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-rw-r--r--src/isodate/isoduration.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/isodate/isoduration.py b/src/isodate/isoduration.py
index 6da69f5..c3cfc65 100644
--- a/src/isodate/isoduration.py
+++ b/src/isodate/isoduration.py
@@ -80,7 +80,7 @@ def parse_duration(datestring):
The alternative format does not support durations with years, months or
days set to 0.
"""
- if not isinstance(datestring, basestring):
+ if not isinstance(datestring, (str, unicode)):
raise TypeError("Expecting a string %r" % datestring)
match = ISO8601_PERIOD_REGEX.match(datestring)
if not match: