diff --git a/word2vec_helpers9.28.py b/word2vec_helpers9.28.py
new file mode 100644
index 0000000..98823d3
--- /dev/null
+++ b/word2vec_helpers9.28.py
@@ -0,0 +1,18 @@
+def padding_sentences(input_sentences, padding_token, padding_sentence_length = None):
+#    sentences = [sentence.split(' ') for sentence in input_sentences]
+    padding_sentences=[]
+    #input_sentences为每一句话构成的列表而构成的列表
+    if padding_sentence_length is not None:
+       max_sentence_length = padding_sentence_length
+    else:
+       max_sentence_length = max([len(sentence) for sentence in input_sentences]) 
+#    max_sentence_length = padding_sentence_length if padding_sentence_length is not None else max([len(sentence) for sentence in input_sentences])
+    for sentence in input_sentences:
+        #如果句子长度大于给定的长度最大值，则取前max_sentence_length个字符
+        if len(sentence) > max_sentence_length:
+            sentence = sentence[:max_sentence_length]
+        else:
+        #如果句子长度小于给定的长度最大值，则用给定的字符将原句填充到最大长度
+            sentence.extend([padding_token] * (max_sentence_length - len(sentence)))
+        padding_sentences.append(sentence)
+    return padding_sentences, max_sentence_length