Banner for IPython widgets with pylab message

def long_banner(self):
        """Banner for IPython widgets with pylab message"""
        # Default banner
        try:
            from IPython.core.usage import quick_guide
        except Exception:
            quick_guide = ''
        banner_parts = [
            'Python %s\n' % self.interpreter_versions['python_version'],
            'Type "copyright", "credits" or "license" for more information.\n\n',
            'IPython %s -- An enhanced Interactive Python.\n' % \
            self.interpreter_versions['ipython_version'],
            quick_guide
        ]
        banner = ''.join(banner_parts)

        # Pylab additions
        pylab_o = self.additional_options['pylab']
        autoload_pylab_o = self.additional_options['autoload_pylab']
        mpl_installed = programs.is_module_installed('matplotlib')
        if mpl_installed and (pylab_o and autoload_pylab_o):
            pylab_message = ("\nPopulating the interactive namespace from "
                             "numpy and matplotlib\n")
            banner = banner + pylab_message

        # Sympy additions
        sympy_o = self.additional_options['sympy']
        if sympy_o:
            lines = """
These commands were executed:
>>> from __future__ import division
>>> from sympy import *
>>> x, y, z, t = symbols('x y z t')
>>> k, m, n = symbols('k m n', integer=True)
>>> f, g, h = symbols('f g h', cls=Function)
"""
            banner = banner + lines
        if (pylab_o and sympy_o):
            lines = """
Warning: pylab (numpy and matplotlib) and symbolic math (sympy) are both 
enabled at the same time. Some pylab functions are going to be overrided by 
the sympy module (e.g. plot)
"""
            banner = banner + lines
        return banner