如何查看安装了哪个版本的nltk、scikit learn? [英] how to check which version of nltk, scikit learn installed?

问题描述

在shell脚本中，我正在检查是否安装了这个包，如果没有安装则安装它.所以使用 shell 脚本:

In shell script I am checking whether this packages are installed or not, if not installed then install it. So withing shell script:

import nltk
echo nltk.__version__

但它会在 import 行

在linux终端尝试以这种方式查看:

in linux terminal tried to see in this manner:

which nltk

没有想到它已安装.

有没有其他方法可以在shell脚本中验证这个包的安装，如果没有安装，也安装一下.

Is there any other way to verify this package installation in shell script, if not installed, also install it.

推荐答案

import nltk 是 Python 语法，因此在 shell 脚本中不起作用.

import nltk is Python syntax, and as such won't work in a shell script.

要测试nltk和scikit_learn的版本，您可以编写一个Python脚本并运行它.这样的脚本可能看起来像

To test the version of nltk and scikit_learn, you can write a Python script and run it. Such a script may look like

import nltk
import sklearn

print('The nltk version is {}.'.format(nltk.__version__))
print('The scikit-learn version is {}.'.format(sklearn.__version__))

# The nltk version is 3.0.0.
# The scikit-learn version is 0.15.2.

请注意，并非所有 Python 包都保证具有 __version__ 属性，因此对于其他一些包可能会失败，但对于 nltk 和 scikit-learn 至少它会起作用.

Note that not all Python packages are guaranteed to have a __version__ attribute, so for some others it may fail, but for nltk and scikit-learn at least it will work.

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