From 489dd2e987af4a9a94640eb1742349a0f05242c2 Mon Sep 17 00:00:00 2001
From: Piotr Maslanka <piotr.maslanka@henrietta.com.pl>
Date: Fri, 8 Dec 2017 17:39:09 +0100
Subject: [PATCH] first op

---
 firanka/series/__init__.py   | 27 +++++++++++++++++++++++++++
 firanka/series/exceptions.py | 15 +++++++++++++++
 tests/series/__init__.py     |  8 ++++++++
 tests/series/series.py       | 11 +++++++++++
 4 files changed, 61 insertions(+)
 create mode 100644 firanka/series/__init__.py
 create mode 100644 firanka/series/exceptions.py
 create mode 100644 tests/series/__init__.py
 create mode 100644 tests/series/series.py

diff --git a/firanka/series/__init__.py b/firanka/series/__init__.py
new file mode 100644
index 0000000..7ff0068
--- /dev/null
+++ b/firanka/series/__init__.py
@@ -0,0 +1,27 @@
+# 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
+
+
diff --git a/firanka/series/exceptions.py b/firanka/series/exceptions.py
new file mode 100644
index 0000000..e0e7c53
--- /dev/null
+++ b/firanka/series/exceptions.py
@@ -0,0 +1,15 @@
+# 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
diff --git a/tests/series/__init__.py b/tests/series/__init__.py
new file mode 100644
index 0000000..1c762b1
--- /dev/null
+++ b/tests/series/__init__.py
@@ -0,0 +1,8 @@
+# coding=UTF-8
+from __future__ import print_function, absolute_import, division
+import six
+import logging
+
+logger = logging.getLogger(__name__)
+
+
diff --git a/tests/series/series.py b/tests/series/series.py
new file mode 100644
index 0000000..01f3fdf
--- /dev/null
+++ b/tests/series/series.py
@@ -0,0 +1,11 @@
+# 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)
-- 
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