[rejected AI] Fix copying Template objects

CHANGES.rst

@@ -10,6 +10,7 @@ Unreleased
 -   Update minimum Babel version to >= 2.17.
 -   Deprecate the ``__version__`` attribute. Use feature detection or
     ``importlib.metadata.version("jinja2")`` instead.
+-   Support copying ``Template`` objects. :issue:`758`
 -   Use modern packaging metadata with ``pyproject.toml`` instead of ``setup.cfg``.
     :pr:`1793`
 -   Use ``flit_core`` instead of ``setuptools`` as build backend.

src/jinja2/environment.py

@@ -1210,6 +1210,12 @@ def __new__(
         )
         return env.from_string(source, template_class=cls)
 
+    def __copy__(self) -> "Template":
+        return self
+
+    def __deepcopy__(self, memo: dict[int, t.Any]) -> "Template":
+        return self
+
     @classmethod
     def from_code(
         cls,

tests/test_regression.py

@@ -1,3 +1,5 @@
+import copy
+
 import pytest
 
 from jinja2 import DictLoader
@@ -11,6 +13,13 @@
 
 
 class TestCorner:
+    def test_template_copy(self):
+        template = Template("Hello {{ name }}")
+
+        assert copy.copy(template) is template
+        assert copy.deepcopy(template) is template
+        assert template.render(name="world") == "Hello world"
+
     def test_assigned_scoping(self, env):
         t = env.from_string(
             """