安装本地版本的Python

Question

I'm trying to install my own version of Python that is independent of the system one on my Mac. Basically, I'm following this Machine Learning Tutorial . I'm in step 4.4 where I'm trying to run the command "python create_lmdb.py" in the command-line, but I get an error saying opencv module not found.

So, then I found the latest openCV Tutorial for Sierra to install openCV properly. I am in step 2 and 3 where I've tried to edit the /.bash_profile with "export PATH=/usr/local/bin:$PATH". I've saved and opened the file to confirm that the file changed. I continued with the tutorial, but when I get to "which python" I find that Python is still the system version with the file path of /usr/bin/python rather than /usr/local/bin/python.

I've spent 3 days on this problem. I've searched around on here and tried various solutions. I've contacted Apple, but they of course couldn't help...or wouldn't. Googled like crazy. I've tried installing a different distribution of Python. I've tried uninstalling and reinstalling Python.

Thanks in advance for any help.

Answer 1

In essence, this is something that you don't want to change. For various reasons changing what your system believes to be "python" is not ideal. A more detailed anser can be found here , but for those that don't want to click through all you need to do is create a bash alias to the path you desire.

ie alias py=/usr/bin/python3 or whatever the actual path is.

Answer 2

我建议您通读此详尽的指南，以在OS X上设置Python（以及可选的其他评论者建议的虚拟环境）。