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-rw-r--r--r_qtl/fileerrors.py9
1 files changed, 9 insertions, 0 deletions
diff --git a/r_qtl/fileerrors.py b/r_qtl/fileerrors.py
index e76676c..c253d71 100644
--- a/r_qtl/fileerrors.py
+++ b/r_qtl/fileerrors.py
@@ -1,5 +1,14 @@
 """QC errors as distinguished from actual exceptions"""
 from collections import namedtuple
 
+InvalidValue = namedtuple(
+    "InvalidValue",
+    ("filename",
+     "rowtitle",
+     "coltitle",
+     "cellvalue",
+     "message"))
+
+
 MissingFile = namedtuple(
     "MissingFile", ("controlfilekey", "filename", "message"))