如何将每个句子的第一个字母大写？

我正在尝试编写一个程序，将每个句子的第一个字母大写。这是我到目前为止所拥有的，但我不知道如何在句子之间添加句号。例如，如果我输入：

你好。再见

输出是

你好再见

并且期间已经消失。

string=input('Enter a sentence/sentences please:')
sentence=string.split('.')
for i in sentence:
    print(i.capitalize(),end='')

你可以使用nltk进行句子切分 http://www.nltk.org/book/ch03.html#sentence-segmentation:

#!/usr/bin/env python3
import textwrap
from pprint import pprint
import nltk.data # $ pip install http://www.nltk.org/nltk3-alpha/nltk-3.0a3.tar.gz
# python -c "import nltk; nltk.download('punkt')"

sent_tokenizer = nltk.data.load('tokenizers/punkt/english.pickle')
text = input('Enter a sentence/sentences please:')
print("\n" + textwrap.fill(text))
sentences = sent_tokenizer.tokenize(text)
sentences = [sent.capitalize() for sent in sentences]
pprint(sentences)

Output

Enter a sentence/sentences please:
a period might occur inside a sentence e.g., see! and the sentence may
end without the dot!
['A period might occur inside a sentence e.g., see!',
 'And the sentence may end without the dot!']