使用字符串方法查找文本中的标点符号

text = "这是一段包含标点符号的文本。"
punctuation = [".", ",", "!", "?", ";", ":"]
punctuation_indices = []

for p in punctuation:
    index = text.find(p)
    while index != -1:
        punctuation_indices.append(index)
        index = text.find(p, index + 1)

punctuation_symbols = [text[i] for i in punctuation_indices]