Ethan Welty added the comment:
@ronaldoussoren: The order of the imports made no difference. Even with the
call at the top, I got endless errors with both 'spawn' and 'forkserver', with
or without importing a graphics backend. Only 'fork' works, and only if a
gr
Ethan Welty added the comment:
Terry Reedy: I just tried your suggestion of a main clause (code below) and it
made no difference.
```
import _tkinter
import numpy as np
# multiprocessing.set_start_method("spawn")
import multiprocessing
def parallel_matmul(x):
R = np.random.
Change by Ethan Welty :
--
components: +macOS
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Ethan Welty added the comment:
I've tried with additional backends: WX, WXAgg, WXCairo, Qt5Agg (in matplotlib
speak).
With these, I can at least import matplotlib.pyplot, but as soon as say
matplotlib.pyplot.plot is called and the backend is loaded, the code breaks
(error message for
Ethan Welty added the comment:
I have tried running the script with:
- command line (python ): Works without (breaks with) `import _tkinter`.
- basic python console (python): Same as with command line.
- ipython: Fails with or without `import _tkinter`. However, if for example I
make the
Change by Ethan Welty :
--
versions: -Python 3.8
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New submission from Ethan Welty :
Merely importing tkinter breaks the use of parallel code on my system (Mac OSX
10.11.6, tested on Python 2.7.13 / 2.7.14 / 3.5.0 / 3.6.4, all barebones
distributions installed with pyenv). I've tested this with both multiprocessing
and sharedmem (see mi
