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Don't force matplotlib backend names to be lowercase (#14475)...
Don't force matplotlib backend names to be lowercase (#14475) This is something I missed as part of moving the backend resolution to Matplotlib. Since version 3.9.0 Matplotlib handles the case-sensitivity of backend names, making them all lowercase for internal use. But since matplotlib/matplotlib#28473 uppercase letters are allowed in backend names of the form `module://soMe_moDule.sOmE_NAme`. Hence we need to not force backend names to be lowercase in IPython when passing them to Matplotlib. It is just a one line change that happens to make the code simpler, plus a new test. The Matplotlib change will be released in 3.9.1 which is due shortly, possibly today. The new test checks the Matplotlib version to know whether uppercase backend module names are allowed or not.
Fernando Perez - - Load All Authors

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test_combo.txt
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=======================
Combo testing example
=======================
This is a simple example that mixes ipython doctests::
In [1]: import code
In [2]: 2**12
Out[2]: 4096
with command-line example information that does *not* get executed::
$ mpirun -n 4 ipengine --controller-port=10000 --controller-ip=host0
and with literal examples of Python source code::
controller = dict(host='myhost',
engine_port=None, # default is 10105
control_port=None,
)
# keys are hostnames, values are the number of engine on that host
engines = dict(node1=2,
node2=2,
node3=2,
node3=2,
)
# Force failure to detect that this test is being run.
1/0
These source code examples are executed but no output is compared at all. An
error or failure is reported only if an exception is raised.
NOTE: the execution of pure python blocks is not yet working!