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如何修复 PyVISA 'ValueError: Could not locate a VISA implementation. Install either the NI binary or pyvisa-py.'

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问题：

你正在尝试使用 PyVISA 连接到仪器，但你看到类似这样的错误消息

pyvisa_traceback.txt
Traceback (most recent call last):
  File "TestPyVISA.py", line 3, in <module>
    rm = visa.ResourceManager()
  File "/usr/local/lib/python3.7/dist-packages/pyvisa/highlevel.py", line 1526, in __new__
    visa_library = open_visa_library(visa_library)
  File "/usr/local/lib/python3.7/dist-packages/pyvisa/highlevel.py", line 1493, in open_visa_library
    wrapper = _get_default_wrapper()
  File "/usr/local/lib/python3.7/dist-packages/pyvisa/highlevel.py", line 1470, in _get_default_wrapper
    raise ValueError('Could not locate a VISA implementation. Install either the NI binary or pyvisa-py.')
ValueError: Could not locate a VISA implementation. Install either the NI binary or pyvisa-py.

解决方案

安装 pyvisa-py Python 包：

install_pyvisa_py.sh
pip install -U pyvisa-py

或者，如果你仍在使用 Python 2.x：

install_pyvisa_py_py2.sh
pip2 install pyvisa-py
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