Padding

[lima21bd]

def padding(Sentences):
maxlen = 52
for sentence in Sentences:
char = sentence[2]
for x in char:
maxlen = max(maxlen,len(x))
for i,sentence in enumerate(Sentences):
Sentences[i][2] = pad_sequences(Sentences[i][2],52,padding='post')
return Sentences

Please, explain what is actually happening here. It will be beneficial to me if you explain with a example.