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# -*- coding: utf-8 -*-
from __future__ import absolute_import, unicode_literals
import six
from copy import deepcopy
def merge_dict(a, b):
"""
Recursively merges and returns dict a with dict b.
Any list values will be combined and returned sorted.
:param a: dictionary object
:param b: dictionary object
:return: merged dictionary object
"""
if not isinstance(b, dict):
return b
result = deepcopy(a)
for key, val in six.iteritems(b):
if key in result and isinstance(result[key], dict):
result[key] = merge_dict(result[key], val)
elif key in result and isinstance(result[key], list):
result[key] = sorted(list(set(val) | set(result[key])))
else:
result[key] = deepcopy(val)
return result
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