Python 初始化設定¶

PyInitConfig C API¶

在 3.14 版被加入.

Python 可以使用 Py_InitializeFromInitConfig() 來初始化。

The Py_RunMain() function can be used to write a customized Python program.

也參考

PEP 741 "Python Configuration C API".

範例¶

Example of customized Python always running with the Python Development Mode enabled; return -1 on error:

int init_python(void)
{
    PyInitConfig *config = PyInitConfig_Create();
    if (config == NULL) {
        printf("PYTHON INIT ERROR: memory allocation failed\n");
        return -1;
    }

    // Enable the Python Development Mode
    if (PyInitConfig_SetInt(config, "dev_mode", 1) < 0) {
        goto error;
    }

    // Initialize Python with the configuration
    if (Py_InitializeFromInitConfig(config) < 0) {
        goto error;
    }
    PyInitConfig_Free(config);
    return 0;

error:
    {
        // Display the error message.
        //
        // This uncommon braces style is used, because you cannot make
        // goto targets point to variable declarations.
        const char *err_msg;
        (void)PyInitConfig_GetError(config, &err_msg);
        printf("PYTHON INIT ERROR: %s\n", err_msg);
        PyInitConfig_Free(config);
        return -1;
    }
}

建立設定¶

struct PyInitConfig¶: Opaque structure to configure the Python initialization.

PyInitConfig *PyInitConfig_Create(void)¶

Create a new initialization configuration using Isolated Configuration default values.

必須由 PyInitConfig_Free() 來釋放。

在記憶體配置失敗時回傳 NULL。

void PyInitConfig_Free(PyInitConfig *config)¶

釋放初始化配置 config 的記憶體。

如果 config 是 NULL，則不執行任何操作。

錯誤處理¶

int PyInitConfig_GetError(PyInitConfig *config, const char **err_msg)¶

取得 config 錯誤訊息。

如果設定了錯誤，則設置 *err_msg 並回傳 1。
如果沒有設定錯誤，則設定 *err_msg 為 NULL 並回傳 0。

錯誤訊息是 UTF-8 編碼的字串。

If config has an exit code, format the exit code as an error message.

The error message remains valid until another PyInitConfig function is called with config. The caller doesn't have to free the error message.

int PyInitConfig_GetExitCode(PyInitConfig *config, int *exitcode)¶

Get the config exit code.

Set *exitcode and return 1 if config has an exit code set.
Return 0 if config has no exit code set.

Only the Py_InitializeFromInitConfig() function can set an exit code if the parse_argv option is non-zero.

An exit code can be set when parsing the command line failed (exit code 2) or when a command line option asks to display the command line help (exit code 0).

Get Options¶

The configuration option name parameter must be a non-NULL null-terminated UTF-8 encoded string. See Configuration Options.

int PyInitConfig_HasOption(PyInitConfig *config, const char *name)¶

測試配置是否有名為 name 的選項。

如果選項存在則回傳 1，否則回傳 0。

int PyInitConfig_GetInt(PyInitConfig *config, const char *name, int64_t *value)¶

Get an integer configuration option.

Set *value, and return 0 on success.
Set an error in config and return -1 on error.

int PyInitConfig_GetStr(PyInitConfig *config, const char *name, char **value)¶

Get a string configuration option as a null-terminated UTF-8 encoded string.

Set *value, and return 0 on success.
Set an error in config and return -1 on error.

*value can be set to NULL if the option is an optional string and the option is unset.

On success, the string must be released with free(value) if it's not NULL.

int PyInitConfig_GetStrList(PyInitConfig *config, const char *name, size_t *length, char ***items)¶

Get a string list configuration option as an array of null-terminated UTF-8 encoded strings.

Set *length and *value, and return 0 on success.
Set an error in config and return -1 on error.

On success, the string list must be released with PyInitConfig_FreeStrList(length, items).

void PyInitConfig_FreeStrList(size_t length, char **items)¶: Free memory of a string list created by PyInitConfig_GetStrList().

Set Options¶

The configuration option name parameter must be a non-NULL null-terminated UTF-8 encoded string. See Configuration Options.

Some configuration options have side effects on other options. This logic is only implemented when Py_InitializeFromInitConfig() is called, not by the "Set" functions below. For example, setting dev_mode to 1 does not set faulthandler to 1.

int PyInitConfig_SetInt(PyInitConfig *config, const char *name, int64_t value)¶

Set an integer configuration option.

成功時回傳