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Backport PR #30394 on branch v3.10.x (ENH: Gracefully handle python-build-standalone ImportError with Tk) #30481

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Merged
ksunden merged 1 commit into from
Aug 29, 2025
Merged

Backport PR #30394 on branch v3.10.x (ENH: Gracefully handle python-build-standalone ImportError with Tk) #30481

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32 changes: 30 additions & 2 deletions lib/matplotlib/backends/_backend_tk.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,36 @@
TimerBase, ToolContainerBase, cursors, _Mode, MouseButton,
CloseEvent, KeyEvent, LocationEvent, MouseEvent, ResizeEvent)
from matplotlib._pylab_helpers import Gcf
from . import _tkagg
from ._tkagg import TK_PHOTO_COMPOSITE_OVERLAY, TK_PHOTO_COMPOSITE_SET

try:
from . import _tkagg
from ._tkagg import TK_PHOTO_COMPOSITE_OVERLAY, TK_PHOTO_COMPOSITE_SET
except ImportError as e:
# catch incompatibility of python-build-standalone with Tk
cause1 = getattr(e, '__cause__', None)
cause2 = getattr(cause1, '__cause__', None)
if (isinstance(cause1, ImportError) and
isinstance(cause2, AttributeError) and
"'_tkinter' has no attribute '__file__'" in str(cause2)):

is_uv_python = "/uv/python" in (os.path.realpath(sys.executable))
if is_uv_python:
raise ImportError(
"Failed to import tkagg backend. You appear to be using an outdated "
"version of uv's managed Python distribution which is not compatible "
"with Tk. Please upgrade to the latest uv version, then update "
"Python with: `uv python upgrade --reinstall`"
) from e
else:
raise ImportError(
"Failed to import tkagg backend. This is likely caused by using a "
"Python executable based on python-build-standalone, which is not "
"compatible with Tk. Recent versions of python-build-standalone "
"should be compatible with Tk. Please update your python version "
"or select another backend."
) from e
else:
raise


_log = logging.getLogger(__name__)
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