python 调试 jupyter,调试 – 使用ipdb调试python代码在一个单元格(jupyter或Ipython)

我使用带有firefox的jupyter(或Ipython)笔记本，并希望调试单元格中的一些python代码。我使用’import ipdb; ipdb.set_trace()’作为断点类型，例如我的单元有以下代码：

a=4

import ipdb; ipdb.set_trace()

b=5

print a

print b

在用Shift Enter执行后给我这个错误：

--------------------------------------------------------------------------

MultipleInstanceError Traceback (most recent call last)

in ()

1 a=4

----> 2 import ipdb; ipdb.set_trace()

3 b=5

4 print a

5 print b

/home/nnn/anaconda/lib/python2.7/site-packages/ipdb/__init__.py in ()

14 # You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

15

---> 16 from ipdb.__main__ import set_trace, post_mortem, pm, run, runcall, runeval, launch_ipdb_on_exception

17

18 pm # please pyflakes

/home/nnn/anaconda/lib/python2.7/site-packages/ipdb/__main__.py in ()

71 # the instance method will create a new one without loading the config.

72 # i.e: if we are in an embed instance we do not want to load the config.

---> 73 ipapp = TerminalIPythonApp.instance()

74 shell = get_ipython()

75 def_colors = shell.colors

/home/nnn/anaconda/lib/python2.7/site-packages/traitlets/config/configurable.pyc in instance(cls, *args, **kwargs)

413 raise MultipleInstanceError(

414 'Multiple incompatible subclass instances of '

--> 415 '%s are being created.' % cls.__name__

416 )

417

MultipleInstanceError: Multiple incompatible subclass instances of TerminalIPythonApp are being created.

如果我使用这个代码不在jupyter笔记本在浏览器，但在jupyter qtconsole中出现同样的错误。

这个错误是什么意思和做什么来避免它？

是否可以使用pdb调试器的next，continue等命令逐步调试单元中的代码？