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Private helper to get requested backend without triggering resolution. #23263

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Merged
merged 1 commit into from
Jun 13, 2022
Merged

Private helper to get requested backend without triggering resolution. #23263

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10 changes: 7 additions & 3 deletions lib/matplotlib/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -678,6 +678,11 @@ def __getitem__(self, key):

return dict.__getitem__(self, key)

def _get_backend_or_none(self):
"""Get the requested backend, if any, without triggering resolution."""
backend = dict.__getitem__(self, "backend")
return None if backend is rcsetup._auto_backend_sentinel else backend

def __repr__(self):
class_name = self.__class__.__name__
indent = len(class_name) + 1
Expand Down Expand Up @@ -1129,9 +1134,8 @@ def use(backend, *, force=True):
matplotlib.get_backend
"""
name = validate_backend(backend)
# we need to use the base-class method here to avoid (prematurely)
# resolving the "auto" backend setting
if dict.__getitem__(rcParams, 'backend') == name:
# don't (prematurely) resolve the "auto" backend setting
if rcParams._get_backend_or_none() == name:
# Nothing to do if the requested backend is already set
pass
else:
Expand Down
9 changes: 2 additions & 7 deletions lib/matplotlib/backends/qt_compat.py
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Expand Up @@ -55,15 +55,10 @@
QT_API = QT_API_PYSIDE2
# Otherwise, check the QT_API environment variable (from Enthought). This can
# only override the binding, not the backend (in other words, we check that the
# requested backend actually matches). Use dict.__getitem__ to avoid
# requested backend actually matches). Use _get_backend_or_none to avoid
# triggering backend resolution (which can result in a partially but
# incompletely imported backend_qt5).
elif (
isinstance(dict.__getitem__(mpl.rcParams, "backend"), str) and
dict.__getitem__(mpl.rcParams, "backend").lower() in [
"qt5agg", "qt5cairo"
]
):
elif (mpl.rcParams._get_backend_or_none() or "").lower().startswith("qt5"):
if QT_API_ENV in ["pyqt5", "pyside2"]:
QT_API = _ETS[QT_API_ENV]
else:
Expand Down
2 changes: 1 addition & 1 deletion lib/matplotlib/pyplot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2195,7 +2195,7 @@ def polar(*args, **kwargs):
# requested, ignore rcParams['backend'] and force selection of a backend that
# is compatible with the current running interactive framework.
if (rcParams["backend_fallback"]
and dict.__getitem__(rcParams, "backend") in (
and rcParams._get_backend_or_none() in (
set(_interactive_bk) - {'WebAgg', 'nbAgg'})
and cbook._get_running_interactive_framework()):
dict.__setitem__(rcParams, "backend", rcsetup._auto_backend_sentinel)
Expand Down