ENH: add tzdata to the _hard_dependencies

Author: chilin0525

pandas/__init__.py

@@ -3,7 +3,7 @@
 __docformat__ = "restructuredtext"
 
 # Let users know if they're missing any of our hard dependencies
-_hard_dependencies = ("numpy", "dateutil")
+_hard_dependencies = ("numpy", "dateutil", "tzdata")
 
 for _dependency in _hard_dependencies:
     try:

pandas/tests/test_downstream.py

@@ -187,7 +187,7 @@ def test_yaml_dump(df):
     tm.assert_frame_equal(df, loaded2)
 
 
-@pytest.mark.parametrize("dependency", ["numpy", "dateutil"])
+@pytest.mark.parametrize("dependency", ["numpy", "dateutil", "tzdata"])
 def test_missing_required_dependency(monkeypatch, dependency):
     # GH#61030
     original_import = __import__