Skip test if no python interpreter. (#35486)

Co-authored-by: Claude <cvandermerwe@google.com>

Author: claudevdm

sdks/python/apache_beam/coders/coders_test_common.py

@@ -24,6 +24,8 @@
 import logging
 import math
 import pickle
+import subprocess
+import sys
 import textwrap
 import unittest
 from decimal import Decimal
@@ -610,6 +612,10 @@ def test_param_windowed_value_coder(self):
 
   def test_cross_process_encoding_of_special_types_is_deterministic(self):
     """Test cross-process determinism for all special deterministic types"""
+
+    if sys.executable is None:
+      self.skipTest('No Python interpreter found')
+
     # pylint: disable=line-too-long
     script = textwrap.dedent(
         '''\
@@ -711,9 +717,6 @@ def __eq__(self, other):
     ''')
 
     def run_subprocess():
-      import subprocess
-      import sys
-
       result = subprocess.run([sys.executable, '-c', script],
                               capture_output=True,
                               timeout=30,