Mac PyCharm CE python matplotlib plt.show() 报错
在 PyCharm 中测试线性回归算法时，调用 plt.show() 时，
编译通过，运行报错。
2019-01-20 11:32:41.235 python[43029:5007789] -[NSApplication _setup:]: unrecognized selector sent to instance 0x7fe34e5ed2f0
2019-01-20 11:32:41.237 python[43029:5007789] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSApplication _setup:]: unrecognized selector sent to instance 0x7fe34e5ed2f0'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff3226ce65 __exceptionPreprocess + 256
1 libobjc.A.dylib 0x00007fff5e2c7720 objc_exception_throw + 48
2 CoreFoundation 0x00007fff322ea22d -[NSObject(NSObject) __retain_OA] + 0
3 CoreFoundation 0x00007fff3220e820 ___forwarding___ + 1486
4 CoreFoundation 0x00007fff3220e1c8 _CF_forwarding_prep_0 + 120
5 libtk8.6.dylib 0x00000001156eb31d TkpInit + 413
6 libtk8.6.dylib 0x000000011564317e Initialize + 2622
7 _tkinter.cpython-36m-darwin.so 0x000000011546ba16 _tkinter_create + 1174
8 python 0x0000000101253068 _PyCFunction_FastCallDict + 200
9 python 0x000000010132861f call_function + 143
10 python 0x0000000101326175 _PyEval_EvalFrameDefault + 46837
11 python 0x00000001013198c9 _PyEval_EvalCodeWithName + 425
12 python 0x00000001013292cc _PyFunction_FastCallDict + 364
13 python 0x00000001011d1f80 _PyObject_FastCallDict + 320
14 python 0x00000001011f95f8 method_call + 136
15 python 0x00000001011d95ce PyObject_Call + 62
16 python 0x000000010127a5b5 slot_tp_init + 117
17 python 0x000000010127eaf1 type_call + 241
18 python 0x00000001011d1ef1 _PyObject_FastCallDict + 177
19 python 0x00000001011da137 _PyObject_FastCallKeywords + 327
20 python 0x0000000101328718 call_function + 392
21 python 0x0000000101326225 _PyEval_EvalFrameDefault + 47013
22 python 0x00000001013289dc fast_function + 188
23 python 0x000000010132867c call_function + 236
24 python 0x0000000101326175 _PyEval_EvalFrameDefault + 46837
25 python 0x00000001013198c9 _PyEval_EvalCodeWithName + 425
26 python 0x00000001013292cc _PyFunction_FastCallDict + 364
27 python 0x00000001011d1f80 _PyObject_FastCallDict + 320
28 python 0x00000001011f95f8 method_call + 136
29 python 0x00000001011d95ce PyObject_Call + 62
30 python 0x0000000101326376 _PyEval_EvalFrameDefault + 47350
31 python 0x00000001013198c9 _PyEval_EvalCodeWithName + 425
32 python 0x0000000101328a8a fast_function + 362
33 python 0x000000010132867c call_function + 236
34 python 0x0000000101326175 _PyEval_EvalFrameDefault + 46837
35 python 0x00000001013289dc fast_function + 188
36 python 0x000000010132867c call_function + 236
37 python 0x0000000101326175 _PyEval_EvalFrameDefault + 46837
38 python 0x00000001013198c9 _PyEval_EvalCodeWithName + 425
39 python 0x0000000101328a8a fast_function + 362
40 python 0x000000010132867c call_function + 236
41 python 0x0000000101326175 _PyEval_EvalFrameDefault + 46837
42 python 0x00000001013198c9 _PyEval_EvalCodeWithName + 425
43 python 0x0000000101328a8a fast_function + 362
44 python 0x000000010132867c call_function + 236
45 python 0x0000000101326175 _PyEval_EvalFrameDefault + 46837
46 python 0x00000001013198c9 _PyEval_EvalCodeWithName + 425
47 python 0x000000010137255c PyRun_FileExFlags + 252
48 python 0x0000000101371a34 PyRun_SimpleFileExFlags + 372
49 python 0x00000001013987c6 Py_Main + 3734
50 python 0x00000001011c9f59 main + 313
51 libdyld.dylib 0x00007fff5f39608d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
原因： backend 设置不正确。
解决：
- 找到 matplotlib 配置文件 matplotlibrc
- 修改 backend
## non-interactive backend.
backend : TkAgg
修改后可正常调用 plt.show()