Setting up a virtual environment with virtualenv gives "SyntaxError: invalid syntax python3"

Setting up a virtual environment with virtualenv gives "SyntaxError: invalid syntax python3"

当尝试在 Python 3.6.7 中为 TensorFlow 设置虚拟环境时:

virtualenv --system-site-packages -p python3 ./venv

我收到以下错误:

SyntaxError: invalid syntax python3

尝试使用这个python3 -m venv env