Merge 0747d20 into a8bdbe5

setup.py

@@ -9,8 +9,9 @@
 """
 
 # Standard Python Libraries
+import codecs
 from glob import glob
-from os.path import basename, splitext
+from os.path import abspath, basename, dirname, join, splitext
 
 # Third-Party Libraries
 from setuptools import find_packages, setup
@@ -22,18 +23,28 @@ def readme():
         return f.read()
 
 
-def package_vars(version_file):
-    """Read in and return the variables defined by the version_file."""
-    pkg_vars = {}
-    with open(version_file) as f:
-        exec(f.read(), pkg_vars)  # nosec
-    return pkg_vars
+# Below two methods were pulled from:
+# https://packaging.python.org/guides/single-sourcing-package-version/
+def read(rel_path):
+    """Open a file for reading from a given relative path."""
+    here = abspath(dirname(__file__))
+    with codecs.open(join(here, rel_path), "r") as fp:
+        return fp.read()
+
+
+def get_version(version_file):
+    """Extract a version number from the given file path."""
+    for line in read(version_file).splitlines():
+        if line.startswith("__version__"):
+            delim = '"' if '"' in line else "'"
+            return line.split(delim)[1]
+    raise RuntimeError("Unable to find version string.")
 
 
 setup(
     name="example",
     # Versions should comply with PEP440
-    version=package_vars("src/example/_version.py")["__version__"],
+    version=get_version("src/example/_version.py"),
     description="Example python library",
     long_description=readme(),
     long_description_content_type="text/markdown",

src/example/__init__.py

@@ -1,4 +1,8 @@
 """The example library."""
+# We disable a Flake8 check for "Module imported but unused (F401)" here because
+# although this import is not directly used, it populates the value
+# package_name.__version__, which is used to get version information about this
+# Python package.
 from ._version import __version__  # noqa: F401
 from .example import example_div