python 3 7 insert at place in dict

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Sofie
23 Feb 2016
1# Insert dictionary item into a dictionary at specified position: 
2def insert_item(dic, item={}, pos=None):
3    """
4    Insert a key, value pair into an ordered dictionary.
5    Insert before the specified position.
6    """
7    from collections import OrderedDict
8    d = OrderedDict()
9    # abort early if not a dictionary:
10    if not item or not isinstance(item, dict):
11        print('Aborting. Argument item must be a dictionary.')
12        return dic
13    # insert anywhere if argument pos not given: 
14    if not pos:
15        dic.update(item)
16        return dic
17    for item_k, item_v in item.items():
18        for k, v in dic.items():
19            # insert key at stated position:
20            if k == pos:
21                d[item_k] = item_v
22            d[k] = v
23    return d
24
25d = {'A':'letter A', 'C': 'letter C'}
26insert_item(['A', 'C'], item={'B'})
27## Aborting. Argument item must be a dictionary.
28
29insert_item(d, item={'B': 'letter B'})
30## {'A': 'letter A', 'C': 'letter C', 'B': 'letter B'}
31
32insert_item(d, pos='C', item={'B': 'letter B'})
33# OrderedDict([('A', 'letter A'), ('B', 'letter B'), ('C', 'letter C')])
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