PyVISA缺少的方法

本文介绍了PyVISA缺少的方法的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在用numpy/scipy/ipython运行Win 7 x64，NI 488.2，PyVISA 1.5和python.我试图通过GPIB-USB连接联系吉时利仪器并发送简单命令.但是，当我尝试创建仪器对象时，我发现PyVISA的ResourceManager缺少用于查找，读取和写入仪器的必需方法.

I am running Win 7 x64, NI 488.2, PyVISA 1.5, and python with numpy/scipy/ipython. I am attempting to contact a Keithley instrument through a GPIB-USB connection and send simple commands. However, when I attempt to create the instrument object, I discovered that PyVISA's ResourceManager was missing the required methods used for finding, reading, and writing to instruments.

下面是PyVISA页面上的示例代码，我现在有:

Following the example code on PyVISA's page, right now I have:

import visa rm = visa.ResourceManager my_instrument = rm.get_instrument('GPIB::3')

哪个返回错误，指出get_instrument不存在.使用制表符完成功能可以查看资源管理器rm的可用内容.揭示了它实际上缺少它应具有的所有方法，仅包含rm.init，rm.close和其他一些方法.这些都不执行任何操作或返回4099L.尝试调用rm本身只会打印字符串'ResourceManager()'.

Which returns an error that get_instrument doesn't exist. Using tab-completion to see what is available from the resource manager rm. reveals that it is lacking virtually all the methods it should have, containing only rm.init, rm.close, and a few others. These all either do nothing or return a 4099L. Attempting to call rm itself just prints the string 'ResourceManager()'.

进一步检查后，找不到签证Visa.VisaLibrary()，表明问题是安装不当；但是，在重新下载并重新安装整个软件包(使用pip)后，丢失文件的问题仍然存在.签证模块本身可以很好地加载，只是缺少了大部分重要文件.我是在搞砸安装，还是有其他事情发生?

Upon further examination, visa.VisaLibrary() is nowhere to be found, suggesting the problem is a botched installation; however, upon redownloading and reinstalling the entire package (using pip), the missing file problem persists. The visa module itself loads fine, it's just missing most of its important files. Am I screwing up the installation, or is there something else going on?

推荐答案

事实证明，答案很简单，就像从其他位置下载软件包一样.显然，我使用的网站的DL软件包已损坏或不完整.

Turns out the answer was as simple as downloading the package from a different location. Apparently the site I used had a corrupted or incomplete package up for DL.