问题
I am getting error on the following python code. I'm running from a script. Im using python 2.7.12.
import os
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
from IPython import get_ipython
ipython_shell = get_ipython()
get_ipython().run_line_magic('matplotlib', 'inline')
I have tried using both py and jpy extensions. Tried to change the syntax for importing matplotlib but nothing works.
The error from running with python shows
Traceback (most recent call last):
File "LR.jpy", line 7, in <module>
get_ipython().run_line_magic('matplotlib', 'inline')
AttributeError: 'NoneType' object has no attribute 'run_line_magic'
Error from running with iPython shows
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
C:\Users\Roland\Google Drive\Work\Machine Learning\machine-learning-ex1\ex1\LR.jpy in <module>()
5 from IPython import get_ipython
6 ipython_shell = get_ipython()
----> 7 get_ipython().run_line_magic('matplotlib', 'inline')
c:\program files\python\lib\site-packages\IPython\core\interactiveshell.pyc in run_line_magic(self, magic_name, line)
2077 kwargs['local_ns'] = sys._getframe(stack_depth).f_locals
2078 with self.builtin_trap:
-> 2079 result = fn(*args,**kwargs)
2080 return result
2081
<decorator-gen-105> in matplotlib(self, line)
c:\program files\python\lib\site-packages\IPython\core\magic.pyc in <lambda>(f, *a, **k)
186 # but it's overkill for just that one bit of state.
187 def magic_deco(arg):
--> 188 call = lambda f, *a, **k: f(*a, **k)
189
190 if callable(arg):
c:\program files\python\lib\site-packages\IPython\core\magics\pylab.pyc in matplotlib(self, line)
98 print("Available matplotlib backends: %s" % backends_list)
99 else:
--> 100 gui, backend = self.shell.enable_matplotlib(args.gui)
101 self._show_matplotlib_backend(args.gui, backend)
102
c:\program files\python\lib\site-packages\IPython\core\interactiveshell.pyc in enable_matplotlib(self, gui)
2945 gui, backend = pt.find_gui_and_backend(self.pylab_gui_select)
2946
-> 2947 pt.activate_matplotlib(backend)
2948 pt.configure_inline_support(self, backend)
2949
c:\program files\python\lib\site-packages\IPython\core\pylabtools.pyc in activate_matplotlib(backend)
293
294 import matplotlib.pyplot
--> 295 matplotlib.pyplot.switch_backend(backend)
296
297 # This must be imported last in the matplotlib series, after
c:\program files\python\lib\site-packages\matplotlib\pyplot.pyc in switch_backend(newbackend)
230 matplotlib.use(newbackend, warn=False, force=True)
231 from matplotlib.backends import pylab_setup
--> 232 _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
233
234
c:\program files\python\lib\site-packages\matplotlib\backends\__init__.pyc in pylab_setup()
30 # imports. 0 means only perform absolute imports.
31 backend_mod = __import__(backend_name,
---> 32 globals(),locals(),[backend_name],0)
33
34 # Things we pull in from all backends
ImportError: No module named ipykernel.pylab.backend_inline
EDIT:
After installing ipykernel trying to run the script using ipython gives me followng errors
---------------------------------------------------------------------------
UnknownBackend Traceback (most recent call last)
C:\Users\Roland\Google Drive\Work\Machine Learning\machine-learning-ex1\ex1\LR.py in <module>()
5 from IPython import get_ipython
6 ipython_shell = get_ipython()
----> 7 get_ipython().run_line_magic('matplotlib', 'inline')
c:\program files\python\lib\site-packages\IPython\core\interactiveshell.pyc in run_line_magic(self, magic_name, line)
2077 kwargs['local_ns'] = sys._getframe(stack_depth).f_locals
2078 with self.builtin_trap:
-> 2079 result = fn(*args,**kwargs)
2080 return result
2081
<decorator-gen-105> in matplotlib(self, line)
c:\program files\python\lib\site-packages\IPython\core\magic.pyc in <lambda>(f, *a, **k)
186 # but it's overkill for just that one bit of state.
187 def magic_deco(arg):
--> 188 call = lambda f, *a, **k: f(*a, **k)
189
190 if callable(arg):
c:\program files\python\lib\site-packages\IPython\core\magics\pylab.pyc in matplotlib(self, line)
98 print("Available matplotlib backends: %s" % backends_list)
99 else:
--> 100 gui, backend = self.shell.enable_matplotlib(args.gui)
101 self._show_matplotlib_backend(args.gui, backend)
102
c:\program files\python\lib\site-packages\IPython\core\interactiveshell.pyc in enable_matplotlib(self, gui)
2950 # Now we must activate the gui pylab wants to use, and fix %run to take
2951 # plot updates into account
-> 2952 self.enable_gui(gui)
2953 self.magics_manager.registry['ExecutionMagics'].default_runner = \
2954 pt.mpl_runner(self.safe_execfile)
c:\program files\python\lib\site-packages\IPython\terminal\interactiveshell.pyc in enable_gui(self, gui)
450 def enable_gui(self, gui=None):
451 if gui:
--> 452 self._inputhook = get_inputhook_func(gui)
453 else:
454 self._inputhook = None
c:\program files\python\lib\site-packages\IPython\terminal\pt_inputhooks\__init__.pyc in get_inputhook_func(gui)
36
37 if gui not in backends:
---> 38 raise UnknownBackend(gui)
39
40 if gui in aliases:
UnknownBackend: No event loop integration for u'inline'. Supported event loops are: qt, qt4, qt5, gtk, gtk2, gtk3, tk, wx, pyglet, glut, osx
回答1:
In the first case, you only get back a non-none instance if you are running IPython
Help on function get_ipython in module IPython.core.getipython:
get_ipython()
Get the global InteractiveShell instance.
Returns None if no InteractiveShell instance is registered.
In the second case, the inline backend is shipped as part of ipykernel which you may not have installed. The inline backend only works in the notebook and qtconsole, not the normal prompt.
回答2:
My problem was in terminal it is impossible to show the plot images. I needed to use jupyter notebook. I installed jupyter notebook and ran it with the following command.
jupyter notebook
After that a new tab in the browser opens. There is a New button in the top right corner.
There I selected the python 2. In a new tab there are cells. And on each cell, codes can be pasted and run. That solved the problem for me.
来源：https://stackoverflow.com/questions/40721660/error-executing-python-script-attributeerror-nonetype-object-has-no-attribute