Python 在虚拟环境中安装matplotlib时出错

正在尝试在虚拟环境中安装

matplotlib

。运行

pip install matplotlib

时，出现以下错误：

zsh: /Users/username/Desktop/tensorflow_tutorials/.venv/bin/pip: bad interpreter:
/Users/username/Desktop/tensorflow/.venv/bin/python3: no such file or directory

tensorflow\u教程

是我在其中创建虚拟环境的目录

我已尝试

pip3安装matplotlib

，并收到以下消息：

zsh: /Users/username/Desktop/tensorflow_tutorials/.venv/bin/pip3: bad interpreter: /Users/username/Desktop/tensorflow/.venv/bin/python3: no such file or directory
Requirement already satisfied: matplotlib in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (3.1.1)
Requirement already satisfied: numpy>=1.11 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from matplotlib) (1.17.3)
Requirement already satisfied: pyparsing!=2.0.4,!=2.1.2,!=2.1.6,>=2.0.1 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from matplotlib) (2.4.2)
Requirement already satisfied: kiwisolver>=1.0.1 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from matplotlib) (1.1.0)
Requirement already satisfied: python-dateutil>=2.1 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from matplotlib) (2.8.0)
Requirement already satisfied: cycler>=0.10 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from matplotlib) (0.10.0)
Requirement already satisfied: setuptools in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from kiwisolver>=1.0.1->matplotlib) (40.8.0)
Requirement already satisfied: six>=1.5 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from python-dateutil>=2.1->matplotlib) (1.12.0)

在

pip安装之前，我已尝试运行
source./.venv/bin/activate
，但也不起作用