From 1df4bcc757ece4ab9c650565dec49496dd7b94a9 Mon Sep 17 00:00:00 2001
From: Joseph Weston <joseph.weston08@gmail.com>
Date: Mon, 20 Nov 2017 10:18:59 +0100
Subject: [PATCH] mention finalization when user tries to use System API from
Builder
Closes #177.
---
kwant/builder.py | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/kwant/builder.py b/kwant/builder.py
index ca6729e2..096d20c8 100644
--- a/kwant/builder.py
+++ b/kwant/builder.py
@@ -1846,6 +1846,19 @@ class Builder:
result.symmetry = self.symmetry
return result
+ # Protect novice users from confusing error messages if they
+ # forget to finalize their Builder.
+
+ @staticmethod
+ def _require_system(*args, **kwargs):
+ """You need a finalized system; Use Builder.finalized() first."""
+ raise TypeError('You need a finalized system; '
+ 'use Builder.finalized() first.')
+
+ hamiltonian = hamiltonian_submatrix = modes = selfenergy = \
+ inter_cell_hopping = cell_hamiltonian = precalculated = \
+ _require_system
+
################ Finalized systems
--
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