In the same PC, if the Python2 and PYTHON3 environments are installed at the same time, an error occurs when the Python command is executed, and the operating system finds the default configuration to perform. How to let Python2 and python3 work together and do not affect each other.
But because of the need for work, we may need multiple Python versions on our personal PC to co-exist, what settings should be made, this chapter on the issue of analysis and use of the introduction
Configuration for 1.python2 and Python3 versions to enter the Python2 installation path as follows
Modify Python.exe, rename to Python2.exe
Access to the Python3 installation path
Rename file Python.exe to Python3.exe,pythonw.exe for Pythonw3.exe
Configure environment variables to configure the paths of both Python2 and Python3 to the PATH environment variable
At this point, we open the Command Line window of the system, enter the command python2 into the Python2 development environment, enter the naming python3 into the Python3 development environment
2. Commands executed when PIP installs the module
Under normal circumstances, we also need to use the python pip command to install and configure third-party modules, at which point the direct execution of PIP will cause an error.
The General installation command syntax is as follows
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Pip Install module name
However, we have installed two versions of Python on the PC and modified the name of the executable file Python.exe, so the direct execution of PIP will result in an error.
2.1. Install a third-party module to Python2
Open the command line tool and execute the following command to install the required modules for Python2
Copy the Code code as follows:
python2-m pip Install (module name)
2.2. Install a third-party module to Python3
Open the command line tool and execute the following command to install the required modules for Python3
Copy the Code code as follows:
python3-m pip Install (module name)
2.3. View the PIP version
python*-M Pip-v
Original link: http://www.jianshu.com/p/9928b741f154
The 2.5 XLRD,XLWT module resembles the setup.pyinstall command:
Python2 setup.py Install
Python3 setup.py Install
Python2.x and 3.x in the same version do not affect the solution (do not use the development Tools IDE installation, easy to clutter)