如何使用python从PDF中提取文本、表格和图像

import PyPDF2

def extract_text_from_pdf(file_path):
    with open(file_path, 'rb') as file:
        pdf = PyPDF2.PdfFileReader(file)
        text = ''
        for page_num in range(pdf.numPages):
            page = pdf.getPage(page_num)
            text += page.extractText()
    return text

import tabula

def extract_tables_from_pdf(file_path):
    tables = tabula.read_pdf(file_path, pages='all')
    return tables

from PIL import Image
import PyPDF2

def extract_images_from_pdf(file_path):
    images = []
    with open(file_path, 'rb') as file:
        pdf = PyPDF2.PdfFileReader(file)
        for page_num in range(pdf.numPages):
            page = pdf.getPage(page_num)
            if '/XObject' in page['/Resources']:
                x_objects = page['/Resources']['/XObject'].getObject()
                for obj in x_objects:
                    if x_objects[obj]['/Subtype'] == '/Image':
                        image = x_objects[obj]
                        if '/Filter' in image:
                            if image['/Filter'] == '/DCTDecode':
                                img = Image.open(io.BytesIO(image._data))
                                images.append(img)
    return images