当使用sudo安装netfilterqueue时我没有收到错误，但是当执行python代码时，它说没有模块，但是当执行相同的命令而不使用sudo时，它说模块已经安装了，但是我需要使用sudo来使用python代码，我把所有的命令行都放在下面。

带有sudo

pi@raspberrypi:~/serveur/firewall $ sudo python3.5 -m  pip install -U git+https://github.com/kti/python-netfilterqueue
Collecting git+https://github.com/kti/python-netfilterqueue
  Cloning https://github.com/kti/python-netfilterqueue to /tmp/pip-26umdc4u-build
Installing collected packages: NetfilterQueue
  Running setup.py install for NetfilterQueue ... done
Successfully installed NetfilterQueue
pi@raspberrypi:~/serveur/firewall $ sudo python3.5 firewall.pyTraceback (most recent call last):
  File "firewall.py",line 1,in <module>
    from netfilterqueue import NetfilterQueue
ImportError: No module named 'netfilterqueue'

没有sudo

pi@raspberrypi:~/serveur/firewall $ python3.5 -m pip install -U git+https://github.com/kti/python-netfilterqueue
Defaulting to user installation because normal site-packages is not writeable
Looking in indexes: https://pypi.org/simple,https://www.piwheels.org/simple
Collecting git+https://github.com/kti/python-netfilterqueue
  Cloning https://github.com/kti/python-netfilterqueue to /tmp/pip-req-build-yad67c46
Building wheels for collected packages: NetfilterQueue
  Building wheel for NetfilterQueue (setup.py) ... done
  Created wheel for NetfilterQueue: filename=NetfilterQueue-0.8.1-cp35-cp35m-linux_armv7l.whl size=79256 sha256=7461466e6fb8ef7cf85d7d7351be96991273863d684aaac3360b3c97534cfa46
  Stored in directory: /tmp/pip-ephem-wheel-cache-ogtjqq3t/wheels/64/80/b2/4dc9e937d58cc96a143e886a09d951be89ad9d7315141d6c2c
Successfully built NetfilterQueue
Installing collected packages: NetfilterQueue
Successfully installed NetfilterQueue-0.8.1
WARNING: You are using pip version 20.2.2; however,version 20.2.3 is available.
You should consider upgrading via the '/usr/bin/python3.5 -m pip install --upgrade pip' command.
pi@raspberrypi:~/serveur/firewall $ ls
firewall.py
pi@raspberrypi:~/serveur/firewall $ python3.5 firewall.pyTraceback (most recent call last):
  File "firewall.py",line 8,in <module>
    nfqueue = NetfilterQueue()
  File "netfilterqueue.pyx",line 162,in netfilterqueue.NetfilterQueue.__cinit__ (netfilterqueue.c:4098)
OSError: Failed to bind family 2. Are you root?

感谢您的帮助