Use importlib.metadata to obtain the version in __init__.py (#1983)

Author: jonathanslenders

setup.py

@@ -1,27 +1,16 @@
 #!/usr/bin/env python
 import os
-import re
 
 from setuptools import find_packages, setup
 
 with open(os.path.join(os.path.dirname(__file__), "README.rst")) as f:
     long_description = f.read()
 
 
-def get_version(package):
-    """
-    Return package version as listed in `__version__` in `__init__.py`.
-    """
-    path = os.path.join(os.path.dirname(__file__), "src", package, "__init__.py")
-    with open(path, "rb") as f:
-        init_py = f.read().decode("utf-8")
-    return re.search("__version__ = ['\"]([^'\"]+)['\"]", init_py).group(1)
-
-
 setup(
     name="prompt_toolkit",
     author="Jonathan Slenders",
-    version=get_version("prompt_toolkit"),
+    version="3.0.50",
     url="https://github.com/prompt-toolkit/python-prompt-toolkit",
     description="Library for building powerful interactive command lines in Python",
     long_description=long_description,

src/prompt_toolkit/__init__.py

@@ -17,6 +17,7 @@
 from __future__ import annotations
 
 import re
+from importlib import metadata
 
 # note: this is a bit more lax than the actual pep 440 to allow for a/b/rc/dev without a number
 pep440 = re.compile(
@@ -28,7 +29,7 @@
 from .shortcuts import PromptSession, print_formatted_text, prompt
 
 # Don't forget to update in `docs/conf.py`!
-__version__ = "3.0.50"
+__version__ = metadata.version("prompt_toolkit")
 
 assert pep440.match(__version__)