code: def _get_all_zones():
      zones = []
      for root, dirs, files in os.walk("/usr/share/zoneinfo"):
          for f in files:
              zone_name = ("/".join([root, f])).lstrip(
                  "/usr/share/zoneinfo"
              )
              try:
                  _ = pd.DatetimeTZDtype("ns", zone_name)
              except Exception:
                  continue
              zones.append(zone_name)
      return zones
  
file_path: cudf/python/cudf/cudf/tests/series/test_datetimelike.py
imports: import os
  import pandas
  import pytest
  import cudf
  from cudf import date_range
  from cudf.testing._utils import assert_eq
label_desc: Use image node_id 1 for calling a global function with example usage: _get_all_zones() and returns: zones