Use importlib to set __version__; bump to 0.4.0b1

Replace the hardcoded __version__ with importlib.metadata.version("pyDataverse") so the runtime reports the installed distribution version and raise a RuntimeError if the package isn't installed. Also update the project version to 0.4.0b1 in pyproject.toml to mark a pre-release.

Author: JR-1991

pyDataverse/__init__.py

@@ -8,6 +8,7 @@
 from __future__ import absolute_import
 
 import warnings
+from importlib.metadata import PackageNotFoundError, version
 
 import nest_asyncio
 
@@ -30,11 +31,16 @@
 __email__ = "stefan.kasberger@univie.ac.at"
 __copyright__ = "Copyright (c) 2019 Stefan Kasberger"
 __license__ = "MIT License"
-__version__ = "0.3.5"
+
 __url__ = "https://github.com/GDCC/pyDataverse"
 __download_url__ = "https://pypi.python.org/pypi/pyDataverse"
 __description__ = "A Python module for Dataverse."
 
+try:
+    __version__ = version("pyDataverse")
+except PackageNotFoundError:
+    raise RuntimeError("pyDataverse is not installed")
+
 __all__ = [
     "Dataset",
     "Dataverse",

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "pyDataverse"
-version = "0.4.0"
+version = "0.4.0b1"
 description = "A Python module for Dataverse."
 readme = "README.md"
 license = { text = "MIT" }