Configuration and use of multi-version Python coexistence, and version python coexistence

Configuration and use of multi-version Python coexistence, and version python coexistence

We have introduced the development environment for installing python2 and python3 in PC.

If the python 2 and python 3 environments are installed on the same PC at the same time, an error will occur when the python command is executed, and the operating system will find the default configuration for execution. How can we make python2 and python3 work together without affecting each other.

However, due to work requirements, we may need multiple python versions to coexist on our personal PC. What kind of settings should we make? This chapter will analyze and introduce this issue.

1. configuration for coexistence of Python 2 and Python 3

• The installation path for entering python2 is as follows:

  
  Install the file .png under python2.
  

  Modify python.exeand rename it python2.exe.

  
  Python2rename file .png

• Go to the installation path of python3

  
  Python 3 installation path File
  

  The rename file python.exeis python3.exe, and pythondomainexeis pythonw3.exe.

  
  Python3environmental name document .png

• Configure the environment variables and configure the paths of python2 and python3 to the path environment variables.

  
  Environment variable configuration .png

• In this case, open the command line window of the system, enter the command python2 to enter the python2 development environment, and enter the name python3 to enter the python3 development environment.

  
  Environment .png imported into python2and python3

2. commands executed when pip is used to install the module

Under normal circumstances, we also need to use the python pip command to install and configure a third-party module. If Pip is executed directly, an error occurs.

The general installation command syntax is as follows:

Pip install Module name

However, we have installed two pythons on the PC and modified the name of the executable file python.exe. Therefore, an error occurs when executing pip directly.

2.1. Install a third-party module for python2

Open the command line tool and run the following command to install the modules required by python2.

Python2-m pip install Module name

2.2. Install a third-party module for python3

Open the command line tool and run the following command to install the modules required by python3.

Python3-m pip install Module name

2.3. View pip version to execute the pipcommand .png in the specified python.

Author: Damu Moxie
Link: https://www.jianshu.com/p/9928b741f154
Source: Simplified book
Copyright belongs to the author. For commercial reprint, please contact the author for authorization. For non-commercial reprint, please indicate the source.