Polish version retrieval and long description loading

setup.py

@@ -1,33 +1,30 @@
 from setuptools import setup, find_packages
-import os
 import re
 import pathlib
 
+HERE = pathlib.Path(__file__).parent.absolute()
 PACKAGE = "qibotn"
 
 
 # Returns the qibotn version
-def get_version():
-    """ Gets the version from the package's __init__ file
-    if there is some problem, let it happily fail """
-    VERSIONFILE = os.path.join("src", PACKAGE, "__init__.py")
-    initfile_lines = open(VERSIONFILE, "rt").readlines()
-    VSRE = r"^__version__ = ['\"]([^'\"]*)['\"]"
-    for line in initfile_lines:
-        mo = re.search(VSRE, line, re.M)
-        if mo:
-            return mo.group(1)
+def version():
+    """Gets the version from the package's __init__ file
+    if there is some problem, let it happily fail"""
+    version_file = HERE / "src" / PACKAGE / "__init__.py"
+    version_regex = r"^__version__ = ['\"]([^'\"]*)['\"]"
+
+    initfile = version_file.read_text(encoding="utf-8")
+    matched = re.search(version_regex, initfile, re.M)
+
+    if matched is not None:
+        return matched.group(1)
+    return "0.0.0"
 
 
 # load long description from README
-this_directory = os.path.abspath(os.path.dirname(__file__))
-with open(os.path.join(this_directory, "README.md"), encoding="utf-8") as f:
-    long_description = f.read()
-
-
 setup(
     name="qibotn",
-    version=get_version(),
+    version=version(),
     description="A tensor-network translation module for quantum computing",
     author="The Qibo team",
     author_email="",
@@ -58,6 +55,6 @@ setup(
         ],
     },
     python_requires=">=3.7.0",
-    long_description=long_description,
-    long_description_content_type='text/markdown',
+    long_description=(HERE / "README.md").read_text(encoding="utf-8"),
+    long_description_content_type="text/markdown",
 )