Python 检查 OpenCV (cv) 的版本
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Checking version of OpenCV (cv)
提问by Venkat kamal
I was checking the version of OpenCV installed previously in a system. I tried to check using
我正在检查系统中先前安装的 OpenCV 版本。我试图检查使用
from cv2 import __version__
Its gave me the following error
它给了我以下错误
No module named cv2
没有名为 cv2 的模块
When I tried import cv, it's not giving me error. Is there a way to know the version?
当我尝试时import cv，它没有给我错误。有没有办法知道版本？
回答by Giordano
回答by charlesreid1
__version__is a variable and a property of the package, not something you can import. The general way to do this (from script or interpreter, Python 2 or Python 3):
__version__是一个变量和包的属性，而不是你可以导入的东西。执行此操作的一般方法（来自脚本或解释器，Python 2 或 Python 3）：
import cv2
print(cv2.__version__)
You can check the version number of any Python package this way using the __version__string. Also note that if you want to know what other special __variables__are available, you can use the dir()function on your module:
您可以使用__version__字符串以这种方式检查任何 Python 包的版本号。另请注意，如果您想知道还有哪些特殊__variables__功能可用，您可以使用dir()模块上的函数：
import cv2
print(dir(cv2))
回答by Oliver Zendel
I had an old setup without a cv2.__version__variable (egg file was used to install opencv 2.4.2 for python 2.7.6 under windows 10; just returned AttributeError: 'module' object has no attribute '__version__')
This worked for all setups:
我有一个没有cv2.__version__变量的旧设置（鸡蛋文件用于在 Windows 10 下为 python 2.7.6 安装 opencv 2.4.2；刚刚返回AttributeError: 'module' object has no attribute '__version__'）这适用于所有设置：
opencv_version = cv2.__version__ if hasattr(cv2, '__version__') else cv2.__file__.replace('\','').replace('/','').split("cv2-")[-1].split("-")[0]
