remove support for python 3.14

Author: Christopher Doris

CondaPkg.toml

@@ -10,7 +10,7 @@ version = "<=julia"
 
 [deps.python]
 build = "**cpython**"
-version = ">=3.10,<4"
+version = ">=3.10,<3.14"
 
 [dev.deps]
 matplotlib = ""

docs/src/faq.md

@@ -1,5 +1,19 @@
 # FAQ & Troubleshooting
 
+## [Why is Python 3.14 not supported?](@id faq-python-314)
+
+Python has always had a mechanism for detecting recursion errors (stack overflows).
+The heuristics for this have been made stricter in Python 3.14, which means that any
+system which uses a non-standard stack and calls Python from it is likely to crash.
+Julia is such a system because each task has its own stack.
+
+There are discussions among Python developers about how to make the situation better but
+for now, PythonCall is highly likely to crash when using Python 3.14, so for the time
+being it is not supported.
+
+See the discussion and linked GitHub issue here:
+https://discuss.python.org/t/python-3-14-0-is-incompatible-with-stack-switching-systems-what-do-we-do/104880.
+
 ## [Can I use PythonCall and PyCall together?](@id faq-pycall)
 
 Yes, you can use both PyCall and PythonCall in the same Julia session. This is platform-dependent: