小编BTa*_*les的帖子

我有一个数据框，其中索引不是数字而是字符串（特别是国家/地区名称），并且它们都是唯一的。给定一个国家/地区的名称，如何找到其行号（索引的“数字”值）？

我尝试过df[df.index == 'country_name'].index，但这不起作用。

我不确定为什么这个管道会中断，我已经根据网站的确切说明在 Linux 上安装了 gstreamer，有什么想法吗？

gst-launch-1.0 v4l2src device=/dev/video0 ! videoscale ! video/x-raw, width=2592, height=600 ! autovideosink -v
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data stream error.
Additional debug info:
gstbasesrc.c(3055): gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming stopped, reason not-negotiated (-4)
Execution ended after 0:00:00.000093207
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

如果我把它改成：

gst-launch-1.0 v4l2src …

.ipynb 文件的代码：

检测到Python：

该代码在 jupyter 笔记本中具有颜色：

我尝试在 anaconda 环境中的 VS Code 中设置 Jupyter Notebook。我尝试过 - Python: 选择解释器并选择了我的 anaconda 环境。确保 python 在环境中：python --version: Python 3.8.8。尝试单击 CVE（右下角）更改为 python（图 2）。代码的着色在 Jupyter Notebook 的交互窗口中运行良好（图 3）。

Traceback (most recent call last):
  File "/opt/ros/melodic/share/gencpp/cmake/../../../lib/gencpp/gen_cpp.py", line 50, in <module>
    sys.argv, msg_template_map, srv_template_map)
  File "/opt/ros/melodic/lib/python2.7/dist-packages/genmsg/template_tools.py", line 213, in generate_from_command_line_options
    generate_from_file(argv[1], options.package, options.outdir, options.emdir, options.includepath, msg_template_dict, srv_template_dict)
  File "/opt/ros/melodic/lib/python2.7/dist-packages/genmsg/template_tools.py", line 154, in generate_from_file
    _generate_msg_from_file(input_file, output_dir, template_dir, search_path, package_name, msg_template_dict)
  File "/opt/ros/melodic/lib/python2.7/dist-packages/genmsg/template_tools.py", line 99, in _generate_msg_from_file
    search_path)
  File "/opt/ros/melodic/lib/python2.7/dist-packages/genmsg/template_tools.py", line 77, in _generate_from_spec
    interpreter = em.Interpreter(output=ofile, globals=g, options={em.RAW_OPT:True,em.BUFFERED_OPT:True})
AttributeError: 'module' object has no attribute 'RAW_OPT'
Traceback (most recent call last):
  File "/opt/ros/melodic/share/gencpp/cmake/../../../lib/gencpp/gen_cpp.py", line 50, in <module>
    sys.argv, msg_template_map, srv_template_map)
  File "/opt/ros/melodic/lib/python2.7/dist-packages/genmsg/template_tools.py", …