Can't use list_plot in Jupyter notebook due to fast_float import failure

[bbarker]

import sage.plot.list_plot

​

ImportError                               Traceback (most recent call last)
<ipython-input-2-4c90177ccd9f> in <module>()
----> 1 import sage.plot.list_plot

/usr/local/sage/sage-6.5/local/lib/python2.7/site-packages/sage/plot/__init__.py in <module>()
----> 1 import all

/usr/local/sage/sage-6.5/local/lib/python2.7/site-packages/sage/plot/all.py in <module>()
      1 from graphics import show_default, Graphics
----> 2 from plot import plot, graphics_array, list_plot, parametric_plot, polar_plot
      3 from plot import plot_loglog, plot_semilogx, plot_semilogy
      4 from plot import list_plot_loglog, list_plot_semilogx, list_plot_semilogy
      5 from line import line, line2d

/usr/local/sage/sage-6.5/local/lib/python2.7/site-packages/sage/plot/plot.py in <module>()
    396 from math import sin, cos, pi #for polar_plot
    397 
--> 398 from sage.ext.fast_eval import fast_float, fast_float_constant, is_fast_float
    399 
    400 from sage.misc.decorators import options, rename_keyword

ImportError: cannot import name fast_float