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I'm no Python or CentOS (CloudLinux 6.6 + WHM/cPanel) expert, but I'm trying to install an updated version of Python under CentOS with some extra packages and keeping the system version working.

I managet to get Python 2.7 installed by:

yum groupinstall -y development
yum install -y zlib-dev openssl-devel sqlite-devel bzip2-devel    
wget https://www.python.org/ftp/python/2.7.6/Python-2.7.6.tgz
tar xzf Python-2.7.6.tgz
cd Python-2.7.6
./configure --prefix=/usr/local
make
sudo make alt install

If I run python I get Python 2.6.6 and python2.7 gives me Python 2.7.6. Yum also seems to work fine, so I guess I didn't break the system.

Now, my problem is, I need to get Twistd installed on the Python 2.7, and it needs zope.interface also.

How can I install both of them on the Python 2.7 installation at /usr/local?

Also, after that if I want to run a setup for a twistd plugin and run it under the python 2.7 how should I do it?

Thank you.

TCB13
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  • After your install, does `/usr/local/bin` have `easy_install` or `pip`? If only the former you shd be able to `/usr/local/bin/easy_install pip`, Once you have `pip`, `/usr/local/bin/pip install zope.interface` &c should help. If you don't have `easy_install` see https://pypi.python.org/pypi/setuptools , using `python2.7` where those instructions use just `python`. – Alex Martelli Jan 18 '15 at 17:48
  • This question is getting older but here is a related StackOverflow Q&A where four different versions of python and pip are installed [SO Question](https://stackoverflow.com/questions/61125258/upgrading-pip-removes-other-pythons-pips/61126915#61126915). Virtual environments are still the preferred method when using python. – lwileczek Apr 30 '20 at 15:24

1 Answers1

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I would use virtualenv for this. Here is the steps that you can follow:

  1. install virtualenv:

    sudo yum install virtualenv

    wget bootstrap.pypa.io/get-pip.py

    python get-pip.py --user

    pip install virtualenv

  2. create a virtual env for you app, and precise the python binary you want to use:

    virtualenv -p /usr/local/bin/python2.7 ~/venv

  3. Activate it:

    source ~/venv/bin/activate

  4. now you are in you virtual env. every python command that you will run will use the python2.7 specified in the command line. Also you can now use pip to install python packages (again, only in your virtual env folder):

    pip install Twisted

Dependencies will be handled automatically.

Note that you may need some dev rpm packages as Twisted needs some C compilation.

parkouss
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  • `No package virtualenv available.` :( I guess CloudLinux based on CentOS doesn't have this... – TCB13 Jan 18 '15 at 18:22
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    I suggest that you install pip as indicated here (https://pip.pypa.io/en/latest/installing.html) if you do not have it, and "sudo pip install virtualenv". then go with the rest of the steps, it should be ok. – parkouss Jan 18 '15 at 18:57
  • Can you please replace with 1. with: wget https://bootstrap.pypa.io/get-pip.py; python get-pip.py --no-index --find-links=/local/copies; python get-pip.py --user; This way other users with CloudLinux/CentOS can benefit easily ;) – TCB13 Jan 18 '15 at 20:04
  • You're welcome. :) Are you sure that you needed the two python get-pip.py commands ? Maybe just "python get-pip.py" is sufficient, or the command with the --user flag only ? – parkouss Jan 18 '15 at 20:21
  • I guess the one with the --user flag is enough. I started by running the other one, but it ended up on a error, so I tried the user and it worked just fine ;) – TCB13 Jan 18 '15 at 20:30