# Documentation While looking for ways to control the new REPL, I found that `PYTHON_BASIC_REPL` influences it, but is not present in the output of `--help-env`. Here's a list of environment variables that are present in [the documentation](https://docs.python.org/3.14/using/cmdline.html#environment-variables) but missing from `--help-env` in `initconfig.c`: - `PYTHONASYNCIODEBUG` - `PYTHONDUMPREFS` - `PYTHONDUMPREFSFILE` - `PYTHONEXECUTABLE` - `PYTHONLEGACYWINDOWSFSENCODING` - `PYTHONLEGACYWINDOWSSTDIO` - `PYTHONMALLOCSTATS` - `PYTHONUSERBASE` - `PYTHON_BASIC_REPL` - `PYTHON_PERF_JIT_SUPPORT` The environment variable `PYTHONSTATS` is present in `initconfig.c` but missing from the docs. Here's the part of `initconfig.c` with the content of `--help-env`: https://github.com/python/cpython/blob/d25954dff5409c8926d2a4053d3e892462f8b8b5/Python/initconfig.c#L234-L301 I did a search to figure out if these are intentionally missing, but wasn't able to find out. <!-- gh-linked-prs --> ### Linked PRs * gh-120006 <!-- /gh-linked-prs -->