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# This file is released under the GNU GPL, version 3 or a later revision.
# For further details see the COPYING file
from collections.abc import Set
# for backward compatibility with Python <3.7
from collections import OrderedDict
class OrderedSet(Set):
"""
Ordered collection of distinct hashable objects.
Taken from https://stackoverflow.com/a/10006674
"""
def __init__(self, iterable=()):
self.d = OrderedDict.fromkeys(iterable)
def __len__(self):
return len(self.d)
def __contains__(self, element):
return element in self.d
def __iter__(self):
return iter(self.d)
def __repr__(self):
return str(list(self))
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