Matplotlib Crashing tkinter Application
I am building an application that embeds a matplotlib figure into the GUI. The problem is that my app is crashing as soon as I add anything from matplotlib into my code (except for the imports, those work as usual). The problem occurs in my class Solver_App at tk.Tk.__init__(self, *args, **kwargs). When I run the code, I get a massive error and the app crashes. Here is some of my code:
import tkinter as tk
from tkinter import ttk
import matplotlib
from matplotlib import pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg
from matplotlib.figure import Figure
# Setting up figures for integration in GUI:
fig_3D = plt.figure()
fig_2D = plt.figure()
a_3D = fig_3D.add_subplot(111, projection="3d")
a_2D = fig_2D.add_subplot(111)
a_3D.plot_wireframe([1, 2, 3, 4, 5], [1, 3, 7, 6, 4], [1, 2, 3, 4, 5], color="blue")
class Solver_App(tk.Tk, ttk.Frame):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs) # This is where the app crashes.
# Equation frame holds everything related to the input and configuration of the equations.
equation_frame = ttk.Frame(self)
equation_frame.pack(side="bottom", fill="x", pady=50, padx=50)
# More code goes here...
# There are more classes with a similar setup as the one above...
app = Solver_App()
app.mainloop()
And here is the massive error I get when running the code:
2015-08-14 15:18:29.142 Python[50796:18837594] -[NSApplication _setup:]: unrecognized selector sent to instance 0x10216a830
2015-08-14 15:18:29.143 Python[50796:18837594] An uncaught exception was raised
2015-08-14 15:18:29.143 Python[50796:18837594] -[NSApplication _setup:]: unrecognized selector sent to instance 0x10216a830
2015-08-14 15:18:29.144 Python[50796:18837594] (
0 CoreFoundation 0x00007fff9901b03c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff9436476e objc_exception_throw + 43
2 CoreFoundation 0x00007fff9901e0ad -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x00007fff98f63e24 ___forwarding___ + 1028
4 CoreFoundation 0x00007fff98f63998 _CF_forwarding_prep_0 + 120
5 Tk 0x00000001024ad527 TkpInit + 476
6 Tk 0x0000000102427aca Tk_Init + 1788
7 _tkinter.so 0x00000001006e5f2d Tcl_AppInit + 77
8 _tkinter.so 0x00000001006e30d6 Tkinter_Create + 934
9 Python 0x00000001000e44ce PyEval_EvalFrameEx + 28894
10 Python 0x00000001000e5ced PyEval_EvalCodeEx + 2349
11 Python 0x000000010003e8ba function_call + 186
12 Python 0x000000010000d3c8 PyObject_Call + 104
13 Python 0x00000001000e0cb9 PyEval_EvalFrameEx + 14537
14 Python 0x00000001000e5ced PyEval_EvalCodeEx + 2349
15 Python 0x000000010003e8ba function_call + 186
16 Python 0x000000010000d3c8 PyObject_Call + 104
17 Python 0x000000010002802c method_call + 140
18 Python 0x000000010000d3c8 PyObject_Call + 104
19 Python 0x000000010007b831 slot_tp_init + 81
20 Python 0x0000000100072d14 type_call + 212
21 Python 0x000000010000d3c8 PyObject_Call + 104
22 Python 0x00000001000e1b09 PyEval_EvalFrameEx + 18201
23 Python 0x00000001000e5ced PyEval_EvalCodeEx + 2349
24 Python 0x00000001000e5daf PyEval_EvalCode + 63
25 Python 0x000000010011048e PyRun_FileExFlags + 206
26 Python 0x000000010011083d PyRun_SimpleFileExFlags + 717
27 Python 0x000000010012810e Py_Main + 3262
28 Python 0x0000000100000e32 Python + 3634
29 Python 0x0000000100000c84 Python + 3204
30 ??? 0x0000000000000002 0x0 + 2
)
2015-08-14 15:18:29.144 Python[50796:18837594] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSApplication _setup:]: unrecognized selector sent to instance 0x10216a830'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff9901b03c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff9436476e objc_exception_throw + 43
2 CoreFoundation 0x00007fff9901e0ad -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x00007fff98f63e24 ___forwarding___ + 1028
4 CoreFoundation 0x00007fff98f63998 _CF_forwarding_prep_0 + 120
5 Tk 0x00000001024ad527 TkpInit + 476
6 Tk 0x0000000102427aca Tk_Init + 1788
7 _tkinter.so 0x00000001006e5f2d Tcl_AppInit + 77
8 _tkinter.so 0x00000001006e30d6 Tkinter_Create + 934
9 Python 0x00000001000e44ce PyEval_EvalFrameEx + 28894
10 Python 0x00000001000e5ced PyEval_EvalCodeEx + 2349
11 Python 0x000000010003e8ba function_call + 186
12 Python 0x000000010000d3c8 PyObject_Call + 104
13 Python 0x00000001000e0cb9 PyEval_EvalFrameEx + 14537
14 Python 0x00000001000e5ced PyEval_EvalCodeEx + 2349
15 Python 0x000000010003e8ba function_call + 186
16 Python 0x000000010000d3c8 PyObject_Call + 104
17 Python 0x000000010002802c method_call + 140
18 Python 0x000000010000d3c8 PyObject_Call + 104
19 Python 0x000000010007b831 slot_tp_init + 81
20 Python 0x0000000100072d14 type_call + 212
21 Python 0x000000010000d3c8 PyObject_Call + 104
22 Python 0x00000001000e1b09 PyEval_EvalFrameEx + 18201
23 Python 0x00000001000e5ced PyEval_EvalCodeEx + 2349
24 Python 0x00000001000e5daf PyEval_EvalCode + 63
25 Python 0x000000010011048e PyRun_FileExFlags + 206
26 Python 0x000000010011083d PyRun_SimpleFileExFlags + 717
27 Python 0x000000010012810e Py_Main + 3262
28 Python 0x0000000100000e32 Python + 3634
29 Python 0x0000000100000c84 Python + 3204
30 ??? 0x0000000000000002 0x0 + 2
)
libc++abi.dylib: terminating with uncaught exception of type NSException
I have been referencing code from a tutorial [found here](http://pythonprogramming.net/how-to-embed-matplotlib-graph-tkinter-gui/"How to embed a Matplotlib graph to your Tkinter GUI"), but their example seems to work fine. What is causing this problem and how can it be fixed?
- I am using Python 3.4, matplotlib 1.4.3, and running Mac OS Yosemite.
Answer
You need to set the TkAgg backend explicitly. I could reproduce your bug. With the following code, the problem is resolved.
import matplotlib
matplotlib.use("TkAgg")
from matplotlib import pyplot as plt
Note that setting the TkAgg backend after importing pyplot does not work either; it crashes too. You need to set it before importing pyplot. (Tested with MPL 1.4.3, tkinter.TkVersion 8.6)