Skips a flakky airflow test on macos.

Recent versions of Tensorflow and Airflow makes test fails with segmentation faults.
Airflow doesn't support macos as an execution environment.[1]

[1] apache/airflow#11965 (comment)

PiperOrigin-RevId: 364952307

Author: jiyongjung

tfx/examples/chicago_taxi_pipeline/taxi_pipeline_simple_airflow_e2e_test.py

@@ -14,9 +14,11 @@
 """End to end test for tfx.orchestration.airflow."""
 
 import os
+import platform
 import subprocess
 import time
 from typing import Sequence, Set, Text
+import unittest
 
 import absl
 import tensorflow as tf
@@ -54,6 +56,11 @@ def __exit__(self, exception_type, exception_value, traceback):  # pylint: disab
 _PENDING_TASK_STATES = set(['queued', 'scheduled', 'running', 'none'])
 
 
+@unittest.skipIf(
+    platform.system() == 'Darwin',
+    'Airflow is not compatible with TF in some environments on macos and '
+    'Airflow Executor is not supported on macos. See b/178137745.'
+)
 class AirflowEndToEndTest(test_case_utils.TfxTest):
   """An end to end test using fully orchestrated Airflow."""
 

tfx/tools/cli/handler/base_handler.py

@@ -191,11 +191,11 @@ def _subprocess_call(self,
   def _format_table(self, header: Collection[Any],
                     data: Collection[Collection[Any]]):
 
-    def _format_as_strings(items):
-      return [f' {item} ' for item in items]
+    def _force_strings(items):
+      return [str(item) for item in items]
 
-    header = _format_as_strings(header)
-    data = [_format_as_strings(row) for row in data]
+    header = _force_strings(header)
+    data = [_force_strings(row) for row in data]
 
     max_widths = [len(s) for s in header]
     for row in data:

tfx/tools/cli/handler/base_handler_test.py

@@ -207,13 +207,13 @@ def testFormatTable(self):
     handler = FakeHandler(flags_dict)
     self.assertEqual(
         textwrap.dedent("""\
-      +=====+=====+=======+
-      | abc | d   | False |
-      +=====+=====+=======+
-      | 1   | 234 | None  |
-      +-----+-----+-------+
-      | xxx |     | []    |
-      +=====+=====+=======+
+      +===+===+=====+
+      |abc|d  |False|
+      +===+===+=====+
+      |1  |234|None |
+      +---+---+-----+
+      |xxx|   |[]   |
+      +===+===+=====+
       """),
         handler._format_table(('abc', 'd', False),
                               [[1, '234', None], ['xxx', '', []]]))