<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _getitem(item, i):
 """Extract value or values from dicts. Covers the case of a single key or multiple keys. If not found, return placeholders instead. """

    if not isinstance(i, (tuple, list)):
        return item.get(i, _none)
    type_ = list if isinstance(item, list) else tuple
    return type_(item.get(j, _none) for j in i)