Add first word to the last of a sentence in python

Question

I have this sentence: 'Johnny Johnny yes papa'. And I want to put the first element of this sentence (as a list) again at the end. This is my code:

sentence = 'Johnny Johnny yes papa'
if len(sentence)>0:
  sentence = sentence.split()
  sentence = sentence.extend(sentence[0])

But it returns me a none object. I tried this:

if len(sentence)>0:
  sentence = sentence.split()
  #sentence = sentence.extend(sentence[0])
  sentence = sentence.append(sentence[0])

And again, it returns none. Please, could you help me with this error? The intended list is: ['Johnny','Johnny','yes','papa','Johnny']

`list` methods mutate the list in-place: https://stackoverflow.com/a/7507299/2745495 — Gino Mempin, Jul 25 '21 at 03:47
Does this answer your question? [Extending list returns None](https://stackoverflow.com/questions/29998421/extending-list-returns-none) — Gino Mempin, Jul 25 '21 at 03:54

score 0 · Accepted Answer · answered Jul 25 '21 at 03:47

0

Because sentence.append(...) doesn't return anything. It applies on place. You just need to replace sentence = sentence.append(sentence[0]) with sentence.append(sentence[0]) line.

answered Jul 25 '21 at 03:47

vszholobov

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Add first word to the last of a sentence in python

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