在Python中，每个句子的第一个字母大写，而不更改句子的其余部分

sentence = "hello world. this is a test."
capitalized_sentence = sentence.capitalize()
print(capitalized_sentence)  # 输出: Hello world. this is a test.

import re

def capitalize_sentences(text):
    def repl(match):
        return match.group(1).upper() + match.group(2)
    
    pattern = r'([.!?])\s*(\w)'
    return re.sub(pattern, repl, text)

text = "hello world. this is a test. another sentence!"
capitalized_text = capitalize_sentences(text)
print(capitalized_text)  # 输出: Hello world. This is a test. Another sentence!

sentence = "hello world. this is a test."
capitalized_sentence = sentence.title()
print(capitalized_sentence)  # 输出: Hello World. This Is A Test.

def capitalize_first_letter_of_sentences(text):
    sentences = text.split('. ')
    capitalized_sentences = []
    for sentence in sentences:
        if sentence:
            capitalized_sentence = sentence[0].upper() + sentence[1:]
            capitalized_sentences.append(capitalized_sentence)
        else:
            capitalized_sentences.append('')
    return '. '.join(capitalized_sentences)

text = "hello world. this is a test. another sentence!"
capitalized_text = capitalize_first_letter_of_sentences(text)
print(capitalized_text)  # 输出: Hello world. This is a test. Another sentence!