45.11. Environment Variables
Some of the environment variables that are accepted by the Python interpreter can also be used to affect PL/Python behavior. They would need to be set in the environment of the main PostgreSQL server process, for example in a start script. The available environment variables depend on the version of Python; see the Python documentation for details. At the time of this writing, the following environment variables have an affect on PL/Python, assuming an adequate Python version:
- 
    
PYTHONHOME - 
    
PYTHONPATH - 
    
PYTHONY2K - 
    
PYTHONOPTIMIZE - 
    
PYTHONDEBUG - 
    
PYTHONVERBOSE - 
    
PYTHONCASEOK - 
    
PYTHONDONTWRITEBYTECODE - 
    
PYTHONIOENCODING - 
    
PYTHONUSERBASE - 
    
PYTHONHASHSEED 
  (It appears to be a Python implementation detail beyond the control
   of PL/Python that some of the environment variables listed on
   the
  
   python
  
  man page are only effective in a
   command-line interpreter and not an embedded Python interpreter.)