43.10. 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:
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PYTHONHOME
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PYTHONPATH
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PYTHONY2K
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PYTHONOPTIMIZE
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PYTHONDEBUG
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PYTHONVERBOSE
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PYTHONCASEOK
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PYTHONDONTWRITEBYTECODE
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PYTHONIOENCODING
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PYTHONUSERBASE
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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.)