Precompile the first calls of a JuliaCall session

CHANGELOG.md

@@ -1,6 +1,8 @@
 # Changelog
 
 ## Unreleased
+* The first call from Python in a new JuliaCall session no longer compiles
+  `jl.<name>` lookup on a module or `jl.seval`, saving about a second.
 * Bug fixes.
 
 ## 0.9.36 (2026-09-18)

src/JlWrap/any.jl

@@ -21,6 +21,8 @@ function pyjlany_getattr(self, k_::Py)
     Py(getproperty(self, k))
 end
 pyjl_handle_error_type(::typeof(pyjlany_getattr), self, exc) = pybuiltins.AttributeError
+# `jl.<name>` on `juliacall.Main` is often the first call of a JuliaCall session.
+precompile(pyjlany_getattr, (Module, Py))
 
 function pyjlany_setattr(self, k_::Py, v_::Py)
     k = Symbol(pyjl_attr_py2jl(pyconvert(String, k_)))

src/JlWrap/module.jl

@@ -12,6 +12,8 @@ end
 function pyjlmodule_seval(self::Module, expr::Py)
     Py(Base.eval(self, Meta.parseall(strip(pyconvert(String, expr)))))
 end
+# `jl.seval(...)` is often the first call of a JuliaCall session.
+precompile(pyjlmodule_seval, (Module, Py))
 
 function init_module()
     jl = pyjuliacallmodule