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Fix default backend #19854

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Fix default backend #19854

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01f4b57
MNT: make the source installed backend default and installed match
tacaswell Apr 2, 2021
7264112
FIX: ignore empty backend value in matplotlibrc
tacaswell Apr 2, 2021
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11 changes: 11 additions & 0 deletions lib/matplotlib/__init__.py
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Expand Up @@ -769,6 +769,17 @@ def _rc_params_in_file(fname, transform=lambda x: x, fail_on_error=False):

for key, (val, line, line_no) in rc_temp.items():
if key in rcsetup._validators:
# the backend parameter is special because the default value can
# not be expressed in the matplotlibrc file (the default is an
# internal sentinel to indicated that we should do backend fallback
# which picks the first importable interactive backend we find).
#
# This allows the backend parameter to be unset (as opposed to
# not present) in the matplotlibrc file. This is important because
# the defaults are pulled from a (fully commented out) template
# including with the installation.
if key == 'backend' and val == '':
continue
if fail_on_error:
config[key] = val # try to convert to proper type or raise
else:
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2 changes: 1 addition & 1 deletion lib/matplotlib/mpl-data/matplotlibrc
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Expand Up @@ -78,7 +78,7 @@
## PS PDF SVG Template
## You can also deploy your own backend outside of Matplotlib by referring to
## the module name (which must be in the PYTHONPATH) as 'module://my_backend'.
#backend: Agg
#backend:

## The port to use for the web server in the WebAgg backend.
#webagg.port: 8988
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