule("mymodule");
:  PyObject *myDict = PyModule_GetDict(mod);

: Q:  what is the C API equivalent of this:

:>>> from mymodule import *
:>>> dir()


You will have to do something a little more:

    PyObject *fromlist, *main, *globals;
    PyObject *sysmod, *sysdict, *key, *val;
    int pos;  /* used internally by PyDict_Next() */

    /* tell __import__ to return the top-level module */
    fromlist = Py_BuildValue("[s]", "*");
    main = PyImport_ImportModule("__main__");
    globals = PyModule_GetDict(main);

    /* ImportModuleEx handles "from package.module import *" as well */
    sysmod = PyImport_ImportModuleEx("sys", globals, globals, fromlist);

    sysdict = PyModule_GetDict(sysmod);
    /* perform standard name bindings */
    while (PyDict_Next(sysdict, &pos, &key, &val) > 0) {
      if (!PyString_Check(key) ||
          (PyString_AS_STRING(key)[0] != '_'))
        PyDict_SetItem(globals, key, val);
    }

If you look at the documentation for __import__, it does not perform the
name binding in the globals dictionary (for some reason ;), so that must
be performed manually.

  -Arcege
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