googleapis
diff --git a/‎README.rst
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+1-2 b/‎README.rst
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+1-2
diff --git a/‎code-of-conduct.md
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-63 b/‎code-of-conduct.md
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-63
diff --git a/‎django_spanner/functions.py
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+1 b/‎django_spanner/functions.py
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diff --git a/‎django_spanner/introspection.py
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diff --git a/‎django_spanner/operations.py
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+4-1 b/‎django_spanner/operations.py
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+4-1
diff --git a/‎django_spanner/schema.py
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+1 b/‎django_spanner/schema.py
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diff --git a/‎docs/conf.py
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-3 b/‎docs/conf.py
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-3
diff --git a/‎noxfile.py
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+12-8 b/‎noxfile.py
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+12-8
@@ -134,8 +134,7 @@ Contributing
 
 Contributions to this library are always welcome and highly encouraged.
 
-See `CONTRIBUTING <CONTRIBUTING.md>`_ for more information on how to get
-started.
+See [CONTRIBUTING][contributing] for more information on how to get started.
 
 Please note that this project is released with a Contributor Code of Conduct.
 By participating in this project you agree to abide by its terms. See the `Code
 
@@ -28,6 +28,7 @@
 
 class IfNull(Func):
     """Represent SQL `IFNULL` function."""
+
     function = "IFNULL"
     arity = 2
 
 
@@ -15,6 +15,7 @@
 
 class DatabaseIntrospection(BaseDatabaseIntrospection):
     """A Spanner-specific version of Django introspection utilities."""
+
     data_types_reverse = {
         TypeCode.BOOL: "BooleanField",
         TypeCode.BYTES: "BinaryField",
 
@@ -25,6 +25,7 @@
 
 class DatabaseOperations(BaseDatabaseOperations):
     """A Spanner-specific version of Django database operations."""
+
     cast_data_types = {"CharField": "STRING", "TextField": "STRING"}
     cast_char_field_without_max_length = "STRING"
     compiler_module = "django_spanner.compiler"
@@ -108,7 +109,9 @@ def bulk_insert_sql(self, fields, placeholder_rows):
         values_sql = ", ".join("(%s)" % sql for sql in placeholder_rows_sql)
         return "VALUES " + values_sql
 
-    def sql_flush(self, style, tables, reset_sequences=False, allow_cascade=False):
+    def sql_flush(
+        self, style, tables, reset_sequences=False, allow_cascade=False
+    ):
         """
         Override the base class method. Returns a list of SQL statements
         required to remove all data from the given database tables (without
 
@@ -13,6 +13,7 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
     The database abstraction layer that turns things like “create a model” or
     “delete a field” into SQL.
     """
+
     sql_create_table = (
         "CREATE TABLE %(table)s (%(definition)s) PRIMARY KEY(%(primary_key)s)"
     )
 
@@ -100,9 +100,6 @@
 # directories to ignore when looking for source files.
 exclude_patterns = [
     "_build",
-    "samples/AUTHORING_GUIDE.md",
-    "samples/CONTRIBUTING.md",
-    "samples/snippets/README.rst",
 ]
 
 # The reST default role (used for this markup: `text`) to use for all
 
@@ -17,13 +17,18 @@
 BLACK_VERSION = "black==19.10b0"
 BLACK_PATHS = [
     "docs",
+    "django_spanner",
     "tests",
     "noxfile.py",
     "setup.py",
 ]
 
+DEFAULT_PYTHON_VERSION = "3.8"
+SYSTEM_TEST_PYTHON_VERSIONS = ["3.8"]
+UNIT_TEST_PYTHON_VERSIONS = ["3.6", "3.7", "3.8"]
 
-@nox.session(python="3.8")
+
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def lint(session):
     """Run linters.
 
@@ -35,7 +40,7 @@ def lint(session):
     session.run("flake8", "django_spanner", "tests")
 
 
-@nox.session(python="3.8")
+@nox.session(python="3.6")
 def blacken(session):
     """Run black.
 
@@ -49,7 +54,7 @@ def blacken(session):
     session.run("black", *BLACK_PATHS)
 
 
-@nox.session(python="3.8")
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def lint_setup_py(session):
     """Verify that setup.py is valid (including RST check)."""
     session.install("docutils", "pygments")
@@ -70,23 +75,22 @@ def default(session):
         "py.test",
         "--quiet",
         "--cov=django_spanner",
-        "--cov=google.cloud",
         "--cov=tests.unit",
         "--cov-append",
         "--cov-config=.coveragerc",
         "--cov-report=",
-        "--cov-fail-under=60",
+        "--cov-fail-under=20",
         os.path.join("tests", "unit"),
         *session.posargs
     )
 
 
-@nox.session(python="3.8")
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def docs(session):
     """Build the docs for this library."""
 
-    session.install("-e", ".")
-    session.install("sphinx<3.0.0", "alabaster", "recommonmark")
+    session.install("-e", ".[tracing]")
+    session.install("sphinx", "alabaster", "recommonmark")
 
     shutil.rmtree(os.path.join("docs", "_build"), ignore_errors=True)
     session.run(
Original file line number	Diff line number	Diff line change
`@@ -13,6 +13,7 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):`
`13`	`13`	`The database abstraction layer that turns things like “create a model” or`
`14`	`14`	`“delete a field” into SQL.`
`15`	`15`	`"""`
	`16`	`+`
`16`	`17`	`sql_create_table = (`
`17`	`18`	`"CREATE TABLE %(table)s (%(definition)s) PRIMARY KEY(%(primary_key)s)"`
`18`	`19`	`)`