Added get_text_joined function.

utils/text.py

@@ -2,11 +2,12 @@
 from __future__ import unicode_literals
 # Erik Stein <code@classlibrary.net>, 2015-2017
 
-from django.utils.text import slugify
 from django.utils import six
 from django.utils.encoding import force_text, smart_text
-from django.utils.functional import allow_lazy
+from django.utils.functional import allow_lazy, keep_lazy_text
 from django.utils.safestring import SafeText
+from django.utils.text import slugify
+from django.utils.translation import ugettext as _, ugettext_lazy
 
 from bs4 import BeautifulStoneSoup
 import translitcodec  # provides 'translit/long', used by codecs.encode()
@@ -35,3 +36,18 @@ def html_entities_to_unicode(html):
     text = smart_text(BeautifulStoneSoup(html, convertEntities=BeautifulStoneSoup.ALL_ENTITIES))
     return text
 html_entities_to_unicode = allow_lazy(html_entities_to_unicode, six.text_type, SafeText)
+
+
+# Translators: This string is used as a separator between list elements
+DEFAULT_SEPARATOR = ugettext_lazy(", ")
+
+@keep_lazy_text
+def get_text_joined(list_, separator=DEFAULT_SEPARATOR, last_word=ugettext_lazy(' and ')):
+    list_ = list(list_)
+    if len(list_) == 0:
+        return ''
+    if len(list_) == 1:
+        return force_text(list_[0])
+    return '%s%s%s' % (
+        separator.join(force_text(i) for i in list_[:-1]),
+        force_text(last_word), force_text(list_[-1]))