Refactor setup.py to avoid cyclic dependency on trino.__version__

__version__ is defined in __init__.py in trino module which means that
we cannot easily use the module version in the library code because it
introduces a cyclic dependency.

This change introduces a _version.py which also includes other
meta-information and changes setup.py to read those values from there
instead of inline.

The release script is also updated since the version now needs to be
updated in a different file.

.github/DEVELOPMENT.md

@@ -118,7 +118,7 @@ the code base like `ttl` are allowed and encouraged.
   ```bash
   git fetch -a && git status
   ```
-- Change version in `trino/__init__.py` to a new version, e.g. `0.123.0`.
+- Change version in `trino/_version.py` to a new version, e.g. `0.123.0`.
 - Commit
   ```bash
   git commit -a -m "Bump version to 0.123.0"

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
           VERSION_NUMBER="$(./setup.py --version)"
           NEXT_VERSION_NUMBER="$(echo ${VERSION_NUMBER} | awk -F. -v OFS=. '{$2 += 1 ; print}')"
           echo "Current version: ${VERSION_NUMBER}; Next version number: ${NEXT_VERSION_NUMBER}"
-          sed -i "s/${VERSION_NUMBER}/${NEXT_VERSION_NUMBER}/g" trino/__init__.py
+          sed -i "s/${VERSION_NUMBER}/${NEXT_VERSION_NUMBER}/g" trino/_version.py
 
           # Export for use in next steps
           echo "VERSION_NUMBER=${VERSION_NUMBER}" >> $GITHUB_ENV

setup.py

@@ -12,18 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import ast
-import re
+import os
 import textwrap
+from codecs import open
+from typing import Any
 
 from setuptools import find_packages, setup
 
-_version_re = re.compile(r"__version__\s+=\s+(.*)")
-
-with open("trino/__init__.py", "rb") as f:
-    trino_version = _version_re.search(f.read().decode("utf-8"))
-    assert trino_version is not None
-    version = str(ast.literal_eval(trino_version.group(1)))
+about = {}  # type: dict[str, Any]
+here = os.path.abspath(os.path.dirname(__file__))
+with open(os.path.join(here, "trino", "_version.py"), "r", "utf-8") as f:
+    exec(f.read(), about)
 
 kerberos_require = ["requests_kerberos"]
 sqlalchemy_require = ["sqlalchemy >= 1.3"]
@@ -44,22 +43,22 @@
 ]
 
 setup(
-    name="trino",
-    author="Trino Team",
-    author_email="python-client@trino.io",
-    version=version,
-    url="https://github.com/trinodb/trino-python-client",
+    name=about["__title__"],
+    author=about["__author__"],
+    author_email=about["__author_email__"],
+    version=about["__version__"],
+    url=about["__url__"],
     packages=find_packages(include=["trino", "trino.*"]),
     package_data={"": ["LICENSE", "README.md"]},
-    description="Client for the Trino distributed SQL Engine",
+    description=about["__description__"],
     long_description=textwrap.dedent(
         """
     Client for Trino (https://trino.io), a distributed SQL engine for
     interactive and batch big data processing. Provides a low-level client and
     a DBAPI 2.0 implementation.
     """
     ),
-    license="Apache 2.0",
+    license=about["__license__"],
     classifiers=[
         "Development Status :: 4 - Beta",
         "Intended Audience :: Developers",
@@ -77,7 +76,7 @@
         "Programming Language :: Python :: Implementation :: PyPy",
         "Topic :: Database :: Front-Ends",
     ],
-    python_requires='>=3.7',
+    python_requires=">=3.7",
     install_requires=[
         "backports.zoneinfo;python_version<'3.9'",
         "python-dateutil",

trino/__init__.py

@@ -11,7 +11,28 @@
 # limitations under the License.
 
 from . import auth, client, constants, dbapi, exceptions, logging
+from ._version import (
+    __author__,
+    __author_email__,
+    __description__,
+    __license__,
+    __title__,
+    __url__,
+    __version__,
+)
 
-__all__ = ['auth', 'dbapi', 'client', 'constants', 'exceptions', 'logging']
-
-__version__ = "0.326.0"
+__all__ = [
+    "auth",
+    "client",
+    "constants",
+    "dbapi",
+    "exceptions",
+    "logging",
+    "__author__",
+    "__author_email__",
+    "__description__",
+    "__license__",
+    "__title__",
+    "__url__",
+    "__version__",
+]

trino/_version.py

@@ -0,0 +1,7 @@
+__title__ = "trino"
+__description__ = "Client for the Trino distributed SQL Engine"
+__url__ = "https://github.com/trinodb/trino-python-client"
+__version__ = "0.326.0"
+__author__ = "Trino Team"
+__author_email__ = "python-client@trino.io"
+__license__ = "Apache 2.0"