import matplotlib; matplotlib.use('Qt5Agg'); matplotlib.rcParams['backend.qt5']='PySide2'
import matplotlib.pyplot as plt
fig, ax = plt.subplots()

    fig, ax = plt.subplots()
  File "<...>/lib/python3.6/site-packages/matplotlib/pyplot.py", line 1189, in subplots
    fig = figure(**fig_kw)
  File "<...>/lib/python3.6/site-packages/matplotlib/pyplot.py", line 544, in figure
    **kwargs)
  File "<...>/lib/python3.6/site-packages/matplotlib/backends/backend_qt5agg.py", line 44, in new_figure_manager
    return new_figure_manager_given_figure(num, thisFig)
  File "<...>/lib/python3.6/site-packages/matplotlib/backends/backend_qt5agg.py", line 51, in new_figure_manager_given_figure
    canvas = FigureCanvasQTAgg(figure)
  File "<...>/lib/python3.6/site-packages/matplotlib/backends/backend_qt5agg.py", line 246, in __init__
    super(FigureCanvasQTAgg, self).__init__(figure=figure)
  File "<...>/lib/python3.6/site-packages/matplotlib/backends/backend_qt5agg.py", line 68, in __init__
    super(FigureCanvasQTAggBase, self).__init__(figure=figure)
  File "<...>/lib/python3.6/site-packages/matplotlib/backends/backend_qt5.py", line 246, in __init__
    super(FigureCanvasQT, self).__init__(figure=figure)
AttributeError: 'figure()' is not a Qt property or a signal