Arch Linux 系统,用 pacman 安装的 python-pip ,pip -V 输出已经是最新的了:
pip 8.1.2 from /usr/lib/python3.5/site-packages (python 3.5)
但是用 pip freeze 时还是会提示 pip 升级
You are using pip version 8.1.1, however version 8.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
尝试用 pip install --upgrade pip 时,会输出 up-to-date ,神奇的是在这句下面还提示升级

有人碰到过吗