Started conversion to OOP.

Created class Radiation with functions time_conversion and radiation

functions.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""Classes used by main program. Handles CSV and GPX processing."""
+
+from datetime import datetime
+
+class Radiation:
+    def __init__(self, timestamp, radiation, local_timezone, si_factor):
+        self.timestamp = self._time_conversion(timestamp, local_timezone)
+        self.radiation = self._radiation(radiation, si_factor)
+
+    def __repr__(self):
+        return '%s %f µS/h' % (str(self.timestamp), self.radiation)
+
+    def _time_conversion(self, timestamp, local_timezone):
+        csv_naive_time = datetime.fromisoformat(timestamp)
+        # Set timezone
+        csv_aware_time = csv_naive_time.astimezone(local_timezone)
+        return csv_aware_time
+
+    def _radiation(self, radiation, si_factor):
+        # Convert CP/M to µS/h using si_factor
+        radiation = round(float(radiation) * si_factor, 2)
+        return radiation
+
+class Position:
+    def __init__(self, timestamp, latitude, longitude):
+        self.timestamp = timestamp
+        self.latitude = latitude
+        self.longitude = longitude