code: def test_LookupSeq_is_fast_for_lookups():
      cols = LookupSeq("C" + str(n) for n in range(1000000))
      assert len(cols) == 1000000
      diff = cols.set() - set("C" + str(n) for n in range(100000))
      assert len(diff) == 900000
      start = time.time()
      for c in diff:
          if c in cols:
              assert (
                  time.time() - start < 5
              ), "too slow"  # reaching 0.4 on macOS, using generous upper limit for Jenkins
      duration = time.time() - start
      print(duration)
  
imports: import sys
  import time
  from h2o.utils.shared_utils import is_module_available, can_use_pandas, can_use_numpy, LookupSeq
  from tests import pyunit_utils
label_desc: Use image node_id 3 for calling a global function with example usage: test_LookupSeq_is_fast_for_lookups() without return types