FIXING PYTHON INITIALIZATION PROBLEMS

 After a fresh install of Clarisse, Clarisse may prompt you with an error message regarding a Python installation issue.

Please note that sometimes this error message is not displayed however, you only can see File > Quit in Clarisse’s application main menu bar. These problems typically occur when:

• Python is not properly installed on your operating system
• The location of the python path is not properly set

To find the right solution we have first to identify what’s wrong with your installation.

A. Checking Python Installation

• Open a Terminal, type python and press the Enter key.

If you have a message like:

-bash: python: command not found

Python is not installed. Go to Step B

If you have a message such as:

Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 12:39:47) [GCC 4.2.1 (Red Hat 4.8.5-16) (dot 3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

Python is properly installed you can directly skip to Step C. 

B. Making a clean installation of Python 2.7

• Python installation process depends on your linux distribution.
  
  • On Centos type in a terminal: sudo yum -y install python.x86_64
  • On Ubuntu type in a terminal: sudo apt install python2.7
  • On OpenSuse just follow this link
  • For other distros please use the corresponding distros community forums.
• Launch Clarisse and if the problem persists go to Step C
  
  

C. Editing clarisse.env file

• Open a Terminal type python and press the Enter key.
  Our goal here is to find where python is installed. Type import sys;print sys.path and press Enter key. You should get something like this:
  
  ['', '/usr/lib64/python27.zip', '/usr/lib64/python2.7', '/usr/lib64/python2.7/plat-linux2', '/usr/lib64/python2.7/lib-tk', '/usr/lib64/python2.7/lib-old', '/usr/lib64/python2.7/lib-dynload', '/usr/lib64/python2.7/site-packages', '/usr/lib64/python2.7/site-packages/gtk-2.0', '/usr/lib/python2.7/site-packages']
  
  In this example the location where python is installed is: /usr/lib64/
Store this path carefully
  
  
• Now you have to edit clarisse.env file. Go to this location: ~/.isotropix/clarisse
  You should see one folder for each version of Clarisse you have installed (for example 3.5, 3.6...). Go to the one you can’t launch due to the python error.
  
  
• Open clarisse.env file and create it if it doesn’t exist.
• Replace its content by:
  
  PYTHONHOME=PythonInstallLocation
PYTHONPATH=PythonInstallLocation/lib
IX_SHELF_CONFIG_FILE=$CLARISSE_BIN_DIR/shelves/shelf.cfg
IX_MENU_CONFIG_FILE=$CLARISSE_BIN_DIR/python/menus/init_menus.py


• Replace PythonInstallLocation by the path you carefully stored.
• You should now be able to launch Clarisse properly! Please note that you will be probably requested to set your licence back.