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7 changes: 5 additions & 2 deletions tgt/core.py
Original file line number Diff line number Diff line change
Expand Up @@ -19,12 +19,15 @@
from __future__ import division

import bisect
import collections
import warnings
import copy
import math
import operator
import re
try:
from collections.abc import Sequence
except ImportError:
from collections import Sequence


__all__ = [
Expand Down Expand Up @@ -57,7 +60,7 @@ def add_tier(self, tier):

def add_tiers(self, tiers):
'''Add a sequence of tiers.'''
if isinstance(tiers, collections.Sequence):
if isinstance(tiers, Sequence):
for tier in tiers:
self.add_tier(tier)
else:
Expand Down