code: def test_delslice(self):
      del self.base[0:1]
      del self.lazy[0:1]
      self.assertEqual(self.lazy, self.base)
  
      del self.base[-1:1:-1]
      del self.lazy[-1:1:-1]
      self.assertEqual(self.lazy, self.base)
  
imports: from operator import eq, ge, gt, le, lt, ne, add, concat, not_, sub, and_, or_, xor
  import os.path
  import sys
  import unittest
  import warnings
  from pytz.lazy import LazyList, LazySet
label_desc: Use image node_id 26 for calling the LazyListTestCase obj's underlying member method code with example usage: obj.test_delslice() without return types