Move the version info into __init__.py

setup.py

@@ -5,14 +5,29 @@ import re
 
 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)
+
+
 # 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="0.1",
+    version=get_version(),
     description="A tensor-network translation module for quantum computing",
     author="The Qibo team",
     author_email="",
@@ -42,4 +57,4 @@ setup(
     python_requires=">=3.7.0",
     long_description=long_description,
     long_description_content_type='text/markdown',
-)
+)