已修复:

我是个白痴.

FIXED:

I'm an idiot.

"C:\\Users\\User\Desktop\test.pdf"

是无效的路径，因为\ test.pdf中的\ t被解释为制表符... 将更改添加到\ test.pdf后，它可以工作.

is an invalid path because the \t in \test.pdf is interpretted as a tab... It works after adding changing it to \test.pdf.

以后有相同问题的任何人的代码:

Code for anyone with the same problem later:

import os
import subprocess

page = "3"  
path_to_pdf = os.path.abspath("C:\\Users\\User\Desktop\\test.pdf")
path_to_acrobat = os.path.abspath('C:\Program Files (x86)\Adobe\Reader 11.0\Reader\AcroRd32.exe')


process = subprocess.Popen([path_to_acrobat, '/n', '/A', 'page=' + page, path_to_pdf], shell=False, stdout=subprocess.PIPE)

process.wait()