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# -*- coding: utf-8 -*-
def group_by(value, group, default=None, display_check=None, print_value=None):
groups = {}
if value is None:
return groups
for elem in value:
key = None
if group in elem:
key = elem[group]
else:
key = default
if display_check is None or display_check(key):
output = elem
if print_value is not None:
output = print_value(elem)
groups.setdefault(key, []).append(output)
return groups
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