Variables example added

examples/odt_05_variables.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+#coding:utf-8
+# Purpose:
+# Created: 28.11.14
+# Copyright (C) 2014, Shvein Anton
+# License: MIT license
+
+from __future__ import unicode_literals, print_function
+from ezodf import opendoc
+
+if __name__ == '__main__':
+    doc = opendoc("../tests/data/variables.odt")
+    print("Simple variable 'simple1' = %s" % doc.body.variables['simple1'])
+
+    doc.body.variables['simple1'] = 'My cool variable'
+    print("Simple variable after modification 'simple1' = %s" % doc.body.variables['simple1'])
+
+    print("User field 'user_field1' = %s" % doc.body.userfields['simple1'])
+
+    doc.body.userfields['user_field1'] = 'My cool userfield'
+    print("User field after modification 'user_field1' = %s" % doc.body.userfields['simple1'])