bpo-36239: Skip comments in gettext infos (GH-12255)

Lib/gettext.py

@@ -417,6 +417,9 @@ class GNUTranslations(NullTranslations):
                     item = b_item.decode().strip()
                     if not item:
                         continue
+                    # Skip over comment lines:
+                    if item.startswith('#-#-#-#-#') and item.endswith('#-#-#-#-#'):
+                        continue
                     k = v = None
                     if ':' in item:
                         k, v = item.split(':', 1)

Lib/test/test_gettext.py

@@ -684,6 +684,19 @@ class GNUTranslationParsingTest(GettextBaseTest):
             # If this runs cleanly, the bug is fixed.
             t = gettext.GNUTranslations(fp)
 
+    def test_ignore_comments_in_headers_issue36239(self):
+        """Checks that comments like:
+
+            #-#-#-#-#  messages.po (EdX Studio)  #-#-#-#-#
+
+        are ignored.
+        """
+        with open(MOFILE, 'wb') as fp:
+            fp.write(base64.decodebytes(GNU_MO_DATA_ISSUE_17898))
+        with open(MOFILE, 'rb') as fp:
+            t = gettext.GNUTranslations(fp)
+            self.assertEqual(t.info()["plural-forms"], "nplurals=2; plural=(n != 1);")
+
 
 class UnicodeTranslationsTest(GettextBaseTest):
     def setUp(self):

Misc/NEWS.d/next/Library/2019-03-09-23-51-27.bpo-36239.BHJ3Ln.rst

@@ -0,0 +1 @@
+Parsing .mo files now ignores comments starting and ending with #-#-#-#-#.