打开 Nbextensions， 搜关键字 comment， 会自动弹出Comment/Uncomment Hotkey插件，按照该插件的说明即可。 Comment/Uncomment Adds a new configurable hotkey binding to toggle comments on/off.
Options comment_uncomment_keybinding: keybinding for toggling comments (default: Alt-c) comment_uncomment_indent: add comment at current indent level instead of at beginning of line
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新手上路，请多包涵打开 Nbextensions， 搜关键字 comment， 会自动弹出Comment/Uncomment Hotkey插件，按照该插件的说明即可。
Comment/Uncomment
Adds a new configurable hotkey binding to toggle comments on/off.
Options
comment_uncomment_keybinding: keybinding for toggling comments (default: Alt-c)
comment_uncomment_indent: add comment at current indent level instead of at beginning of line
mac系统里，快捷键是option+c