Solve the conflict of multiple versions of python
Solve the conflict of multiple versions of python#
Scene analysis##
Generally, the Linux system comes with two versions of python by default. The versions that I follow with the virtual machine system are python2.7 and python3.2, but due to personal habits, I like to use the new version of Python for development. This will cause version conflicts when executing commands.
Problem recurrence###
When I was about to execute a file that I wrote before, an error occurred. It is obvious that the requests dependency is missing, and I will download and install the relevant dependency at this time.
But during the installation, I found that the dependencies I downloaded are stored in the dependency library corresponding to python2.7 by default, that is, after the download is complete, you still hold an error when you execute the python file again, and the related dependency error is not found.
So what we need to solve now is that this relationship does not correspond to the problem
Solve the problem##
Delete the startup file corresponding to the old version (if you need to use multiple versions for development, this is not recommended)
Query the location corresponding to the default python
Find the execution location of python#
which python
-
- /usr/bin/python
delete#
rm /usr/bin/python
Find the python3 location you need to use. The name is related to when you follow it#
which python3
-
- /usr/bin/python3
Establish soft connection#
ln -s /usr/bin/python3 /usr/bin/python
Check version#
python -V
-
- python 3.7.9
pip -V
-
- pip 20.1.1 from /usr/local/python3/lib/python3.7/site-packages/pip (python 3.7)
Re-download requests dependencies###
I am here to download the designated mirror. By default, downloading foreign mirrors is slow and often interrupted.
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple --trusted-host pypi.tuna.tsinghua.edu.cn requests
Start test
Start successfully
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