Here is the summary of changes.

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I see an error ModuleNotFoundError: No module named sqlparse here. We already have two PRs with adding this dependency:
https://github.com/googleapis/python-spanner/pull/171/files
https://github.com/googleapis/python-spanner/pull/168/files

Looks like I gave you some bad info in googleapis/python-spanner-django#552 (comment), making samples a package causes import errors for other sample modules:

________________ ERROR collecting samples/samples/backup_sample_test.py _______________
ImportError while importing test module 'src/python-spanner/samples/samples/backup_sample_test.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
.pyenv/versions/3.8.2/lib/python3.8/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
backup_sample_test.py:21: in <module>
    import backup_sample
E   ModuleNotFoundError: No module named 'backup_sample'
__________________ ERROR collecting samples/samples/quickstart_test.py _______________
ImportError while importing test module 'src/python-spanner/samples/samples/quickstart_test.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
.pyenv/versions/3.8.2/lib/python3.8/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
quickstart_test.py:21: in <module>
    import quickstart
E   ModuleNotFoundError: No module named 'quickstart'
___________________ ERROR collecting samples/samples/snippets_test.py _______________
ImportError while importing test module 'src/python-spanner/samples/samples/snippets_test.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
.pyenv/versions/3.8.2/lib/python3.8/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
snippets_test.py:21: in <module>
    import snippets
E   ModuleNotFoundError: No module named 'snippets'

Should be fixed now.

Looks like I gave you some bad info in googleapis/python-spanner-django#552 (comment), making samples a package causes import errors for other sample modules:
...
Should be fixed now.

Thanks for commiting code! Errors in importing other sample modules have disappeared.

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One system test create_instance failed with 429 Project 1065521786570 cannot add 1 nodes in region us-central1. Doesn't seem to be related.

Hm-m, it looks like this ResourceExhausted error became permanent. Maybe it'll be better to move DB API system tests to the original test_system.py file and use one instance for all of the system tests?

Hm-m, it looks like this ResourceExhausted error became permanent. Maybe it'll be better to move DB API system tests to the original test_system.py file and use one instance for all of the system tests?

The issue is test instances failing to be deleted for some runs. Manually deleting instances from the test project can resolve this temporarily. For a more long term solution, see #190