如何将列表/字符串中的单词数添加到计数器中？

def count_words(text):
    counter = {}  # 初始化计数器

    # 分割文本并遍历单词
    words = text.split()
    for word in words:
        # 更新计数器
        if word in counter:
            counter[word] += 1
        else:
            counter[word] = 1

    return counter

# 测试代码
text = "This is a sample sentence. This sentence is used for testing."
result = count_words(text)
print(result)

{'This': 2, 'is': 2, 'a': 1, 'sample': 1, 'sentence.': 1, 'used': 1, 'for': 1, 'testing.': 1}