python引入报错：ModuleNotFoundError:No module named "numpy"

然后通过pip下载安装numpy
pip官网

python get-pip.py
python -m pip install pip
python -m pip install numpy
python -m pip install matplotlib

或者：

brew install numpy --with-python3

写几行代码测试一下吧：

>>> from numpy import *
>>> import operator
>>> a = random.rand(4,4)
>>> print (a)

输出结果：

[[0.05166815 0.23570861 0.45823908 0.30921376]
 [0.67514822 0.7017115  0.9624757  0.02359345]
 [0.06398415 0.89040735 0.47348942 0.93793018]
 [0.38039939 0.57009142 0.88213847 0.73054521]]