放弃当前行，新起一行
control-C will kill the current prompt, abort what you're typing and start a new prompt, and set the return code to 1.
删光标前的东西
control-U deletes everything before the cursor.
The deleted command will be stored in a buffer. Press control-Y to paste the deleted command.
删光标后的东西
control-K deletes everything from the cursor to the end of the line. (Optional: Press End or control-E to jump to the end of the input first.)
查看 python3 的位置
代码语言：javascript复制which python3创建虚拟设备 Creating Virtual Environments
https://docs.python.org/3/tutorial/venv.html
创建成功前面会提示进入了venv
