first op

firanka/series/__init__.py

+# coding=UTF-8
+from __future__ import print_function, absolute_import, division
+import six
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class DataSeries(object):
+    """
+    Finite mapping from x: REAL => object
+    """
+
+    def __init__(self, data=None):
+        self.data = data or []
+
+    def length(self):
+        """
+        Return timespan
+        :return: float
+        """
+        try:
+            return self.data[-1] - self.data[0]
+        except IndexError:
+            return 0.0
+
+

firanka/series/exceptions.py

+# coding=UTF-8
+from __future__ import print_function, absolute_import, division
+import six
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class FirankaException(Exception):
+    pass
+
+class Empty(FirankaException):
+    """
+    Series was empty
+    """
\ No newline at end of file

tests/series/__init__.py

+# coding=UTF-8
+from __future__ import print_function, absolute_import, division
+import six
+import logging
+
+logger = logging.getLogger(__name__)
+
+

tests/series/series.py

+# coding=UTF-8
+from __future__ import print_function, absolute_import, division
+import six
+import unittest
+from firanka.series import DataSeries
+
+class TestSeries(unittest.TestCase):
+    def test_ds(self):
+
+        ds = DataSeries()
+        self.assertAlmostEqual(ds.length(), 0.0)