Tentative fix for gh-223

bjodah · Jul 24, 2023 · e32e4e5 · e32e4e5
1 parent 1ef1bf6
commit e32e4e5
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diff --git a/chempy/tests/test_chemistry.py b/chempy/tests/test_chemistry.py
@@ -58,6 +58,10 @@ def test_Substance__from_formula():
     assert H2O.unicode_name == u"H₂O"
     assert H2O.html_name == u"H<sub>2</sub>O"
 
+    # see https://github.com/bjodah/chempy/issues/223
+    zinc_nitrate = Substance.from_formula("Zn(NO3)2.6H2O")
+    assert zinc_nitrate.composition == {30: 1, 7: 2, 8: 3*2+6, 1: 12}
+
 
 @requires(parsing_library)
 def test_Species():

diff --git a/chempy/util/parsing.py b/chempy/util/parsing.py
@@ -600,14 +600,17 @@ def formula_to_latex(formula, prefixes=None, infixes=None, **kwargs):
     )
 
 
-_unicode_sub = {}
+_unicode_sub = {
+    '.': "\u0323",
+}
 
 for k, v in enumerate("₀₁₂₃₄₅₆₇₈₉"):
     _unicode_sub[str(k)] = v
 
 _unicode_sup = {
     "+": "⁺",
     "-": "⁻",
+    '.': "\u02d9"
 }
 
 for k, v in enumerate("⁰¹²³⁴⁵⁶⁷⁸⁹"):