diff --git a/lib/matplotlib/backends/registry.py b/lib/matplotlib/backends/registry.py
index 47d5f65e350e..e08817bb089b 100644
--- a/lib/matplotlib/backends/registry.py
+++ b/lib/matplotlib/backends/registry.py
@@ -93,6 +93,9 @@ def __init__(self):
}
def _backend_module_name(self, backend):
+ if backend.startswith("module://"):
+ return backend[9:]
+
# Return name of module containing the specified backend.
# Does not check if the backend is valid, use is_valid_backend for that.
backend = backend.lower()
@@ -224,7 +227,8 @@ def is_valid_backend(self, backend):
bool
True if backend is valid, False otherwise.
"""
- backend = backend.lower()
+ if not backend.startswith("module://"):
+ backend = backend.lower()
# For backward compatibility, convert ipympl and matplotlib-inline long
# module:// names to their shortened forms.
@@ -342,7 +346,8 @@ def resolve_backend(self, backend):
The GUI framework, which will be None for a backend that is non-interactive.
"""
if isinstance(backend, str):
- backend = backend.lower()
+ if not backend.startswith("module://"):
+ backend = backend.lower()
else: # Might be _auto_backend_sentinel or None
# Use whatever is already running...
from matplotlib import get_backend
@@ -395,7 +400,8 @@ def resolve_gui_or_backend(self, gui_or_backend):
framework : str or None
The GUI framework, which will be None for a backend that is non-interactive.
"""
- gui_or_backend = gui_or_backend.lower()
+ if not gui_or_backend.startswith("module://"):
+ gui_or_backend = gui_or_backend.lower()
# First check if it is a gui loop name.
backend = self.backend_for_gui_framework(gui_or_backend)
diff --git a/lib/matplotlib/tests/test_backend_registry.py b/lib/matplotlib/tests/test_backend_registry.py
index 141ffd69c266..80c2ce4fc51a 100644
--- a/lib/matplotlib/tests/test_backend_registry.py
+++ b/lib/matplotlib/tests/test_backend_registry.py
@@ -86,6 +86,15 @@ def test_is_valid_backend(backend, is_valid):
assert backend_registry.is_valid_backend(backend) == is_valid
+@pytest.mark.parametrize("backend, normalized", [
+ ("agg", "matplotlib.backends.backend_agg"),
+ ("QtAgg", "matplotlib.backends.backend_qtagg"),
+ ("module://Anything", "Anything"),
+])
+def test_backend_normalization(backend, normalized):
+ assert backend_registry._backend_module_name(backend) == normalized
+
+
def test_deprecated_rcsetup_attributes():
match = "was deprecated in Matplotlib 3.9"
with pytest.warns(mpl.MatplotlibDeprecationWarning, match=match):
diff --git a/lib/matplotlib/tests/test_backend_template.py b/lib/matplotlib/tests/test_backend_template.py
index d7e2a5cd1266..964d15c1559a 100644
--- a/lib/matplotlib/tests/test_backend_template.py
+++ b/lib/matplotlib/tests/test_backend_template.py
@@ -49,3 +49,14 @@ def test_show_old_global_api(monkeypatch):
mpl.use("module://mpl_test_backend")
plt.show()
mock_show.assert_called_with()
+
+
+def test_load_case_sensitive(monkeypatch):
+ mpl_test_backend = SimpleNamespace(**vars(backend_template))
+ mock_show = MagicMock()
+ monkeypatch.setattr(
+ mpl_test_backend.FigureManagerTemplate, "pyplot_show", mock_show)
+ monkeypatch.setitem(sys.modules, "mpl_Test_Backend", mpl_test_backend)
+ mpl.use("module://mpl_Test_Backend")
+ plt.show()
+ mock_show.assert_called_with()
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