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Commit54ac172

Browse files
committed
Implement Path.__deepcopy__ avoiding infinite recursion
Give it a metaclass that lets us remove the __deepcopy__ methodfrom sight when executing that method.Closes#29157 without relying on private CPython methods.Does not fix the other issue with TransformNode.__copy__.
1 parentbebb263 commit54ac172

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2 files changed

+38
-5
lines changed

2 files changed

+38
-5
lines changed

‎lib/matplotlib/cbook.py

Lines changed: 25 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2437,3 +2437,28 @@ def _auto_format_str(fmt, value):
24372437
returnfmt% (value,)
24382438
except (TypeError,ValueError):
24392439
returnfmt.format(value)
2440+
2441+
2442+
class_HideDeepcopyMeta(type):
2443+
"""Metaclass that allows conditionally hiding the __deepcopy__ method.
2444+
2445+
Set __hide_deepcopy__ to True to hide the __deepcopy__ method,
2446+
which will then be looked up in the usual method resolution order.
2447+
"""
2448+
2449+
def__new__(cls,name,bases,namespace,**kwargs):
2450+
orig_ga=namespace.get("__getattribute__")orobject.__getattribute__
2451+
2452+
def__getattribute__(self,attr_name):
2453+
ifattr_name=="__deepcopy__"andorig_ga(self,"__hide_deepcopy__"):
2454+
forbaseintype(self).__mro__[1:]:
2455+
ifattr_nameinbase.__dict__:
2456+
method=base.__dict__[attr_name]
2457+
returnmethod.__get__(self,type(self))
2458+
raiseAttributeError(
2459+
f"'{type(self).__name__}' object has no attribute '{attr_name}'"
2460+
)
2461+
returnorig_ga(self,attr_name)
2462+
2463+
namespace["__getattribute__"]=__getattribute__
2464+
returnsuper().__new__(cls,name,bases,namespace)

‎lib/matplotlib/path.py

Lines changed: 13 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -16,12 +16,16 @@
1616
importnumpyasnp
1717

1818
importmatplotlibasmpl
19+
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from .import_api,_path
20-
from .cbookimport_to_unmasked_float_array,simple_linear_interpolation
21+
from .cbookimport (
22+
_to_unmasked_float_array,simple_linear_interpolation,_HideDeepcopyMeta
23+
)
2124
from .bezierimportBezierSegment
2225

2326

24-
classPath:
27+
28+
classPath(metaclass=_HideDeepcopyMeta):
2529
"""
2630
A series of possibly disconnected, possibly closed, line and curve
2731
segments.
@@ -281,9 +285,13 @@ def __deepcopy__(self, memo=None):
281285
readonly, even if the source `Path` is.
282286
"""
283287
# Deepcopying arrays (vertices, codes) strips the writeable=False flag.
284-
p=copy.deepcopy(super(),memo)
285-
p._readonly=False
286-
returnp
288+
self.__hide_deepcopy__=True
289+
try:
290+
p=copy.deepcopy(self,memo)
291+
p._readonly=False
292+
returnp
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finally:
294+
self.__hide_deepcopy__=False
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288296
deepcopy=__deepcopy__
289297

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