fromdatetimeimport*frommatplotlibimportpyplotasplty= [6,2,8,3,1,8,5,3,0,7]x= [date.today()+timedelta(days=i)foriinrange(10)]x[5]=Nonex[-1]=Noneplt.plot(x,y)# worksplt.show()x[0]=Noneplt.plot(x,y)# TypeErrorplt.show()

Traceback (most recent call last):  File "pyplot_test.py", line 17, in <module>    plt.plot(x, y)  File "<python_path>\lib\site-packages\matplotlib\pyplot.py", line 2769, in plot    return gca().plot(  File "<python_path>\lib\site-packages\matplotlib\axes\_axes.py", line 1634, in plot    self.add_line(line)  File "<python_path>\lib\site-packages\matplotlib\axes\_base.py", line 2288, in add_line    self._update_line_limits(line)  File "<python_path>\lib\site-packages\matplotlib\axes\_base.py", line 2311, in _update_line_limits    path = line.get_path()  File "<python_path>\lib\site-packages\matplotlib\lines.py", line 999, in get_path    self.recache()  File "<python_path>\lib\site-packages\matplotlib\lines.py", line 652, in recache    x = _to_unmasked_float_array(xconv).ravel()  File "<python_path>\lib\site-packages\matplotlib\cbook\__init__.py", line 1298, in _to_unmasked_float_array    return np.asarray(x, float)  File "<python_path>\lib\site-packages\numpy\core\_asarray.py", line 85, in asarray    return array(a, dtype, copy=False, order=order)TypeError: float() argument must be a string or a number, not 'datetime.date'