$ ./google-cloud-sdk/install.sh
Welcome to the Google Cloud SDK!
CLOUDSDK_PYTHON=/Library/Frameworks/Python.framework/Versions/3.7/bin/python3
Traceback (most recent call last):
  File "/Users/REDACTED/Downloads/gcloud/./google-cloud-sdk/bin/bootstrapping/install.py", line 12, in <module>
    import bootstrapping
  File "/Users/REDACTED/Downloads/gcloud/google-cloud-sdk/bin/bootstrapping/bootstrapping.py", line 46, in <module>
    from googlecloudsdk.core.updater import update_manager
  File "/Users/REDACTED/Downloads/gcloud/google-cloud-sdk/lib/googlecloudsdk/core/updater/update_manager.py", line 40, in <module>
    from googlecloudsdk.core.resource import resource_printer
  File "/Users/REDACTED/Downloads/gcloud/google-cloud-sdk/lib/googlecloudsdk/core/resource/resource_printer.py", line 42, in <module>
    from googlecloudsdk.core.resource import config_printer
  File "/Users/REDACTED/Downloads/gcloud/google-cloud-sdk/lib/googlecloudsdk/core/resource/config_printer.py", line 25, in <module>
    from googlecloudsdk.core.resource import resource_printer_base
  File "/Users/REDACTED/Downloads/gcloud/google-cloud-sdk/lib/googlecloudsdk/core/resource/resource_printer_base.py", line 47, in <module>
    from googlecloudsdk.core.resource import resource_projector
  File "/Users/REDACTED/Downloads/gcloud/google-cloud-sdk/lib/googlecloudsdk/core/resource/resource_projector.py", line 69, in <module>
    from google.protobuf import json_format as protobuf_encoding
  File "/Users/REDACTED/Downloads/gcloud/google-cloud-sdk/lib/third_party/google/protobuf/json_format.py", line 63, in <module>
    from google.protobuf.internal import type_checkers
  File "/Users/REDACTED/Downloads/gcloud/google-cloud-sdk/lib/third_party/google/protobuf/internal/type_checkers.py", line 60, in <module>
    from google.protobuf.internal import decoder
  File "/Users/REDACTED/Downloads/gcloud/google-cloud-sdk/lib/third_party/google/protobuf/internal/decoder.py", line 95, in <module>
    from google.protobuf.internal import encoder
  File "/Users/REDACTED/Downloads/gcloud/google-cloud-sdk/lib/third_party/google/protobuf/internal/encoder.py", line 73, in <module>
    from google.protobuf.internal import wire_format
  File "/Users/REDACTED/Downloads/gcloud/google-cloud-sdk/lib/third_party/google/protobuf/internal/wire_format.py", line 36, in <module>
    from google.protobuf import descriptor
  File "/Users/REDACTED/Downloads/gcloud/google-cloud-sdk/lib/third_party/google/protobuf/descriptor.py", line 48, in <module>
    from google.protobuf.pyext import _message
ModuleNotFoundError: No module named 'google.protobuf.pyext'

$ /Library/Frameworks/Python.framework/Versions/3.7/bin/python3
Python 3.7.7 (v3.7.7:d7c567b08f, Mar 10 2020, 02:56:16)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from google.protobuf.pyext import _message
>>> # No problem.