属性错误： 'bytes'对象没有属性'getPage'

我做了一些编码。Html和烧瓶。接受表单中的pdf文件，并使用烧瓶对其进行水印处理。

这是我的html编码：

<!DOCTYPE html>
<html>
<body>
<p>Click on the "Choose File" button to upload a file:</p>
<form action="/upload_file" method="POST" enctype = "multipart/form-data">
<input type="file" name="file">
<input type="submit">
</form>
</body>
</html>

这是我的烧瓶编码：

@app.route('/upload_file', methods=['POST'])
def upload_file():
pdf_file = request.files['file']
watermark = "watermark.pdf"
merged_file = "merged.pdf"
input_pdf= pdf_file.read()
#input_pdf = PyPDF2.PdfFileReader(open(pdf_file,'rb'))
watermark_file = open(watermark,'rb')
watermark_pdf = PyPDF2.PdfFileReader(watermark_file)
pdf_page = input_pdf.getPage(0)
watermark_page = watermark_pdf.getPage(0)
pdf_page.mergePage(watermark_page)
output = PyPDF2.PdfFileWriter()
output.addPage(pdf_page)
merged_file = open(merged_file,'wb')
output.write(merged_file)
merged_file.close()
watermark_file.close()
input_pdf.close()
return "Success"

追溯：

Traceback (most recent call last):
File "C:UsersUserAppDataLocalProgramsPythonPython39Libsite-packagesflaskapp.py", line 2088, in 
__call__
return self.wsgi_app(environ, start_response)
File "C:UsersUserAppDataLocalProgramsPythonPython39Libsite-packagesflaskapp.py", line 2073, in 
wsgi_app
response = self.handle_exception(e)
File "C:UsersUserAppDataLocalProgramsPythonPython39Libsite-packagesflaskapp.py", line 2070, in 
wsgi_app
response = self.full_dispatch_request()
File "C:UsersUserAppDataLocalProgramsPythonPython39Libsite-packagesflaskapp.py", line 1515, in 
full_dispatch_request
rv = self.handle_user_exception(e)
File "C:UsersUserAppDataLocalProgramsPythonPython39Libsite-packagesflaskapp.py", line 1513, in 
full_dispatch_request
rv = self.dispatch_request()
File "C:UsersUserAppDataLocalProgramsPythonPython39Libsite-packagesflaskapp.py", line 1499, in 
dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "C:UsersUserDesktopabctest.py", line 57, in upload_file
pdf_page = input_pdf.getPage(0)
AttributeError: 'bytes' object has no attribute 'getPage'

如何修复AttributeError:"bytes"对象没有属性"getPage"错误，以及AttributeError:"bytes"对象没有属性"mergePage"错误？

我需要帮助。非常感谢。

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