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  sudo cp /usr/bin/python /usr/bin/python_bak
  sudo rm -rf /usr/bin/python
  sudo ln -s /usr/bin/python3 /usr/bin/python
  sudo apt install -y git python3-pip
  pip3 install scapy
  git clone https://gitee.com/derekwin/mininet.git
  ./mininet/util/install.sh -a