Python can'；找不到pygments.lexers.BashLexer

我想用

jupyter nbconvert example.ipynb --to slides

要从ipython笔记本生成jsreveal幻灯片，但我一直从lexers.py中得到一个错误：

File "/usr/local/lib/python2.7/dist-packages/IPython/lib/lexers.py", line 37, in <module>
from pygments.lexers import BashLexer, PythonLexer, Python3Lexer
ImportError: cannot import name BashLexer

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在本例中，问题出在我的.bashrc中，它是为与paraview一起使用而设置的，如果我注释掉pythonpath，那么pygments可以正常工作

return self.preprocess(nb,resources)
File "/usr/local/lib/python2.7/dist-packages/nbconvert/preprocessors/latex.py", line 43, in preprocess
from pygments.formatters import LatexFormatter
ImportError: cannot import name LatexFormatter