Fixes circular dependency issue by moving the version to a separate f…

…ile (#704)

* Fixes circular dependency issue by moving the version to a separate file.

pip couldn't install depedencies because sarracenia/__init__.py was importing them, and setup.py was importing sarracenia.

There seem to be better ways of doing this in newer versions of Python (>3.6), but this way seems to be common in packages like Paramiko, Requests, etc.

* Update docs for setting version info

docs/source/Contribution/Development.rst

@@ -1345,7 +1345,7 @@ Set the Version
 This is done to *start* development on a version.
 
 * git checkout v03_wip
-* Edit ``sarracenia/__init__.py`` manually and set the version number.
+* Edit ``sarracenia/_version.py`` manually and set the version number.
 * Edit CHANGES.rst to add a section for the version.
 * run dch to start the changelog for the current version. 
 * git commit -a 

docs/source/fr/Contribution/Développement.rst

@@ -1373,7 +1373,7 @@ Définir la version
 Ceci est fait pour *démarrer* le développement d’une version.
 
 * git checkout v03_wip
-* Modifier ``sarracenia/__init__.py`` manuellement et définissez le numéro de version.
+* Modifier ``sarracenia/_version.py`` manuellement et définissez le numéro de version.
 * Modifier CHANGES.rst pour ajouter une section pour la version.
 * Exécuter dch pour démarrer le journal des modifications de la version actuelle.
 * git commit -a 

sarracenia/__init__.py

@@ -24,7 +24,7 @@
 #  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 #
 #
-__version__ = "3.00.41"
+from ._version import __version__
 
 from base64 import b64decode, b64encode
 import calendar

sarracenia/_version.py

@@ -0,0 +1 @@
+__version__ = "3.00.41"

setup.py

@@ -6,7 +6,7 @@
 from setuptools import find_packages
 from distutils.core import setup
 
-import sarracenia
+#import sarracenia
 
 here = os.path.abspath(os.path.dirname(__file__))
 
@@ -28,14 +28,17 @@ def read(*parts):
     #   https://github.com/pypa/virtualenv/issues/201#issuecomment-3145690
     return codecs.open(os.path.join(here, *parts), 'r').read()
 
+metadata = {}
+with open(os.path.join(here, "sarracenia", "_version.py"), "r") as f:
+    exec(f.read(), metadata)
 
 packages = find_packages()
 print("packages = %s" % packages)
 
 setup(
     name='metpx-sr3',
     python_requires='>=3.6',
-    version=sarracenia.__version__,
+    version=metadata["__version__"],
     description='Subscribe, Acquire, and Re-Advertise products.',
     long_description_content_type='text/x-rst',
     long_description=(read('README.rst')+latest_changelog()),