Re-added pypi package version fetching script

Jenkinsfile

@@ -51,7 +51,7 @@ pipeline {
             }
             steps {
                 dir('auto-updated-bioconda-recipes') {
-                    sh 'git commit -a -m "Automatically updated autobigs-engine bioconda recipe to $(python ../scripts/package_latest_version.py autoBIGS.engine)."'
+                    sh 'git commit -a -m "Automatically updated autobigs-engine bioconda recipe to $(python ../pypi_latest_ver.py autoBIGS.engine)."'
                     sh 'git push https://${TOKEN}@github.com/Syph-and-VPD-Lab/auto-updated-bioconda-recipes.git update-autobigs-engine'
                 }
             }

pypi_latest_ver.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+
+import sys
+import requests
+import json
+try:
+    from packaging.version import parse
+except ImportError:
+    from pip._vendor.packaging.version import parse
+
+# Courtesy of https://stackoverflow.com/questions/28774852/pypi-api-how-to-get-stable-package-version
+
+URL_PATTERN = 'https://pypi.python.org/pypi/{package}/json'
+
+
+def get_version(package, url_pattern=URL_PATTERN):
+    """Return version of package on pypi.python.org using json."""
+    req = requests.get(url_pattern.format(package=package))
+    version = parse('0')
+    if req.status_code == requests.codes.ok:
+        j = json.loads(req.text.encode(req.encoding or "utf-8"))
+        releases = j.get('releases', [])
+        for release in releases:
+            ver = parse(release)
+            if not ver.is_prerelease:
+                version = max(version, ver)
+    return version
+
+
+if __name__ == '__main__':
+    print(get_version(sys.argv[1]), end="")