New submission from Chris Morton <[email protected]>:
Compiling (Window 10, MSVS 16):
#include <Python.h>
int main(int argc, char* argv[])
{
const char* code = "c=[1,2,3,4]\nd={'list': [c[i] for i in
range(len(c))]}\nprint(d)\n";
Py_Initialize();
PyObject* pycode = Py_CompileString(code, "", Py_file_input );
PyObject* main_module = PyImport_AddModule("__main__");
PyObject* global_dict = PyModule_GetDict(main_module);
PyObject* local_dict = PyDict_New();
PyEval_EvalCode(pycode, global_dict, local_dict); // (PyCodeObject*)
pycode in Python 2.7
Py_Finalize();
return 0;
and executing yields:
Traceback (most recent call last):
File "", line 2, in <module>
File "", line 2, in <listcomp>
NameError: name 'c' is not defined
While not particularly clever python code, it is not clear why the reference c
is not in scope having previously been defined. Replacing the clumsy list
comprehension using range() with c[:] or [ci for ci in c] produces the expected
result:
{'list': [1, 2, 3, 4]}
This issue is not observed with Python 2.7 (.18).
----------
components: C API
messages: 388557
nosy: chrisgmorton
priority: normal
severity: normal
status: open
title: PyEval_EvalCode() namespace issue not observed in Python 2.7.
versions: Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue43481>
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