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-rw-r--r--lib/sqlalchemy/processors.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/sqlalchemy/processors.py b/lib/sqlalchemy/processors.py
index cb5f00bde..dd789a44e 100644
--- a/lib/sqlalchemy/processors.py
+++ b/lib/sqlalchemy/processors.py
@@ -24,7 +24,10 @@ def str_to_datetime_processor_factory(regexp, type_):
if value is None:
return None
else:
- return type_(*map(int, rmatch(value).groups(0)))
+ m = rmatch(value)
+ if m is None:
+ raise ValueError("Couldn't parse %s string." % type_.__name__)
+ return type_(*map(int, m.groups(0)))
return process
def boolean_to_int(value):