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Parsing Chemistry
Friday, October 24, 2025 In Python, the chemparse project is available as a “lightweight package for parsing chemical formula strings into python dictionaries” mapping chemical elements to numeric counts. It supports parsing several variants of formula such as: - simple formulas like "H2O" - fractional stoichiometry like "C1.5O3" - groups such as "(CH3)2" - nested groups such as "((CH3)2)3" - square brackets such as "K4[Fe(SCN)6]" I thought it would fun to build a similar functionality using Factor.
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