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This article mainly explains "Python 2.7.6 upgrade Python 3.5.2 method under Linux environment", the explanation content in the article is simple and clear, easy to learn and understand, please follow the idea of Xiaobian slowly in-depth, together to study and learn "Python 2.7.6 upgrade Python 3.5.2 method under Linux environment"!

demand

Server: Linux environment is some of the Python2 version comes with other versions of Python sometimes just installed, when the new version comes out, in the development time will often choose the new version of the software to install.

reason

When selecting a new version of software for installation during development, the following considerations are taken into account.

Some third-party software libraries of the old version will be updated with the new version of the software, and the third-party libraries supported by the old version will not be maintained and updated. Later, in the process of using, if bugs appear, it will take a lot of effort to solve them.

step

Based on the above requirements, I will produce Python 2.7.6 upgrade Python 3.5.2 on the VM, the main steps are as follows:

Go to Python's official website https://www.example.com to download the new version of Python, Python 3.5.2, just released in 2016. www.python.org/

1. Upload python 3.5.2.tgz to linux directory

2. Unzip tar -zxvf python3.5.2.tgz

3. Enter the unzipped python directory cd python 3.5.2

4. install compilation

(1) Operation./ Configure Command

After the configure command is executed, a Makefile file is generated, which is mainly used by the next make command. Open Makefile and you will find that there is a build order, Linux needs to build program components in the order specified by Makefile.

Note: Sometimes when executing this command, an error will be reported, usually without permission, in the python directory first execute chmod 777 *, and then execute the command again, successfully passed

(2) Run the make command

Make actually compiles your source code and generates an execution file.

(3) Run the make install command

Make install actually copies the generated executable files to the necessary directories on the linux system, such as/usr/local/bin, so that all users can run the program.

5. Create links to new versions of Python

(1) At this time, the old version is not overwritten, and then the original/usr/local/bin/python link is changed to another name.

Run mv /usr/local/bin/python /usr/local/bin/python_old2

(2) Create links to new versions of Python

Run ln -s python install directory/bin/python3.5 /usr/local/bin/python

6. verification

typing Python

As can be seen from the above figure, Python 3.5.2 upgrade was successfully installed.

Thank you for reading, the above is "Python 2.7.6 upgrade Python 3.5.2 method under Linux environment" content, after learning this article, I believe that everyone on Linux environment Python 2.7.6 upgrade Python 3.5.2 method this problem has a deeper understanding, the specific use of the situation also needs to be verified by practice. Here is, Xiaobian will push more articles related to knowledge points for everyone, welcome to pay attention!

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