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Recursive dictionary merge in Python
import collections
def dict_merge(dct, merge_dct):
""" Recursive dict merge. Inspired by :meth:``dict.update()``, instead of
updating only top-level keys, dict_merge recurses down into dicts nested
to an arbitrary depth, updating keys. The ``merge_dct`` is merged into
:param dct: dict onto which the merge is executed
:param merge_dct: dct merged into dct
:return: None
for k, v in merge_dct.iteritems():
if (k in dct and isinstance(dct[k], dict)
and isinstance(merge_dct[k], collections.Mapping)):
dict_merge(dct[k], merge_dct[k])
dct[k] = merge_dct[k]
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