如何检查python模块的版本? [英] How to check version of python modules?

问题描述

我刚刚安装了 python 模块:construct 和 statlib 和 setuptools 像这样:

I just installed the python modules: construct and statlib with setuptools like this:

# Install setuptools to be able to download the following
sudo apt-get install python-setuptools

# Install statlib for lightweight statistical tools
sudo easy_install statlib

# Install construct for packing/unpacking binary data
sudo easy_install construct

我希望能够(以编程方式)检查它们的版本.是否有等效于 python --version 我可以从命令行运行?

I want to be able to (programmatically) check their versions. Is there an equivalent to python --version I can run from the command line?

我的python版本是2.7.3.

My python version is 2.7.3.

推荐答案

我建议使用 pip 代替 easy_install.使用 pip，您可以使用

I suggest using pip in place of easy_install. With pip, you can list all installed packages and their versions with

pip freeze

在大多数 linux 系统中，您可以将其传送到 grep(或 Windows 上的 findstr)以查找您感兴趣的特定包的行:

In most linux systems, you can pipe this to grep(or findstr on Windows) to find the row for the particular package you're interested in:

Linux:
$ pip freeze | grep lxml
lxml==2.3

Windows:
c:\> pip freeze | findstr lxml
lxml==2.3

对于单个模块，您可以尝试 __version__属性，但是也有没有它的模块:

For an individual module, you can try the __version__ attribute, however there are modules without it:

$ python -c "import requests; print(requests.__version__)"
2.14.2
$ python -c "import lxml; print(lxml.__version__)"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: 'module' object has no attribute '__version__'

最后，由于您问题中的命令以 sudo 为前缀，因此您似乎正在安装到全局 python 环境.强烈建议查看 python 虚拟环境 管理器，例如 virtualenvwrapper

Lastly, as the commands in your question are prefixed with sudo, it appears you're installing to the global python environment. Strongly advise to take look into python virtual environment managers, for example virtualenvwrapper

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