PyPDF2.errors.DeprecationError: reader.numPages is deprecated and was removed in PyPDF2 3.0.0. Use len(reader.pages) instead.

你可以按照提示使用 `len(reader.pages)` 替换 `reader.numPages`，以下是示例代码：

import PyPDF2

pdf_file = open('example.pdf', 'rb')
pdf_reader = PyPDF2.PdfReader(pdf_file)

# 获取PDF文件中所有页面的文本内容
text = ''
for page in range(len(pdf_reader.pages)):
    page_obj = pdf_reader.pages[page]
    text += page_obj.text

print(text)

pdf_file.close()

需要注意的是，`PdfReader` 相对于 `PdfFileReader` 有一些不同之处，例如获取页面对象的方法等。具体可以参考 PyPDF2 官方文档。

相关问题

PyPDF2.errors.DeprecationError: reader.getNumPages is deprecated and was removed in PyPDF2 3.0.0. Use len(reader.pages) instead.

这个错误是因为 PyPDF2 的 `getNumPages()` 方法已经被废弃，建议使用 `len(reader.pages)` 代替。你可以将代码中的 `getNumPages()` 替换为 `len(reader.pages)`，如下所示：

import PyPDF2

# 打开 PDF 文件
pdf_file = open('example.pdf', 'rb')

# 创建一个 PDF 对象
pdf_reader = PyPDF2.PdfFileReader(pdf_file)

# 获取 PDF 文件中的页数
num_pages = len(pdf_reader.pages)

# 循环遍历每一页，提取文本信息
for page_num in range(num_pages):
    page = pdf_reader.pages[page_num]
    text = page.extract_text()
    print(text)
    
# 关闭 PDF 文件
pdf_file.close()

上述代码将会打开 `example.pdf` 文件，提取每一页的文本信息，并将其打印出来。你可以根据需要修改代码以提取 PDF 文件中的其他信息，如图片、表格等。

PyPDF2.errors.DeprecationError: PdfFileWriter is deprecated and was removed in PyPDF2 3.0.0. Use PdfWriter instead.

This error message indicates that the PdfFileWriter class in PyPDF2 is no longer supported and has been removed in version 3.0.0. Instead, you should use the PdfWriter class.

To fix this error, you need to update your code to use the new PdfWriter class. Here is an example of how to create a PDF file using the PdfWriter class:

from PyPDF2 import PdfFileReader, PdfWriter

# create a new PdfWriter object
writer = PdfWriter()

# add a new page to the PDF
page = writer.add_blank_page(width=612, height=792)

# write some text on the page
page.add_text("Hello, World!")

# save the PDF to a file
with open("output.pdf", "wb") as out:
    writer.write(out)

Note that you may need to modify your existing code to use the new PdfWriter class, depending on what you are trying to do.