带有matplotlib和tkinter的Kivy中的NSException [英] NSException in kivy with matplotlib and tkinter

问题描述

我继承了一些使用kivy/tkinter/matplotlib的代码，这些代码在Windows上可以正常运行，但在osx上存在一些问题.一个问题已经另一个问题已解决 .运行以下命令时得到NSException:

I have inherited some code thats using kivy/tkinter/matplotlib which run fine on windows but has some problems on osx. One problem was solved already in another question. I'm getting an NSException when I run the following:

import tkinter
# tkinter._test()

import matplotlib
matplotlib.use("TkAgg")
from matplotlib import pyplot as plt
import kivy.core.window

from tkinter.filedialog import askopenfilename

askopenfilename(initialdir='/', title="Open files")

除非我打电话给askopenfilename，否则我不会得到例外. 现在我在想也许tkinter无法正常工作"，所以我放入了最初的tkinter._test()，然后它说一切正常……而当代码继续执行时，则不会发生异常，并且一切正常.

I don't get the exception unless I call askopenfilename. Now I was thinking "maybe tkinter isn't working" so I threw in the initial tkinter._test(), which then says everything is ok... and when the code afterwards continues the exception doesn't occur and everything runs just fine.

所以我的问题是，这些NSExceptions的根源和本质通常是什么，tkinter._test()会做什么而导致它不发生?

So my question is, what is typically the root and nature of these NSExceptions, and what could tkinter._test() be doing that causes it not to occur?

以及如何在没有不必要的初始测试弹出窗口的情况下复制其操作?

And how to I replicate what it's doing without having the unwanted initial test popup?

抛出的异常是:

2017-03-08 15:16:00.199 Python[31489:260345] -[SDLApplication _setup:]: unrecognized selector sent to instance 0x1021727f0
2017-03-08 15:16:00.203 Python[31489:260345] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[SDLApplication _setup:]: unrecognized selector sent to instance 0x1021727f0'
*** First throw call stack:
(
    0   CoreFoundation                      0x00007fffa8716e7b __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x00007fffbd300cad objc_exception_throw + 48
    ...
    53  Python                              0x0000000100000c34 Python + 3124
)
libc++abi.dylib: terminating with uncaught exception of type NSException

推荐答案

所以我觉得很愚蠢，原因仅仅是_test()创建了一个根窗口，而解决方案只是在导入后创建一个根窗口:

So I feel silly, the reason was simply that _test() creates a root window, and the grand solution is just to create a root window after importing:

import tkinter
root = tkinter.Tk()
root.withdraw()

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