Detailed tutorial on installing Python 3.6.6 from scratch on CentOS 7.5

ps: The environment is as the title

Install possible dependencies

yum install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel gcc gcc-c++ openssl-devel

Download the compressed file

Get the download link

Here we select Python 3.6.6 from the Python official website. The download address is as follows

https://www.python.org/ftp/python/3.6.6/Python-3.6.6.tar.xz

You can also choose your own version. The official FTP is

https://www.python.org/ftp/python/

Download the compressed file

Now we enter CentOS (the directory is irrelevant at this time), the command is as follows

wget https://www.python.org/ftp/python/3.6.6/Python-3.6.6.tar.xz

Download completed, go to next step

Unzip the compressed file

Mobile compressed file

I personally install Python in the /usr directory. First, we move the Python compressed package to the specified folder. We need to use the mv command to move it.

mv Current position Moved position

mv /root/Python-3.6.6.tar.xz /usr/

Enter the directory

We use the cd command to enter the target folder and use ls to view all files in the folder.

cd /
ls
cd usr/
ls

We can see that the move has been successful.

Unzip

Decompress tar.xz and use the xz -d command to decompress the tarball.

xz -d Python-3.6.6.tar.xz

We use ls again to view

We then decompress the tar package using the tar command

tar -xvf Python-3.6.6.tar

The screen scrolls quickly and the decompression is completed

We can see that there is already a Python-3.6.6 directory

Compile and install Python

Let's go into the python directory first

cd Python-3.6.6/

Add Configuration

In fact, it is to compile and install Python to the specified directory, here specified as /usr/python

./configure --prefix=/usr/python

ps: If an error occurs (as shown below), you need to install gcc first

yum install -y gcc

Correct result

Compile and install

Using make command

make

Next you need to wait

After completion, use the make install command

make install

wait

If a zlib error occurs (as shown below), you need to install zlib first and then re-install it.

yum -y install zlib*

If a ctypes error occurs, you need to install libffy first

yum install libffi-devel -y

Python installation completed screenshot

At this point, we return to the previous directory. If you see a python folder, it means success. If you lack dependencies during compilation and installation, there may be no folder. In this case, you need to start over from adding configuration.

Creating a Soft Link

Creating a soft link is equivalent to configuring environment variables

ln -s /usr/python/bin/python3 /usr/bin/python3

At this point we can enter python by typing python3 in any directory

Let's test import _ssl

Perfect!

We also need to configure pip's soft link to use pip

ln -s /usr/python/bin/pip3 /usr/bin/pip3

Install pymysql test using pip3

Summarize

The above is the tutorial on how to install Python 3.6.6 from scratch on CentOS 7.5. I hope it will be helpful to you. If you have any questions, please leave me a message and I will reply to you in time. I would also like to thank everyone for their support of the 123WORDPRESS.COM website!