ImportError: Matplotlib qt-based backends require an external PyQt4, PyQt5
>>>importmatplotlib.pyplotasplt当运行上面的简单import语句时,出现了下面的错误:Traceback(mostrecentcalllast):File"",line1,inFile"/usr/local/lib/python2.7/dist-packages/matplotlib/pyplot.py",line115,in_backend_mod,new_figu