533     char *envar = Py_GETENV("PYTHONBREAKPOINT");  in sys_breakpointhook()  local
535     if (envar == NULL || strlen(envar) == 0) {  in sys_breakpointhook()
536         envar = "pdb.set_trace";  in sys_breakpointhook()
538     else if (!strcmp(envar, "0")) {  in sys_breakpointhook()
546     envar = _PyMem_RawStrdup(envar);  in sys_breakpointhook()
547     if (envar == NULL) {  in sys_breakpointhook()
551     const char *last_dot = strrchr(envar, '.');  in sys_breakpointhook()
558         attrname = envar;  in sys_breakpointhook()
560     else if (last_dot != envar) {  in sys_breakpointhook()
562         modulepath = PyUnicode_FromStringAndSize(envar, last_dot - envar);  in sys_breakpointhook()
569         PyMem_RawFree(envar);  in sys_breakpointhook()
580         PyMem_RawFree(envar);  in sys_breakpointhook()
591         PyMem_RawFree(envar);  in sys_breakpointhook()
594     PyMem_RawFree(envar);  in sys_breakpointhook()
604         "Ignoring unimportable $PYTHONBREAKPOINT: \"%s\"", envar);  in sys_breakpointhook()
605     PyMem_RawFree(envar);  in sys_breakpointhook()