Fix datestamp and timestamp notification options

lib/arrow/util.py

@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+from __future__ import absolute_import
+
+import sys
+
+# python 2.6 / 2.7 definitions for total_seconds function.
+
+def _total_seconds_27(td): # pragma: no cover
+    return td.total_seconds()
+
+def _total_seconds_26(td):
+    return (td.microseconds + (td.seconds + td.days * 24 * 3600) * 1e6) / 1e6
+
+
+# get version info and assign correct total_seconds function.
+
+version = '{0}.{1}.{2}'.format(*sys.version_info[:3])
+
+if version < '2.7': # pragma: no cover
+    total_seconds = _total_seconds_26
+else: # pragma: no cover
+    total_seconds = _total_seconds_27
+
+def is_timestamp(value):
+    try:
+        float(value)
+        return True
+    except:
+        return False
+
+# python 2.7 / 3.0+ definitions for isstr function.
+
+try: # pragma: no cover
+    basestring
+
+    def isstr(s):
+        return isinstance(s, basestring)
+
+except NameError: #pragma: no cover
+
+    def isstr(s):
+        return isinstance(s, str)
+
+
+__all__ = ['total_seconds', 'is_timestamp', 'isstr']