Python中"inspect"和"interactive"命令行标志之间的区别

Question

"inspect"和"interactive"标志有什么区别？该sys.flags功能打印他们两个.

根据sys.flags的文档,它们如何都有"-i"标志？

我该如何单独设置它们？如果我使用"python -i",它们都将设置为1.

有关:

• 告诉python是否处于-i模式

Answer 1

根据pythonrun.c对应Py_InspectFlag并Py_InteractiveFlag使用如下:

int Py_InspectFlag; /* Needed to determine whether to exit at SystemError */
/* snip */
static void
handle_system_exit(void)
{
    PyObject *exception, *value, *tb;
    int exitcode = 0;

    if (Py_InspectFlag)
        /* Don't exit if -i flag was given. This flag is set to 0
         * when entering interactive mode for inspecting. */
        return;
    /* snip */
}

SystemExit如果"inspect"标志为true,Python不会退出.

int Py_InteractiveFlag; /* Needed by Py_FdIsInteractive() below */
/* snip */
/*
 * The file descriptor fd is considered ``interactive'' if either
 *   a) isatty(fd) is TRUE, or
 *   b) the -i flag was given, and the filename associated with
 *      the descriptor is NULL or "<stdin>" or "???".
 */
int
Py_FdIsInteractive(FILE *fp, const char *filename)
{
    if (isatty((int)fileno(fp)))
        return 1;
    if (!Py_InteractiveFlag)
        return 0;
    return (filename == NULL) ||
           (strcmp(filename, "<stdin>") == 0) ||
           (strcmp(filename, "???") == 0);
}

如果"interactive"标志为false并且当前输入未与终端关联,则python不会打扰进入"交互"模式(unbuffering stdout,打印版本,显示提示等).

-i选项打开两个标志.如果PYTHONINSPECT环境变量不为空,则"inspect"标志也会打开(请参阅main.c).

基本上它意味着如果您设置PYTHONINSPECT变量并运行您的模块然后python不会退出SystemExit(例如,在脚本的末尾)并显示交互式提示而不是(允许您检查您的模块状态(因此"检查")国旗的名称)).