Add tools/extract_variables.py

tools/extract_variables.py

@@ -0,0 +1,31 @@
+import argparse
+
+import yaml
+
+parser = argparse.ArgumentParser()
+parser.add_argument('file_path')
+
+args = parser.parse_args()
+
+try:
+    from netCDF4 import Dataset
+except ImportError:
+    parser.error('No module named "netCDF4" Use "pip install netCDF4" to install it.')
+
+definitions = []
+with Dataset(args.file_path) as ds:
+    for variable_name, variable in ds.variables.items():
+        definition = {
+            'specifier': variable_name
+        }
+
+        for attribute_name in ['long_name', 'units']:
+            if attribute_name in variable.ncattrs():
+                definition[attribute_name] = variable.getncattr(attribute_name)
+
+        definitions.append(definition)
+
+yaml_string = yaml.dump(definitions, sort_keys=False)
+yaml_string = yaml_string.replace('\n- ', '\n\n- ')
+
+print(yaml_string)