Single-sourcing the version in a __version__.py file

docs/conf.py

@@ -22,7 +22,8 @@
 author = 'graphql-python.org'
 
 # The full version, including alpha/beta/rc tags
-release = '3.0.0a1'
+from gql import __version__
+release = __version__
 
 
 # -- General configuration ---------------------------------------------------

gql/__init__.py

@@ -7,6 +7,7 @@
  - all the transports classes implementing different communication protocols
 """
 
+from .__version__ import __version__
 from .client import Client
 from .gql import gql
 from .transport.aiohttp import AIOHTTPTransport
@@ -15,6 +16,7 @@
 from .transport.websockets import WebsocketsTransport
 
 __all__ = [
+    "__version__",
     "gql",
     "AIOHTTPTransport",
     "Client",

gql/__version__.py

@@ -0,0 +1 @@
+__version__ = "3.0.0a1"

setup.py

@@ -1,3 +1,5 @@
+import os
+
 from setuptools import setup, find_packages
 
 install_requires = [
@@ -28,12 +30,18 @@
     "isort==4.3.21",
     "mypy==0.770",
     "sphinx>=3.0.0,<4",
-    "sphinx_rtd_theme>=0.4,<1"
+    "sphinx_rtd_theme>=0.4,<1",
 ] + tests_require
 
+# Get version from __version__.py file
+current_folder = os.path.abspath(os.path.dirname(__file__))
+about = {}
+with open(os.path.join(current_folder, "gql", "__version__.py"), "r") as f:
+    exec(f.read(), about)
+
 setup(
     name="gql",
-    version="3.0.0a1",
+    version=about["__version__"],
     description="GraphQL client for Python",
     long_description=open("README.md").read(),
     long_description_content_type="text/markdown",