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> Please revert.
Ok ok, I will revert my change, but only on sys.argv[0].
> A getcwd() call doesn't even have to succeed. A single file python program should still be able to run in that environment rather than fail to start.
The current implementation leaves a path unchanged if it fails to make it absolute:
config_run_filename_abspath:
 wchar_t *abs_filename;
 if (_Py_abspath(config->run_filename, &abs_filename) < 0) {
 /* failed to get the absolute path of the command line filename:
 ignore the error, keep the relative path */
 return _PyStatus_OK();
 }
 if (abs_filename == NULL) {
 return _PyStatus_NO_MEMORY();
 }
 PyMem_RawFree(config->run_filename);
 config->run_filename = abs_filename;
with:
/* Get an absolute path.
 On error (ex: fail to get the current directory), return -1.
 On memory allocation failure, set *abspath_p to NULL and return 0.
 On success, return a newly allocated to *abspath_p to and return 0.
 The string must be freed by PyMem_RawFree(). */
int _Py_abspath(const wchar_t *path, wchar_t **abspath_p);