Change time.strptime() to raise ValueError whenever there is an error in the
format string. Before exceptions generated by the internal code propagated up
to the user and were not helpful.
Closes bug #1340337.
diff --git a/Lib/_strptime.py b/Lib/_strptime.py
index 08d7960..ce8525b 100644
--- a/Lib/_strptime.py
+++ b/Lib/_strptime.py
@@ -287,7 +287,20 @@
_regex_cache.clear()
format_regex = _regex_cache.get(format)
if not format_regex:
- format_regex = time_re.compile(format)
+ try:
+ format_regex = time_re.compile(format)
+ # KeyError raised when a bad format is found; can be specified as
+ # \\, in which case it was a stray % but with a space after it
+ except KeyError, err:
+ bad_directive = err.args[0]
+ if bad_directive == "\\":
+ bad_directive = "%"
+ del err
+ raise ValueError("'%s' is a bad directive in format '%s'" %
+ (bad_directive, format))
+ # IndexError only occurs when the format string is "%"
+ except IndexError:
+ raise ValueError("stray %% in format '%s'" % format)
_regex_cache[format] = format_regex
finally:
_cache_lock.release()