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Fix mutable default arguments in backend_svg.py #31141

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Merged
anntzer merged 1 commit into from
Feb 13, 2026
Merged

Fix mutable default arguments in backend_svg.py #31141

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8 changes: 6 additions & 2 deletions lib/matplotlib/backends/backend_svg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -133,7 +133,7 @@ def __flush(self, indent=True):
self.__write(_escape_cdata(data))
self.__data = []

def start(self, tag, attrib={}, **extra):
def start(self, tag, attrib=None, **extra):
"""
Open a new element. Attributes can be given as keyword
arguments, or as a string/string dictionary. The method returns
Expand All @@ -152,6 +152,8 @@ def start(self, tag, attrib={}, **extra):
-------
An element identifier.
"""
if attrib is None:
attrib = {}
self.__flush()
tag = _escape_cdata(tag)
self.__data = []
Expand Down Expand Up @@ -232,12 +234,14 @@ def close(self, id):
while len(self.__tags) > id:
self.end()

def element(self, tag, text=None, attrib={}, **extra):
def element(self, tag, text=None, attrib=None, **extra):
"""
Add an entire element. This is the same as calling :meth:`start`,
:meth:`data`, and :meth:`end` in sequence. The *text* argument can be
omitted.
"""
if attrib is None:
attrib = {}
self.start(tag, attrib, **extra)
if text:
self.data(text)
Expand Down
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