Split iris.fileformats.netcdf into separate load+save submodules.

lib/iris/fileformats/netcdf/__init__.py

@@ -0,0 +1,41 @@
+#
+# This file is part of Iris and is released under the LGPL license.
+# See COPYING and COPYING.LESSER in the root of the repository for full
+# licensing details.
+"""
+Module to support the loading of a NetCDF file into an Iris cube.
+
+See also: `netCDF4 python <https://github.com/Unidata/netcdf4-python>`_
+
+Also refer to document 'NetCDF Climate and Forecast (CF) Metadata Conventions'.
+
+"""
+from .loader import DEBUG, NetCDFDataProxy, load_cubes, logger
+from .saver import (
+    CF_CONVENTIONS_VERSION,
+    MESH_ELEMENTS,
+    SPATIO_TEMPORAL_AXES,
+    CFNameCoordMap,
+    Saver,
+    UnknownCellMethodWarning,
+    parse_cell_methods,
+    save,
+)
+
+# Export all public elements from the loader and saver submodules.
+# NOTE: the separation is purely for neatness and developer convenience; from
+# the user point of view, it is still all one module.
+__all__ = (
+    CF_CONVENTIONS_VERSION,
+    CFNameCoordMap,
+    DEBUG,
+    MESH_ELEMENTS,
+    Saver,
+    SPATIO_TEMPORAL_AXES,
+    NetCDFDataProxy,
+    UnknownCellMethodWarning,
+    load_cubes,
+    logger,
+    parse_cell_methods,
+    save,
+)