Raise a ValueError when there is data that was not covered in the format string. Done to match behavior of pre-existing C-based strptime implementations.
diff --git a/Lib/_strptime.py b/Lib/_strptime.py
index 81c105f..4b7a7dd 100644
--- a/Lib/_strptime.py
+++ b/Lib/_strptime.py
@@ -423,6 +423,9 @@
found = format_regex.match(data_string)
if not found:
raise ValueError("time data did not match format")
+ if len(data_string) != found.end():
+ raise ValueError("unconverted data remains: %s" %
+ data_string[found.end():])
year = 1900
month = day = 1
hour = minute = second = 0