Unit test friendly folder structure for Python examples (#237)

Author: sea-bass

example_python/generate_parameter_module_example/__init__.py

@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+import generate_parameter_module_example
+
+print(f'Imported module from: {generate_parameter_module_example.__file__}')
+
+import generate_parameter_module_example.admittance_parameters  # noqa: E402
+
+print('Imported generated parameter module')
+
+import generate_parameter_module_example.minimal_publisher  # noqa: E402
+
+print('Imported minimal publisher module')

example_python/test/test_load_modules.py

@@ -48,6 +48,10 @@ def run(output_file, yaml_file, validation_module=''):
     with open(output_file, 'w') as f:
         f.write(code)
 
+    # Put an __init__.py file if one does not yet exist.
+    init_file = os.path.join(os.path.dirname(output_file), '__init__.py')
+    open(init_file, 'a').close()
+
 
 def parse_args():
     parser = argparse.ArgumentParser()