python如何调用代码中从未定义的类？
我不知道是否可以将所有代码粘贴到此处，但我正在查看 这个 git 存储库。
如果您查看示例，他们会这样做：
ec2 = EC2('access key id', 'secret key')
...但是没有 EC2 类。但是，在 libcloud\providers.py 中似乎有一个字典将 EC2 映射到 libcloud\ 中找到的 。正确的映射是由 EC2NodeDriver drivers\ec2.pyget_driver(provider) 计算的，但该方法似乎没有在任何地方被调用。
显然，我对 python 很陌生，但对编程却不是。我什至不确定我应该在文档中查找什么来解决这个问题。
I don't know if it is feasable to paste all of the code here but I am looking at the code in this git repo.
If you look at the example they do:
ec2 = EC2('access key id', 'secret key')
...but there is no EC2 class. However, it looks like in libcloud\providers.py there is a dict that maps the EC2 to the EC2NodeDriver found in libcloud\drivers\ec2.py. The correct mapping is calculated by get_driver(provider), but that method doesn't appear to be called anywhere.
I am new to python, obviously, but not to programming. I'm not even sure what I should be looking up in the docs to figure this out.
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example.py包含一个import语句，内容如下：这意味着
EC2类是从libcloud.drivers导入的> 模块。但是，在本例中，libcloud.drivers实际上是一个包（Python 包包含模块），意味着EC2应该在libcloud/drivers/的文件__init__.py中定义，但事实并非如此。这意味着在这种特定情况下，他们的示例代码实际上是错误的。 （我下载了代码，并在运行example.py时遇到导入错误，正如您所看到的，文件libcloud/drivers/__init__.py不包含任何定义至少，至少是EC2定义。）example.pyincludes animportstatement that reads:This means that the
EC2class is imported from thelibcloud.driversmodule. However, in this case,libcloud.driversis actually a package (a Python package contains modules), which means thatEC2should be defined in a file__init__.pyinlibcloud/drivers/, but it's not. Which means that in this specific case, their example code is actually wrong. (I downloaded the code and got an import error when runningexample.py, and as you can see, the filelibcloud/drivers/__init__.pydoes not contain any definitions at all, least of all anEC2definition.)查看 libcloud\examples.py 可能会有所帮助。我看到了这个：
python 'import' 语句从其他 python 模块引入类，在本例中是从 libcloud.drivers 模块引入类。
Checking out the libcloud\examples.py might be helpful. I saw this:
The python 'import' statement brings in the class from other python module, in this case from the libcloud.drivers module.