Reduce the count of locations where the version number must be update…

…d to exactly one.

See also python-poetry/poetry#2366 (comment) for recommended practice

pyproject.toml

@@ -7,6 +7,7 @@ authors = ["Csonkás Kristóf Gyula <[email protected]>"]
 [tool.poetry.dependencies]
 python = "^3.7"
 sphinx = "^3.5.1"
+importlib-metadata = { version = "^1.0", python = "<3.8" }
 
 [tool.poetry.dev-dependencies]
 pytest = "^3.0"

sphinx_thrift/__init__.py

@@ -1,8 +1,14 @@
+import sys
 from typing import Any, Dict
 
 from sphinx.application import Sphinx
 
-__version__ = '0.1.0'
+if sys.version_info >= (3, 8):
+    from importlib import metadata as importlib_metadata
+else:
+    import importlib_metadata
+
+__version__ = importlib_metadata.version(__name__)
 
 
 def setup(app: Sphinx) -> Dict[str, Any]: