EPEL Python 3.6 with pip on CentOS 7

Installing python3 has always been a bit of a pain on CentOS, particularly if you want a functioning pip3 alongside it.

I have experimented with RPMs from SCL and EPEL as well as installing from source, and had settled on installing the Python 3.4 RPM from EPEL as a good compromise of a reasonably recent version, and semi-regular patch updates.

In December 2017 EPEL released Python 3.6 (epel-announce link) but it isn’t obvious how to get it fully set up. Even Stack Overflow let me down. So I’m documenting it here.

For now I am using the following commands – use sudo before each one if you are running as a non-root user.

# Enable EPEL if required
yum install epel-release

# Install Python 3.6
yum install python36

# Install Pip from the RPM's internal "ensurepip" module
python3.6 -m ensurepip

# Create a symlink so it can be called using python3
ln -s /usr/bin/python3.6 /usr/bin/python3

# Symlink pip3 into /usr/bin for consistency and ease of use with sudo
ln -s /usr/local/bin/pip3 /usr/bin/pip3

You should now have functioning python3 and pip3:

$ pip3 install boto3
Collecting boto3
[...]
Successfully installed boto3-1.8.3

$ python3
Python 3.6.5 (default, Jul 25 2018, 21:22:33) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-28)] on linux
Type "help", "copyright", "credits" or "license" for more information.

The announcement implied that at some point python36 will become the main Python 3 RPM in EPEL. I will try to update this post if/when that happens.

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