Saurabh
Reputation: 6920
Error While Showing Matplotlib Figure in Flask
I'm taking two inputs from a flask endpoint. The first value is a string type and the other is also a string which I'm converting to an int type.
When I pass these values from the flask script, to another script which produces a pie-chart using matplotlib.pyplot, I get an error:
analyzer.py:114: UserWarning: Starting a Matplotlib GUI outside of the main thread will likely fail.
patches, texts = plt.pie(sizes, colors=colors, startangle=90)
2020-11-29 20:02:23.430 Python[48923:2857853] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'NSWindow drag regions should only be invalidated on the Main Thread!'
However, when I run the piechart producing script (analyzer.py) directly, I'm able to see the expected output, and the figure is also produced in the specified directory.
Below is the function which is causing the issue:
def plotPieChart(self, positive, wpositive, spositive, negative,
wnegative, snegative, neutral, searchTerm, noOfSearchTerms):
labels = ['positive [' + str(positive) + '%]', 'Weakly positive ['
+ str(wpositive) + '%]','Strongly positive [' + str(spositive)
+ '%]', 'Neutral [' + str(neutral) + '%]', 'Negative ['
+ str(negative) + '%]', 'Weakly Negative [' + str(wnegative)
+ '%]', 'Strongly Negative [' + str(snegative) + '%]']
sizes = [positive, wpositive, spositive, neutral, negative, wnegative, snegative]
colors = ['yellowgreen','lightgreen','darkgreen', 'gold', 'red','lightsalmon','darkred']
patches, texts = plt.pie(sizes, colors=colors, startangle=90)
plt.legend(patches, labels, loc="best")
plt.title('How people are reacting on ' + searchTerm + ' by analyzing '
+ str(noOfSearchTerms) + ' Tweets.')
plt.axis('equal')
plt.tight_layout()
# plt.show()
plt.savefig('app/static/images/piechart.png')
Complete stdout stack trace:
analyzer.py:114: UserWarning: Starting a Matplotlib GUI outside of the main thread will likely fail.
patches, texts = plt.pie(sizes, colors=colors, startangle=90)
2020-11-29 20:02:23.430 Python[48923:2857853] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'NSWindow drag regions should only be invalidated on the Main Thread!'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff30458b57 __exceptionPreprocess + 250
1 libobjc.A.dylib 0x00007fff692a45bf objc_exception_throw + 48
2 CoreFoundation 0x00007fff3048134c -[NSException raise] + 9
3 AppKit 0x00007fff2d67b5ec -[NSWindow(NSWindow_Theme) _postWindowNeedsToResetDragMarginsUnlessPostingDisabled] + 310
4 AppKit 0x00007fff2d663052 -[NSWindow _initContent:styleMask:backing:defer:contentView:] + 1416
5 AppKit 0x00007fff2d662ac3 -[NSWindow initWithContentRect:styleMask:backing:defer:] + 42
6 _macosx.cpython-39-darwin.so 0x000000010b17d8a5 -[Window initWithContentRect:styleMask:backing:defer:withManager:] + 69
7 _macosx.cpython-39-darwin.so 0x000000010b1813fd FigureManager_init + 269
8 Python 0x00000001002ababa wrap_init + 12
9 Python 0x0000000100269732 wrapperdescr_call + 316
10 Python 0x0000000100262b47 _PyObject_MakeTpCall + 266
11 Python 0x000000010030abd7 call_function + 455
12 Python 0x0000000100307d34 _PyEval_EvalFrameDefault + 27452
13 Python 0x00000001002631ec function_code_fastcall + 97
14 Python 0x0000000100262a0b _PyObject_FastCallDictTstate + 212
15 Python 0x0000000100263435 _PyObject_Call_Prepend + 139
16 Python 0x00000001002aba1e slot_tp_init + 87
17 Python 0x00000001002a521b type_call + 150
18 Python 0x0000000100262b47 _PyObject_MakeTpCall + 266
19 Python 0x000000010030abd7 call_function + 455
20 Python 0x0000000100307d34 _PyEval_EvalFrameDefault + 27452
21 Python 0x00000001002631ec function_code_fastcall + 97
22 Python 0x0000000100264e4f method_vectorcall + 164
23 Python 0x000000010030aba3 call_function + 403
24 Python 0x0000000100307d34 _PyEval_EvalFrameDefault + 27452
25 Python 0x000000010030b6eb _PyEval_EvalCode + 1998
26 Python 0x000000010026317c _PyFunction_Vectorcall + 248
27 Python 0x0000000100264e4f method_vectorcall + 164
28 Python 0x0000000100262ec3 PyVectorcall_Call + 146
29 Python 0x0000000100308064 _PyEval_EvalFrameDefault + 28268
30 Python 0x000000010030b6eb _PyEval_EvalCode + 1998
31 Python 0x000000010026317c _PyFunction_Vectorcall + 248
32 Python 0x0000000100262ec3 PyVectorcall_Call + 146
33 Python 0x0000000100308064 _PyEval_EvalFrameDefault + 28268
34 Python 0x000000010030b6eb _PyEval_EvalCode + 1998
35 Python 0x000000010026317c _PyFunction_Vectorcall + 248
36 Python 0x000000010030aba3 call_function + 403
37 Python 0x0000000100307de0 _PyEval_EvalFrameDefault + 27624
38 Python 0x00000001002631ec function_code_fastcall + 97
39 Python 0x000000010030aba3 call_function + 403
40 Python 0x0000000100307de0 _PyEval_EvalFrameDefault + 27624
41 Python 0x000000010030b6eb _PyEval_EvalCode + 1998
42 Python 0x000000010026317c _PyFunction_Vectorcall + 248
43 Python 0x000000010030aba3 call_function + 403
44 Python 0x0000000100307de0 _PyEval_EvalFrameDefault + 27624
45 Python 0x000000010030b6eb _PyEval_EvalCode + 1998
46 Python 0x000000010026317c _PyFunction_Vectorcall + 248
47 Python 0x000000010030aba3 call_function + 403
48 Python 0x0000000100307e9e _PyEval_EvalFrameDefault + 27814
49 Python 0x00000001002631ec function_code_fastcall + 97
50 Python 0x000000010030aba3 call_function + 403
51 Python 0x0000000100307d18 _PyEval_EvalFrameDefault + 27424
52 Python 0x00000001002631ec function_code_fastcall + 97
53 Python 0x000000010030aba3 call_function + 403
54 Python 0x0000000100307d18 _PyEval_EvalFrameDefault + 27424
55 Python 0x00000001002631ec function_code_fastcall + 97
56 Python 0x0000000100308064 _PyEval_EvalFrameDefault + 28268
57 Python 0x00000001002631ec function_code_fastcall + 97
58 Python 0x000000010030aba3 call_function + 403
59 Python 0x0000000100307d18 _PyEval_EvalFrameDefault + 27424
60 Python 0x00000001002631ec function_code_fastcall + 97
61 Python 0x000000010030aba3 call_function + 403
62 Python 0x0000000100307d18 _PyEval_EvalFrameDefault + 27424
63 Python 0x00000001002631ec function_code_fastcall + 97
64 Python 0x000000010030aba3 call_function + 403
65 Python 0x0000000100307d18 _PyEval_EvalFrameDefault + 27424
66 Python 0x00000001002631ec function_code_fastcall + 97
67 Python 0x0000000100262a0b _PyObject_FastCallDictTstate + 212
68 Python 0x0000000100263435 _PyObject_Call_Prepend + 139
69 Python 0x00000001002aae83 slot_tp_call + 87
70 Python 0x0000000100262b47 _PyObject_MakeTpCall + 266
71 Python 0x000000010030abd7 call_function + 455
72 Python 0x0000000100307d34 _PyEval_EvalFrameDefault + 27452
73 Python 0x00000001002631ec function_code_fastcall + 97
74 Python 0x0000000100262a0b _PyObject_FastCallDictTstate + 212
75 Python 0x0000000100263435 _PyObject_Call_Prepend + 139
76 Python 0x00000001002aae83 slot_tp_call + 87
77 Python 0x0000000100262b47 _PyObject_MakeTpCall + 266
78 Python 0x000000010030abd7 call_function + 455
79 Python 0x0000000100307d34 _PyEval_EvalFrameDefault + 27452
80 Python 0x00000001002710c5 gen_send_ex + 269
81 Python 0x0000000100307629 _PyEval_EvalFrameDefault + 25649
82 Python 0x000000010030b6eb _PyEval_EvalCode + 1998
83 Python 0x000000010026317c _PyFunction_Vectorcall + 248
84 Python 0x000000010030aba3 call_function + 403
85 Python 0x0000000100307de0 _PyEval_EvalFrameDefault + 27624
86 Python 0x000000010030b6eb _PyEval_EvalCode + 1998
87 Python 0x000000010026317c _PyFunction_Vectorcall + 248
88 Python 0x000000010030aba3 call_function + 403
89 Python 0x0000000100307d18 _PyEval_EvalFrameDefault + 27424
90 Python 0x00000001002631ec function_code_fastcall + 97
91 Python 0x000000010030aba3 call_function + 403
92 Python 0x0000000100307d18 _PyEval_EvalFrameDefault + 27424
93 Python 0x00000001002631ec function_code_fastcall + 97
94 Python 0x000000010030aba3 call_function + 403
95 Python 0x0000000100307d34 _PyEval_EvalFrameDefault + 27452
96 Python 0x00000001002631ec function_code_fastcall + 97
97 Python 0x000000010030aba3 call_function + 403
98 Python 0x0000000100307d18 _PyEval_EvalFrameDefault + 27424
99 Python 0x00000001002631ec function_code_fastcall + 97
100 Python 0x0000000100262a0b _PyObject_FastCallDictTstate + 212
101 Python 0x0000000100263435 _PyObject_Call_Prepend + 139
102 Python 0x00000001002aba1e slot_tp_init + 87
103 Python 0x00000001002a521b type_call + 150
104 Python 0x0000000100262b47 _PyObject_MakeTpCall + 266
105 Python 0x000000010030abd7 call_function + 455
106 Python 0x0000000100307d34 _PyEval_EvalFrameDefault + 27452
107 Python 0x00000001002631ec function_code_fastcall + 97
108 Python 0x000000010030aba3 call_function + 403
109 Python 0x0000000100307d18 _PyEval_EvalFrameDefault + 27424
110 Python 0x00000001002631ec function_code_fastcall + 97
111 Python 0x0000000100264f52 method_vectorcall + 423
112 Python 0x0000000100308064 _PyEval_EvalFrameDefault + 28268
113 Python 0x00000001002631ec function_code_fastcall + 97
114 Python 0x000000010030aba3 call_function + 403
115 Python 0x0000000100307d18 _PyEval_EvalFrameDefault + 27424
116 Python 0x00000001002631ec function_code_fastcall + 97
117 Python 0x000000010030aba3 call_function + 403
118 Python 0x0000000100307d18 _PyEval_EvalFrameDefault + 27424
119 Python 0x00000001002631ec function_code_fastcall + 97
120 Python 0x0000000100264edb method_vectorcall + 304
121 Python 0x000000010038514f t_bootstrap + 70
122 Python 0x0000000100344ff1 pythread_wrapper + 25
123 libsystem_pthread.dylib 0x00007fff6a651109 _pthread_start + 148
124 libsystem_pthread.dylib 0x00007fff6a64cb8b thread_start + 15
)
libc++abi.dylib: terminating with uncaught exception of type NSException
I've followed this answer to use the output of matplotlib in flask.
Please let me know how I can get around this issue?
Upvotes: 2
Views: 3366
Answers (1)
Saurabh
Reputation: 6920
I solved this by using the Agg back-end, which is non-GUI:
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
Upvotes: 11
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