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cpython/PC/getpathp.c

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/* Return the initial module search path. */
/* Used by DOS, Windows 3.1, Windows 95/98, Windows NT. */
/* ----------------------------------------------------------------
PATH RULES FOR WINDOWS:
This describes how sys.path is formed on Windows. It describes the
functionality, not the implementation (ie, the order in which these
are actually fetched is different)
* Python always adds an empty entry at the start, which corresponds
to the current directory.
* If the PYTHONPATH env. var. exists, its entries are added next.
* We look in the registry for "application paths" - that is, sub-keys
under the main PythonPath registry key. These are added next (the
order of sub-key processing is undefined).
HKEY_CURRENT_USER is searched and added first.
HKEY_LOCAL_MACHINE is searched and added next.
(Note that all known installers only use HKLM, so HKCU is typically
empty)
* We attempt to locate the "Python Home" - if the PYTHONHOME env var
is set, we believe it. Otherwise, we use the path of our host .EXE's
to try and locate our "landmark" (lib\\os.py) and deduce our home.
- If we DO have a Python Home: The relevant sub-directories (Lib,
plat-win, etc) are based on the Python Home
- If we DO NOT have a Python Home, the core Python Path is
loaded from the registry. This is the main PythonPath key,
and both HKLM and HKCU are combined to form the path)
* Iff - we can not locate the Python Home, have not had a PYTHONPATH
specified, and can't locate any Registry entries (ie, we have _nothing_
we can assume is a good path), a default path with relative entries is
used (eg. .\Lib;.\plat-win, etc)
The end result of all this is:
* When running python.exe, or any other .exe in the main Python directory
(either an installed version, or directly from the PCbuild directory),
the core path is deduced, and the core paths in the registry are
ignored. Other "application paths" in the registry are always read.
* When Python is hosted in another exe (different directory, embedded via
COM, etc), the Python Home will not be deduced, so the core path from
the registry is used. Other "application paths" in the registry are
always read.
* If Python can't find its home and there is no registry (eg, frozen
exe, some very strange installation setup) you get a path with
some default, but relative, paths.
* An embedding application can use Py_SetPath() to override all of
these authomatic path computations.
---------------------------------------------------------------- */
#include "Python.h"
#include "osdefs.h"
#include <wchar.h>
#ifdef MS_WINDOWS
#include <windows.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif /* HAVE_SYS_TYPES_H */
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif /* HAVE_SYS_STAT_H */
#include <string.h>
/* Search in some common locations for the associated Python libraries.
*
* Py_GetPath() tries to return a sensible Python module search path.
*
* The approach is an adaptation for Windows of the strategy used in
* ../Modules/getpath.c; it uses the Windows Registry as one of its
* information sources.
*
* Py_SetPath() can be used to override this mechanism. Call Py_SetPath
* with a semicolon separated path prior to calling Py_Initialize.
*/
#ifndef LANDMARK
#define LANDMARK L"lib\\os.py"
#endif
static wchar_t prefix[MAXPATHLEN+1];
static wchar_t progpath[MAXPATHLEN+1];
static wchar_t dllpath[MAXPATHLEN+1];
static wchar_t *module_search_path = NULL;
static int
is_sep(wchar_t ch) /* determine if "ch" is a separator character */
{
#ifdef ALTSEP
return ch == SEP || ch == ALTSEP;
#else
return ch == SEP;
#endif
}
/* assumes 'dir' null terminated in bounds. Never writes
beyond existing terminator.
*/
static void
reduce(wchar_t *dir)
{
size_t i = wcslen(dir);
while (i > 0 && !is_sep(dir[i]))
--i;
dir[i] = '\0';
}
static int
exists(wchar_t *filename)
{
return GetFileAttributesW(filename) != 0xFFFFFFFF;
}
/* Assumes 'filename' MAXPATHLEN+1 bytes long -
may extend 'filename' by one character.
*/
static int
ismodule(wchar_t *filename) /* Is module -- check for .pyc/.pyo too */
{
if (exists(filename))
return 1;
/* Check for the compiled version of prefix. */
if (wcslen(filename) < MAXPATHLEN) {
wcscat(filename, Py_OptimizeFlag ? L"o" : L"c");
if (exists(filename))
return 1;
}
return 0;
}
/* Add a path component, by appending stuff to buffer.
buffer must have at least MAXPATHLEN + 1 bytes allocated, and contain a
NUL-terminated string with no more than MAXPATHLEN characters (not counting
the trailing NUL). It's a fatal error if it contains a string longer than
that (callers must be careful!). If these requirements are met, it's
guaranteed that buffer will still be a NUL-terminated string with no more
than MAXPATHLEN characters at exit. If stuff is too long, only as much of
stuff as fits will be appended.
*/
static void
join(wchar_t *buffer, wchar_t *stuff)
{
size_t n, k;
if (is_sep(stuff[0]))
n = 0;
else {
n = wcslen(buffer);
if (n > 0 && !is_sep(buffer[n-1]) && n < MAXPATHLEN)
buffer[n++] = SEP;
}
if (n > MAXPATHLEN)
Py_FatalError("buffer overflow in getpathp.c's joinpath()");
k = wcslen(stuff);
if (n + k > MAXPATHLEN)
k = MAXPATHLEN - n;
wcsncpy(buffer+n, stuff, k);
buffer[n+k] = '\0';
}
/* gotlandmark only called by search_for_prefix, which ensures
'prefix' is null terminated in bounds. join() ensures
'landmark' can not overflow prefix if too long.
*/
static int
gotlandmark(wchar_t *landmark)
{
int ok;
Py_ssize_t n;
n = wcslen(prefix);
join(prefix, landmark);
ok = ismodule(prefix);
prefix[n] = '\0';
return ok;
}
/* assumes argv0_path is MAXPATHLEN+1 bytes long, already \0 term'd.
assumption provided by only caller, calculate_path() */
static int
search_for_prefix(wchar_t *argv0_path, wchar_t *landmark)
{
/* Search from argv0_path, until landmark is found */
wcscpy(prefix, argv0_path);
do {
if (gotlandmark(landmark))
return 1;
reduce(prefix);
} while (prefix[0]);
return 0;
}
#ifdef MS_WINDOWS
#ifdef Py_ENABLE_SHARED
/* a string loaded from the DLL at startup.*/
extern const char *PyWin_DLLVersionString;
/* Load a PYTHONPATH value from the registry.
Load from either HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER.
Works in both Unicode and 8bit environments. Only uses the
Ex family of functions so it also works with Windows CE.
Returns NULL, or a pointer that should be freed.
XXX - this code is pretty strange, as it used to also
work on Win16, where the buffer sizes werent available
in advance. It could be simplied now Win16/Win32s is dead!
*/
static wchar_t *
getpythonregpath(HKEY keyBase, int skipcore)
{
HKEY newKey = 0;
DWORD dataSize = 0;
DWORD numKeys = 0;
LONG rc;
wchar_t *retval = NULL;
WCHAR *dataBuf = NULL;
static const WCHAR keyPrefix[] = L"Software\\Python\\PythonCore\\";
static const WCHAR keySuffix[] = L"\\PythonPath";
size_t versionLen;
DWORD index;
WCHAR *keyBuf = NULL;
WCHAR *keyBufPtr;
WCHAR **ppPaths = NULL;
/* Tried to use sysget("winver") but here is too early :-( */
versionLen = strlen(PyWin_DLLVersionString);
/* Space for all the chars, plus one \0 */
keyBuf = keyBufPtr = malloc(sizeof(keyPrefix) +
sizeof(WCHAR)*(versionLen-1) +
sizeof(keySuffix));
if (keyBuf==NULL) goto done;
memcpy(keyBufPtr, keyPrefix, sizeof(keyPrefix)-sizeof(WCHAR));
keyBufPtr += Py_ARRAY_LENGTH(keyPrefix) - 1;
mbstowcs(keyBufPtr, PyWin_DLLVersionString, versionLen);
keyBufPtr += versionLen;
/* NULL comes with this one! */
memcpy(keyBufPtr, keySuffix, sizeof(keySuffix));
/* Open the root Python key */
rc=RegOpenKeyExW(keyBase,
keyBuf, /* subkey */
0, /* reserved */
KEY_READ,
&newKey);
if (rc!=ERROR_SUCCESS) goto done;
/* Find out how big our core buffer is, and how many subkeys we have */
rc = RegQueryInfoKey(newKey, NULL, NULL, NULL, &numKeys, NULL, NULL,
NULL, NULL, &dataSize, NULL, NULL);
if (rc!=ERROR_SUCCESS) goto done;
if (skipcore) dataSize = 0; /* Only count core ones if we want them! */
/* Allocate a temp array of char buffers, so we only need to loop
reading the registry once
*/
ppPaths = malloc( sizeof(WCHAR *) * numKeys );
if (ppPaths==NULL) goto done;
memset(ppPaths, 0, sizeof(WCHAR *) * numKeys);
/* Loop over all subkeys, allocating a temp sub-buffer. */
for(index=0;index<numKeys;index++) {
WCHAR keyBuf[MAX_PATH+1];
HKEY subKey = 0;
DWORD reqdSize = MAX_PATH+1;
/* Get the sub-key name */
DWORD rc = RegEnumKeyExW(newKey, index, keyBuf, &reqdSize,
NULL, NULL, NULL, NULL );
if (rc!=ERROR_SUCCESS) goto done;
/* Open the sub-key */
rc=RegOpenKeyExW(newKey,
keyBuf, /* subkey */
0, /* reserved */
KEY_READ,
&subKey);
if (rc!=ERROR_SUCCESS) goto done;
/* Find the value of the buffer size, malloc, then read it */
RegQueryValueExW(subKey, NULL, 0, NULL, NULL, &reqdSize);
if (reqdSize) {
ppPaths[index] = malloc(reqdSize);
if (ppPaths[index]) {
RegQueryValueExW(subKey, NULL, 0, NULL,
(LPBYTE)ppPaths[index],
&reqdSize);
dataSize += reqdSize + 1; /* 1 for the ";" */
}
}
RegCloseKey(subKey);
}
/* return null if no path to return */
if (dataSize == 0) goto done;
/* original datasize from RegQueryInfo doesn't include the \0 */
dataBuf = malloc((dataSize+1) * sizeof(WCHAR));
if (dataBuf) {
WCHAR *szCur = dataBuf;
DWORD reqdSize = dataSize;
/* Copy our collected strings */
for (index=0;index<numKeys;index++) {
if (index > 0) {
*(szCur++) = L';';
dataSize--;
}
if (ppPaths[index]) {
Py_ssize_t len = wcslen(ppPaths[index]);
wcsncpy(szCur, ppPaths[index], len);
szCur += len;
assert(dataSize > (DWORD)len);
dataSize -= (DWORD)len;
}
}
if (skipcore)
*szCur = '\0';
else {
/* If we have no values, we dont need a ';' */
if (numKeys) {
*(szCur++) = L';';
dataSize--;
}
/* Now append the core path entries -
this will include the NULL
*/
rc = RegQueryValueExW(newKey, NULL, 0, NULL,
(LPBYTE)szCur, &dataSize);
}
/* And set the result - caller must free */
retval = dataBuf;
}
done:
/* Loop freeing my temp buffers */
if (ppPaths) {
for(index=0;index<numKeys;index++)
if (ppPaths[index]) free(ppPaths[index]);
free(ppPaths);
}
if (newKey)
RegCloseKey(newKey);
if (keyBuf)
free(keyBuf);
return retval;
}
#endif /* Py_ENABLE_SHARED */
#endif /* MS_WINDOWS */
static void
get_progpath(void)
{
extern wchar_t *Py_GetProgramName(void);
wchar_t *path = _wgetenv(L"PATH");
wchar_t *prog = Py_GetProgramName();
#ifdef MS_WINDOWS
#ifdef Py_ENABLE_SHARED
extern HANDLE PyWin_DLLhModule;
/* static init of progpath ensures final char remains \0 */
if (PyWin_DLLhModule)
if (!GetModuleFileNameW(PyWin_DLLhModule, dllpath, MAXPATHLEN))
dllpath[0] = 0;
#else
dllpath[0] = 0;
#endif
if (GetModuleFileNameW(NULL, progpath, MAXPATHLEN))
return;
#endif
if (prog == NULL || *prog == '\0')
prog = L"python";
/* If there is no slash in the argv0 path, then we have to
* assume python is on the user's $PATH, since there's no
* other way to find a directory to start the search from. If
* $PATH isn't exported, you lose.
*/
#ifdef ALTSEP
if (wcschr(prog, SEP) || wcschr(prog, ALTSEP))
#else
if (wcschr(prog, SEP))
#endif
wcsncpy(progpath, prog, MAXPATHLEN);
else if (path) {
while (1) {
wchar_t *delim = wcschr(path, DELIM);
if (delim) {
size_t len = delim - path;
/* ensure we can't overwrite buffer */
len = min(MAXPATHLEN,len);
wcsncpy(progpath, path, len);
*(progpath + len) = '\0';
}
else
wcsncpy(progpath, path, MAXPATHLEN);
/* join() is safe for MAXPATHLEN+1 size buffer */
join(progpath, prog);
if (exists(progpath))
break;
if (!delim) {
progpath[0] = '\0';
break;
}
path = delim + 1;
}
}
else
progpath[0] = '\0';
}
static int
find_env_config_value(FILE * env_file, const wchar_t * key, wchar_t * value)
{
int result = 0; /* meaning not found */
char buffer[MAXPATHLEN*2+1]; /* allow extra for key, '=', etc. */
fseek(env_file, 0, SEEK_SET);
while (!feof(env_file)) {
char * p = fgets(buffer, MAXPATHLEN*2, env_file);
wchar_t tmpbuffer[MAXPATHLEN*2+1];
PyObject * decoded;
size_t n;
if (p == NULL)
break;
n = strlen(p);
if (p[n - 1] != '\n') {
/* line has overflowed - bail */
break;
}
if (p[0] == '#') /* Comment - skip */
continue;
decoded = PyUnicode_DecodeUTF8(buffer, n, "surrogateescape");
if (decoded != NULL) {
Py_ssize_t k;
k = PyUnicode_AsWideChar(decoded,
tmpbuffer, MAXPATHLEN * 2);
Py_DECREF(decoded);
if (k >= 0) {
wchar_t * tok = wcstok(tmpbuffer, L" \t\r\n");
if ((tok != NULL) && !wcscmp(tok, key)) {
tok = wcstok(NULL, L" \t");
if ((tok != NULL) && !wcscmp(tok, L"=")) {
tok = wcstok(NULL, L"\r\n");
if (tok != NULL) {
wcsncpy(value, tok, MAXPATHLEN);
result = 1;
break;
}
}
}
}
}
}
return result;
}
static void
calculate_path(void)
{
wchar_t argv0_path[MAXPATHLEN+1];
wchar_t *buf;
size_t bufsz;
wchar_t *pythonhome = Py_GetPythonHome();
wchar_t *envpath = NULL;
#ifdef MS_WINDOWS
int skiphome, skipdefault;
wchar_t *machinepath = NULL;
wchar_t *userpath = NULL;
wchar_t zip_path[MAXPATHLEN+1];
size_t len;
if (!Py_IgnoreEnvironmentFlag) {
envpath = _wgetenv(L"PYTHONPATH");
}
#else
char *_envpath = Py_GETENV("PYTHONPATH");
wchar_t wenvpath[MAXPATHLEN+1];
if (_envpath) {
size_t r = mbstowcs(wenvpath, _envpath, MAXPATHLEN+1);
envpath = wenvpath;
if (r == (size_t)-1 || r >= MAXPATHLEN)
envpath = NULL;
}
#endif
get_progpath();
/* progpath guaranteed \0 terminated in MAXPATH+1 bytes. */
wcscpy(argv0_path, progpath);
reduce(argv0_path);
/* Search for an environment configuration file, first in the
executable's directory and then in the parent directory.
If found, open it for use when searching for prefixes.
*/
{
wchar_t tmpbuffer[MAXPATHLEN+1];
wchar_t *env_cfg = L"pyvenv.cfg";
FILE * env_file = NULL;
wcscpy(tmpbuffer, argv0_path);
join(tmpbuffer, env_cfg);
env_file = _Py_wfopen(tmpbuffer, L"r");
if (env_file == NULL) {
errno = 0;
reduce(tmpbuffer);
reduce(tmpbuffer);
join(tmpbuffer, env_cfg);
env_file = _Py_wfopen(tmpbuffer, L"r");
if (env_file == NULL) {
errno = 0;
}
}
if (env_file != NULL) {
/* Look for a 'home' variable and set argv0_path to it, if found */
if (find_env_config_value(env_file, L"home", tmpbuffer)) {
wcscpy(argv0_path, tmpbuffer);
}
fclose(env_file);
env_file = NULL;
}
}
if (pythonhome == NULL || *pythonhome == '\0') {
if (search_for_prefix(argv0_path, LANDMARK))
pythonhome = prefix;
else
pythonhome = NULL;
}
else
wcsncpy(prefix, pythonhome, MAXPATHLEN);
if (envpath && *envpath == '\0')
envpath = NULL;
#ifdef MS_WINDOWS
/* Calculate zip archive path */
if (dllpath[0]) /* use name of python DLL */
wcsncpy(zip_path, dllpath, MAXPATHLEN);
else /* use name of executable program */
wcsncpy(zip_path, progpath, MAXPATHLEN);
zip_path[MAXPATHLEN] = '\0';
len = wcslen(zip_path);
if (len > 4) {
zip_path[len-3] = 'z'; /* change ending to "zip" */
zip_path[len-2] = 'i';
zip_path[len-1] = 'p';
}
else {
zip_path[0] = 0;
}
skiphome = pythonhome==NULL ? 0 : 1;
#ifdef Py_ENABLE_SHARED
machinepath = getpythonregpath(HKEY_LOCAL_MACHINE, skiphome);
userpath = getpythonregpath(HKEY_CURRENT_USER, skiphome);
#endif
/* We only use the default relative PYTHONPATH if we havent
anything better to use! */
skipdefault = envpath!=NULL || pythonhome!=NULL || \
machinepath!=NULL || userpath!=NULL;
#endif
/* We need to construct a path from the following parts.
(1) the PYTHONPATH environment variable, if set;
(2) for Win32, the zip archive file path;
(3) for Win32, the machinepath and userpath, if set;
(4) the PYTHONPATH config macro, with the leading "."
of each component replaced with pythonhome, if set;
(5) the directory containing the executable (argv0_path).
The length calculation calculates #4 first.
Extra rules:
- If PYTHONHOME is set (in any way) item (3) is ignored.
- If registry values are used, (4) and (5) are ignored.
*/
/* Calculate size of return buffer */
if (pythonhome != NULL) {
wchar_t *p;
bufsz = 1;
for (p = PYTHONPATH; *p; p++) {
if (*p == DELIM)
bufsz++; /* number of DELIM plus one */
}
bufsz *= wcslen(pythonhome);
}
else
bufsz = 0;
bufsz += wcslen(PYTHONPATH) + 1;
bufsz += wcslen(argv0_path) + 1;
#ifdef MS_WINDOWS
if (userpath)
bufsz += wcslen(userpath) + 1;
if (machinepath)
bufsz += wcslen(machinepath) + 1;
bufsz += wcslen(zip_path) + 1;
#endif
if (envpath != NULL)
bufsz += wcslen(envpath) + 1;
module_search_path = buf = malloc(bufsz*sizeof(wchar_t));
if (buf == NULL) {
/* We can't exit, so print a warning and limp along */
fprintf(stderr, "Can't malloc dynamic PYTHONPATH.\n");
if (envpath) {
fprintf(stderr, "Using environment $PYTHONPATH.\n");
module_search_path = envpath;
}
else {
fprintf(stderr, "Using default static path.\n");
module_search_path = PYTHONPATH;
}
#ifdef MS_WINDOWS
if (machinepath)
free(machinepath);
if (userpath)
free(userpath);
#endif /* MS_WINDOWS */
return;
}
if (envpath) {
wcscpy(buf, envpath);
buf = wcschr(buf, L'\0');
*buf++ = DELIM;
}
#ifdef MS_WINDOWS
if (zip_path[0]) {
wcscpy(buf, zip_path);
buf = wcschr(buf, L'\0');
*buf++ = DELIM;
}
if (userpath) {
wcscpy(buf, userpath);
buf = wcschr(buf, L'\0');
*buf++ = DELIM;
free(userpath);
}
if (machinepath) {
wcscpy(buf, machinepath);
buf = wcschr(buf, L'\0');
*buf++ = DELIM;
free(machinepath);
}
if (pythonhome == NULL) {
if (!skipdefault) {
wcscpy(buf, PYTHONPATH);
buf = wcschr(buf, L'\0');
}
}
#else
if (pythonhome == NULL) {
wcscpy(buf, PYTHONPATH);
buf = wcschr(buf, L'\0');
}
#endif /* MS_WINDOWS */
else {
wchar_t *p = PYTHONPATH;
wchar_t *q;
size_t n;
for (;;) {
q = wcschr(p, DELIM);
if (q == NULL)
n = wcslen(p);
else
n = q-p;
if (p[0] == '.' && is_sep(p[1])) {
wcscpy(buf, pythonhome);
buf = wcschr(buf, L'\0');
p++;
n--;
}
wcsncpy(buf, p, n);
buf += n;
if (q == NULL)
break;
*buf++ = DELIM;
p = q+1;
}
}
if (argv0_path) {
*buf++ = DELIM;
wcscpy(buf, argv0_path);
buf = wcschr(buf, L'\0');
}
*buf = L'\0';
/* Now to pull one last hack/trick. If sys.prefix is
empty, then try and find it somewhere on the paths
we calculated. We scan backwards, as our general policy
is that Python core directories are at the *end* of
sys.path. We assume that our "lib" directory is
on the path, and that our 'prefix' directory is
the parent of that.
*/
if (*prefix==L'\0') {
wchar_t lookBuf[MAXPATHLEN+1];
wchar_t *look = buf - 1; /* 'buf' is at the end of the buffer */
while (1) {
Py_ssize_t nchars;
wchar_t *lookEnd = look;
/* 'look' will end up one character before the
start of the path in question - even if this
is one character before the start of the buffer
*/
while (look >= module_search_path && *look != DELIM)
look--;
nchars = lookEnd-look;
wcsncpy(lookBuf, look+1, nchars);
lookBuf[nchars] = L'\0';
/* Up one level to the parent */
reduce(lookBuf);
if (search_for_prefix(lookBuf, LANDMARK)) {
break;
}
/* If we are out of paths to search - give up */
if (look < module_search_path)
break;
look--;
}
}
}
/* External interface */
void
Py_SetPath(const wchar_t *path)
{
if (module_search_path != NULL) {
free(module_search_path);
module_search_path = NULL;
}
if (path != NULL) {
extern wchar_t *Py_GetProgramName(void);
wchar_t *prog = Py_GetProgramName();
wcsncpy(progpath, prog, MAXPATHLEN);
prefix[0] = L'\0';
module_search_path = malloc((wcslen(path) + 1) * sizeof(wchar_t));
if (module_search_path != NULL)
wcscpy(module_search_path, path);
}
}
wchar_t *
Py_GetPath(void)
{
if (!module_search_path)
calculate_path();
return module_search_path;
}
wchar_t *
Py_GetPrefix(void)
{
if (!module_search_path)
calculate_path();
return prefix;
}
wchar_t *
Py_GetExecPrefix(void)
{
return Py_GetPrefix();
}
wchar_t *
Py_GetProgramFullPath(void)
{
if (!module_search_path)
calculate_path();
return progpath;
}
/* Load python3.dll before loading any extension module that might refer
to it. That way, we can be sure that always the python3.dll corresponding
to this python DLL is loaded, not a python3.dll that might be on the path
by chance.
Return whether the DLL was found.
*/
static int python3_checked = 0;
static HANDLE hPython3;
int
_Py_CheckPython3()
{
wchar_t py3path[MAXPATHLEN+1];
wchar_t *s;
if (python3_checked)
return hPython3 != NULL;
python3_checked = 1;
/* If there is a python3.dll next to the python3y.dll,
assume this is a build tree; use that DLL */
wcscpy(py3path, dllpath);
s = wcsrchr(py3path, L'\\');
if (!s)
s = py3path;
wcscpy(s, L"\\python3.dll");
hPython3 = LoadLibraryExW(py3path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
if (hPython3 != NULL)
return 1;
/* Check sys.prefix\DLLs\python3.dll */
wcscpy(py3path, Py_GetPrefix());
wcscat(py3path, L"\\DLLs\\python3.dll");
hPython3 = LoadLibraryExW(py3path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
return hPython3 != NULL;
}
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