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从命令行运行Python找不到库

[英]Running Python from the command line doesn't find libraries

我知道我已经安装了matplotlib(例如,我可以使用ipython进行导入),但是今天早些时候我升级到了python 3.7,看起来好像坏了一些东西:

> python plot_spectra.py 
Traceback (most recent call last):
  File "plot_spectra.py", line 3, in <module>
    import matplotlib.pyplot as plt
ModuleNotFoundError: No module named 'matplotlib'


~ > which python
/Users/npr1/anaconda3/bin/python
~ > which python2
/usr/local/bin/python2
~ > which python3
/Library/Frameworks/Python.framework/Versions/3.7/bin/python3

有什么建议吗? 谢谢!

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