Ubuntu 16.04 Exception: tostring() has been removed. Please call tobytes() instead.

Ubuntu 16.04 Exception: tostring() has been removed. Please call tobytes() instead.

pillow版本问题，换成2.9.0就没有问题了

$sudo pip install pillow==2.9.0

############################

pip安装：

方式1： 

$sudo apt install python-pip

方式2：

$wget https://bootstrap.pypa.io/get-pip.py

$python get-pip.py

$pip -V　　#查看pip版本