Chemical Analysis
As the input you'll get a chemical formula and a number limit. Your task is to create a sequence of chemical elements, which are in the amount of >= limit in the formula.
Pay attention, that in some formulas brackets (), [] will be used. They have different meaning in chemistry, but from the point of calculating number of atoms they both work the same way - as ordinary parenthesis in mathematical expression. This article will help you to open the brackets and don't make mistakes while counting.
Input: Chemical formula as string (str) and the limit number of atoms as integer (int).
Output: List of certain chemical elements, sorted in the alphabetical order.
Examples:
assert atoms("C2H5OH", 2) == ["C", "H"]
assert atoms("H2O", 2) == ["H"]
assert atoms("Mg(OH)2", 1) == ["H", "Mg", "O"]
assert atoms("K4[ON(SO3)2]2", 4) == ["K", "O", "S"]
How it is used:
For chemical analysis.
Precondition:
1 <= different elements <= 10.
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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