解决问题
import matplotlib; matplotlib.use('Agg') # pylint: disable=multiple-statements
The backend was *originally* set to 'module://ipykernel.pylab.backend_inline' by the following code:
File "f:\program files\python\python36\lib\runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "f:\program files\python\python36\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "F:\Program Files\Python\Python36\Lib\site-packages\ipykernel_launcher.py", line 16, in <module>
app.launch_new_instance()
File "F:\Program Files\Python\Python36\Lib\site-packages\traitlets\config\application.py", line 658, in launch_instance
app.start()
File "F:\Program Files\Python\Python36\Lib\site-packages\ipykernel\kernelapp.py", line 486, in start
self.io_loop.start()
File "F:\Program Files\Python\Python36\Lib\site-packages\tornado\platform\asyncio.py", line 127, in start
self.asyncio_loop.run_forever()
File "f:\program files\python\python36\lib\asyncio\base_events.py", line 421, in run_forever
self._run_once()
File "f:\program files\python\python36\lib\asyncio\base_events.py", line 1431, in _run_once
handle._run()
File "f:\program files\python\python36\lib\asyncio\events.py", line 145, in _run
self._callback(*self._args)
File "F:\Program Files\Python\Python36\Lib\site-packages\tornado\platform\asyncio.py", line 117, in _handle_events
handler_func(fileobj, events)
File "F:\Program Files\Python\Python36\Lib\site-packages\tornado\stack_context.py", line 276, in null_wrapper
return fn(*args, **kwargs)
File "F:\Program Files\Python\Python36\Lib\site-packages\zmq\eventloop\zmqstream.py", line 450, in _handle_events
self._handle_recv()
File "F:\Program Files\Python\Python36\Lib\site-packages\zmq\eventloop\zmqstream.py", line 480, in _handle_recv
self._run_callback(callback, msg)
File "F:\Program Files\Python\Python36\Lib\site-packages\zmq\eventloop\zmqstream.py", line 432, in _run_callback
callback(*args, **kwargs)
File "F:\Program Files\Python\Python36\Lib\site-packages\tornado\stack_context.py", line 276, in null_wrapper
return fn(*args, **kwargs)
File "F:\Program Files\Python\Python36\Lib\site-packages\ipykernel\kernelbase.py", line 283, in dispatcher
return self.dispatch_shell(stream, msg)
File "F:\Program Files\Python\Python36\Lib\site-packages\ipykernel\kernelbase.py", line 233, in dispatch_shell
handler(stream, idents, msg)
File "F:\Program Files\Python\Python36\Lib\site-packages\ipykernel\kernelbase.py", line 399, in execute_request
user_expressions, allow_stdin)
File "F:\Program Files\Python\Python36\Lib\site-packages\ipykernel\ipkernel.py", line 208, in do_execute
res = shell.run_cell(code, store_history=store_history, silent=silent)
File "F:\Program Files\Python\Python36\Lib\site-packages\ipykernel\zmqshell.py", line 537, in run_cell
return super(ZMQInteractiveShell, self).run_cell(*args, **kwargs)
File "F:\Program Files\Python\Python36\Lib\site-packages\IPython\core\interactiveshell.py", line 2662, in run_cell
raw_cell, store_history, silent, shell_futures)
File "F:\Program Files\Python\Python36\Lib\site-packages\IPython\core\interactiveshell.py", line 2785, in _run_cell
interactivity=interactivity, compiler=compiler, result=result)
File "F:\Program Files\Python\Python36\Lib\site-packages\IPython\core\interactiveshell.py", line 2909, in run_ast_nodes
if self.run_code(code, result):
File "F:\Program Files\Python\Python36\Lib\site-packages\IPython\core\interactiveshell.py", line 2963, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "<ipython-input-2-0f0a85121700>", line 2, in <module>
get_ipython().run_line_magic('matplotlib', 'inline')
File "F:\Program Files\Python\Python36\Lib\site-packages\IPython\core\interactiveshell.py", line 2131, in run_line_magic
result = fn(*args,**kwargs)
File "<decorator-gen-108>", line 2, in matplotlib
File "F:\Program Files\Python\Python36\Lib\site-packages\IPython\core\magic.py", line 187, in <lambda>
call = lambda f, *a, **k: f(*a, **k)
File "F:\Program Files\Python\Python36\Lib\site-packages\IPython\core\magics\pylab.py", line 99, in matplotlib
gui, backend = self.shell.enable_matplotlib(args.gui)
File "F:\Program Files\Python\Python36\Lib\site-packages\IPython\core\interactiveshell.py", line 3051, in enable_matplotlib
pt.activate_matplotlib(backend)
File "F:\Program Files\Python\Python36\Lib\site-packages\IPython\core\pylabtools.py", line 311, in activate_matplotlib
matplotlib.pyplot.switch_backend(backend)
File "F:\Program Files\Python\Python36\Lib\site-packages\matplotlib\pyplot.py", line 231, in switch_backend
matplotlib.use(newbackend, warn=False, force=True)
File "F:\Program Files\Python\Python36\Lib\site-packages\matplotlib\__init__.py", line 1410, in use
reload(sys.modules['matplotlib.backends'])
File "f:\program files\python\python36\lib\importlib\__init__.py", line 166, in reload
_bootstrap._exec(spec, module)
File "F:\Program Files\Python\Python36\Lib\site-packages\matplotlib\backends\__init__.py", line 16, in <module>
line for line in traceback.format_stack()
import matplotlib; matplotlib.use('Agg') # pylint: disable=multiple-statements
解决思路
原因之一，在最新的一个matplotlib版本中，此导入的方式不对。
有网友说还可能存在其他原因，如有其他解决办法，欢迎网友留言！
解决方法
尝试，将
from matplotlib import pyplot as plt
改为
import matplotlib.pyplot as plt
