Calculator-IV
已知最早用于辅助算术计算的工具是：骨头（用于清点物品）、鹅卵石和计数板，以及算盘，已知苏美尔人和埃及人在公元前 2000 年之前就已使用算盘。除了安提凯希拉装置（一种 "不合时宜 "的天文装置）之外，计算工具的发展是在 17 世纪初：几何军用罗盘（伽利略发明）、对数和纳皮尔骨（纳皮尔发明）以及滑尺（埃德蒙-冈特发明）。Find more on wikipedia page...
在本系列任务中，您将制作一个初级计算器。
作为输入，您需要按下一连串的按键，而作为该功能的结果，您应该显示出按下最后一个键时屏幕上将显示的内容。注意，这并不总是表达式的结果。实际上，使用实物计算器或应用程序确实有助于你捕捉边缘情况。 ...
CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
checkio sync
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium
Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.
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