How to use 'python filter dict' in Python

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def pyfilter(func, seq):
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    """ filter(func, seq) """
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    if func and seq:
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        return ( filter(func, seq), )
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    else:
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        return ( [], )

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def dict_to_filter_params(d, prefix=''):
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    """
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    Translate a dictionary of attributes to a nested set of parameters suitable for QuerySet filtering. For example:
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        {
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            "name": "Foo",
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            "rack": {
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                "facility_id": "R101"
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            }
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        }
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    Becomes:
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        {
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            "name": "Foo",
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            "rack__facility_id": "R101"
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        }
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    And can be employed as filter parameters:
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        Device.objects.filter(**dict_to_filter(attrs_dict))
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    """
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    params = {}
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    for key, val in d.items():
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        k = prefix + key
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        if isinstance(val, dict):
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            params.update(dict_to_filter_params(val, k + '__'))
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        else:
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            params[k] = val
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    return params