Discriminate between cases where the monoisotopic form is specified d…

…irectly, or by neutron reference
mobiusklein · Nov 25, 2023 · efcfe8a · efcfe8a
1 parent 60fad15
commit efcfe8a
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/brainpy/_c/composition.pyx b/src/brainpy/_c/composition.pyx
@@ -208,15 +208,15 @@ cdef void _isotopes_of(char* element_symbol, IsotopeMap** isotope_frequencies):
 
     freqs = dict()
     py_element_symbol = PyStr_FromString(element_symbol)
-
     try:
         element_data = nist_mass[py_element_symbol]
     except KeyError:
         element_data = nist_mass[py_element_symbol.encode('utf-8')]
 
     for i, mass_freqs in element_data.items():
         if i == 0:
-            mono_neutrons = PyInt_AsLong(mass_freqs[0])
+            if isinstance(mass_freqs, int):
+                mono_neutrons = PyInt_AsLong(mass_freqs[0])
             continue
         if mass_freqs[1] > 0:
             freqs[i] = mass_freqs