Added KeyError check

diff --git a/testing/cdna.py b/testing/cdna.py
index 6fdfecaaaebba090b2c873581db7dc8d1f0d79f4..a1f7e033e887875f1ffbd3f601c531c9ef9f59b7 100755 (executable)
--- a/testing/cdna.py
+++ b/testing/cdna.py
@@ -13,4 +13,6 @@ def complement(sequence):
             cdna += COMPLEMENTS[ch]
         return cdna
     except TypeError:
-        print 'The input is not a sequence e.g. a string or list'
+        raise ValueError('The input is not a sequence e.g. a string or list')
+    except KeyError:
+        raise ValueError('The input is not a sequence of G,T,C,A')