PDFminer从每个页面的标题中获取字体大小(迭代)

from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter
from pdfminer.pdfpage import PDFPage
from pdfminer.converter import TextConverter
from pdfminer.layout import LAParams
from io import StringIO

def extract_text_from_pdf(file_path):
    # 创建一个字符串缓冲区对象
    output_string = StringIO()
    resource_manager = PDFResourceManager()
    codec = 'utf-8'
    laparams = LAParams()
    device = TextConverter(resource_manager, output_string, codec=codec, laparams=laparams)
    interpreter = PDFPageInterpreter(resource_manager, device)

    with open(file_path, 'rb') as file:
        for page in PDFPage.get_pages(file):
            interpreter.process_page(page)
            layout = device.get_result()

            for element in layout:
                if hasattr(element, 'get_text'):
                    text = element.get_text()
                    # 获取标题的字体大小
                    if element.get_text().isupper():
                        font_size = element.fontsize
                        print(f"标题：{text}，字体大小：{font_size}")

    # 关闭设备和缓冲区
    device.close()
    output_string.close()

# 调用函数并指定PDF文件路径
extract_text_from_pdf('file.pdf')