Python报错：PermissionError: [Errno 13] Permission denied

一、问题现象：执行ITS脚本，有的正常有的出问题。出问题的提示

with open(CACHE_FILENAME, "w") as f:
IOError: [Errno 13] Permission denied: 'its.target.cfg'

filename_or_obj = open(filename_or_obj, 'wb')
IOError: [Errno 13] Permission denied: 'test_dng_noise_model_plot.png'

test@test:/usr/local/android-cts-verifier/CameraITS$ python tests/scene1_2/test_yuv_jpeg_all.py camera=0
Measuring target exposure
Running vendor 3A on device
Capturing 1 frame with 1 format [yuv]
Setting cached target exposure
Traceback (most recent call last):File "tests/scene1_2/test_yuv_jpeg_all.py", line 102, in <module>main()File "tests/scene1_2/test_yuv_jpeg_all.py", line 42, in maine, s = its.target.get_target_exposure_combos(cam)["midExposureTime"]File "/usr/local/android-cts-verifier/CameraITS/pymodules/its/target.py", line 196, in get_target_exposure_combosexposure = get_target_exposure(its_session)File "/usr/local/android-cts-verifier/CameraITS/pymodules/its/target.py", line 164, in get_target_exposure__set_cached_target_exposure(measured_exposure)File "/usr/local/android-cts-verifier/CameraITS/pymodules/its/target.py", line 100, in __set_cached_target_exposurewith open(CACHE_FILENAME, "w") as f:
IOError: [Errno 13] Permission denied: 'its.target.cfg'

test@test:/usr/local/android-cts-verifier/CameraITS$ python tests/scene1_1/test_dng_noise_model.py camera=0
Running vendor 3A on device
Capturing 1 frame with 1 format [raw]
部分略Traceback (most recent call last):File "tests/scene1_1/test_dng_noise_model.py", line 151, in <module>main()File "tests/scene1_1/test_dng_noise_model.py", line 139, in mainmatplotlib.pyplot.savefig('%s_plot.png' % NAME)File "/usr/lib/python2.7/dist-packages/matplotlib/pyplot.py", line 701, in savefigres = fig.savefig(*args, **kwargs)File "/usr/lib/python2.7/dist-packages/matplotlib/figure.py", line 1834, in savefigself.canvas.print_figure(fname, **kwargs)File "/usr/lib/python2.7/dist-packages/matplotlib/backend_bases.py", line 2267, in print_figure**kwargs)File "/usr/lib/python2.7/dist-packages/matplotlib/backends/backend_agg.py", line 512, in print_pngfilename_or_obj = open(filename_or_obj, 'wb')
IOError: [Errno 13] Permission denied: 'test_dng_noise_model_plot.png'

有的也正常

test@test:/usr/local/android-cts-verifier/CameraITS$ python tests/scene1_1/test_3a.py camera=0
Running vendor 3A on device
AE: sensitivity 870, exposure 19ms
AWB: gains [1.121094, 1.0, 1.0, 2.546875] transform [1.753906, -0.773438, 0.017578, -0.416016, 1.533203, -0.117188, -0.310547, -0.853516, 2.164063]
AF: distance 5.468337

这块的问题是ubuntu19环境有问题，换上ubuntu18就可以。

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