[Python-modules-team] Bug#793365: ipython should recommend python-pygments

[Javi Merino]

Package: ipython
Version: 2.3.0-2
Severity: normal

Hi,

After installing ipython, "ipython nbconvert" fails with an
ImportError:


$ ipython nbconvert --to=html Untitled0.ipynb                                                        
[NbConvertApp] Created profile dir: u'/root/.ipython/profile_default'
Traceback (most recent call last):
  File "/usr/bin/ipython", line 5, in <module>
    start_ipython()
  File "/usr/lib/python2.7/dist-packages/IPython/__init__.py", line 120, in start_ipython
    return launch_new_instance(argv=argv, **kwargs)
  File "/usr/lib/python2.7/dist-packages/IPython/config/application.py", line 565, in launch_instance
    app.start()
  File "/usr/lib/python2.7/dist-packages/IPython/terminal/ipapp.py", line 367, in start
    return self.subapp.start()
  File "/usr/lib/python2.7/dist-packages/IPython/nbconvert/nbconvertapp.py", line 268, in start
    self.convert_notebooks()
  File "/usr/lib/python2.7/dist-packages/IPython/nbconvert/nbconvertapp.py", line 284, in convert_notebooks
    exporter = exporter_map[self.export_format](config=self.config)
  File "/usr/lib/python2.7/dist-packages/IPython/nbconvert/exporters/templateexporter.py", line 151, in __init__
    super(TemplateExporter, self).__init__(config=config, **kw)
  File "/usr/lib/python2.7/dist-packages/IPython/nbconvert/exporters/exporter.py", line 94, in __init__
    self._init_preprocessors()
  File "/usr/lib/python2.7/dist-packages/IPython/nbconvert/exporters/exporter.py", line 222, in _init_preprocesso
rs
    self.register_preprocessor(preprocessor)
  File "/usr/lib/python2.7/dist-packages/IPython/nbconvert/exporters/exporter.py", line 188, in register_preprocessor
    return self.register_preprocessor(preprocessor_cls, enabled)
  File "/usr/lib/python2.7/dist-packages/IPython/nbconvert/exporters/exporter.py", line 201, in register_preprocessor
    self.register_preprocessor(preprocessor(parent=self), enabled)
  File "/usr/lib/python2.7/dist-packages/IPython/nbconvert/preprocessors/csshtmlheader.py", line 54, in __init__
    self._regen_header()
  File "/usr/lib/python2.7/dist-packages/IPython/nbconvert/preprocessors/csshtmlheader.py", line 84, in _regen_header
    from pygments.formatters import HtmlFormatter
ImportError: No module named pygments.formatters


The ipython package should recommend python-pygments to prevent this
error.