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ENH: by-pass creating a local class if backend has a Backend class #22380

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ENH: by-pass creating a local class if backend has a Backend class #22380

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3 changes: 3 additions & 0 deletions lib/matplotlib/backend_bases.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3523,6 +3523,9 @@ class Show(ShowBase):
def mainloop(self):
return cls.mainloop()

if not hasattr(sys.modules[cls.__module__], "Backend"):
setattr(sys.modules[cls.__module__], "Backend", cls)

setattr(sys.modules[cls.__module__], "Show", Show)
return cls

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12 changes: 10 additions & 2 deletions lib/matplotlib/pyplot.py
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Expand Up @@ -269,8 +269,16 @@ def switch_backend(newbackend):

backend_name = cbook._backend_module_name(newbackend)

class backend_mod(matplotlib.backend_bases._Backend):
locals().update(vars(importlib.import_module(backend_name)))
backend_mod = importlib.import_module(backend_name)
if hasattr(backend_mod, "Backend"):
backend_mod = backend_mod.Backend
else:
class backend_mod(matplotlib.backend_bases._Backend):
locals().update(vars(backend_mod))

@classmethod
def mainloop(cls):
return backend_mod.Show().mainloop()

required_framework = _get_required_interactive_framework(backend_mod)
if required_framework is not None:
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