# -*- coding: utf-8 -*-
# Copyright (c) 2019 Satpy developers
# This file is part of satpy.
# satpy is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# satpy is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
# You should have received a copy of the GNU General Public License along with
# satpy. If not, see <http://www.gnu.org/licenses/>.
def flatten_dict(d, parent_key='', sep='_'):
"""Flatten a nested dictionary.
Based on https://stackoverflow.com/a/6027615/5703449
items = 
for k, v in d.items():
new_key = parent_key + sep + k if parent_key else k
if isinstance(v, dict):
items.extend(flatten_dict(v, parent_key=new_key, sep=sep).items())