1 files changed, 32 insertions, 24 deletions
diff --git a/var/spack/repos/builtin/packages/py-nltk/resourcegen.py b/var/spack/repos/builtin/packages/py-nltk/resourcegen.py
index 7a1fa49a3c..d2def9fa0b 100644
--- a/var/spack/repos/builtin/packages/py-nltk/resourcegen.py
+++ b/var/spack/repos/builtin/packages/py-nltk/resourcegen.py
@@ -3,31 +3,39 @@
 # Helper script for maintainers to autogenerate resources for py-nltk
 #
 import hashlib
+import sys
 import urllib.request
 import xml.etree.ElementTree
+from typing import Optional
 
+url = None  # type: Optional[str]
 url = 'https://raw.githubusercontent.com/nltk/nltk_data/gh-pages/index.xml'
-document = urllib.request.urlopen(url).read()
-tree = xml.etree.ElementTree.fromstring(document)
-packages = tree.findall('./packages/package')
-for package in packages:
-    url = package.get('url')
-    name = package.get('id')
-    subdir = package.get('subdir')
-    packagebody = urllib.request.urlopen(url).read()
-    meta_checksum = package.get('checksum')
-    loaded_checksum = hashlib.md5(packagebody).hexdigest()
-    if (meta_checksum == loaded_checksum):
-        output_checksum = hashlib.sha256(packagebody).hexdigest()
-        print("""
-        resource(name='{0}',
-        url='{1}',
-        when='+data',
-        sha256='{2}',
-        destination='nltk_data/{3}',
-        placement='{0}')""".format(name,
-                                   url,
-                                   output_checksum,
-                                   subdir))
-    else:
-        print("""bad {0}""".format(url))
+if url is not None:
+    document = urllib.request.urlopen(url).read()
+    tree = xml.etree.ElementTree.fromstring(document)
+    packages = tree.findall('./packages/package')
+    for package in packages:
+        url = package.get('url')
+        name = package.get('id')
+        subdir = package.get('subdir')
+        if url is None:
+            continue
+        packagebody = urllib.request.urlopen(url).read()
+        meta_checksum = package.get('checksum')
+        loaded_checksum = hashlib.md5(packagebody).hexdigest()
+        if (meta_checksum == loaded_checksum):
+            output_checksum = hashlib.sha256(packagebody).hexdigest()
+            print("""
+            resource(name='{0}',
+            url='{1}',
+            when='+data',
+            sha256='{2}',
+            destination='nltk_data/{3}',
+            placement='{0}')""".format(name,
+                                       url,
+                                       output_checksum,
+                                       subdir))
+        else:
+            print("""bad {0}""".format(url))
+else:
+    sys.exit(1)