title: why matplotlib give the error [<matplotlib.lines.Line2D object at 0x0392A9D0>]?
body: <p>I am using python 2.7.9 on win8. When I tried to plot using matplotlib, the following error showed up:</p>
  
  <blockquote>
    <p>from pylab import *<br>
    plot([1,2,3,4])</p>
    
    <p><strong>[matplotlib.lines.Line2D object at 0x0392A9D0]</strong></p>
  </blockquote>
  
  <p>I tried the test code "python simple_plot.py --verbose-helpful", and the following warning showed up:</p>
  
  <blockquote>
    <p>$HOME=C:\Users\XX
    matplotlib data path C:\Python27\lib\site-packages\matplotlib\mpl-data</p>
    
    <hr>
    
    <p>You have the following UNSUPPORTED LaTeX preamble customizations:</p>
    
    <p>Please do not ask for support with these customizations active.</p>
    
    <hr>
    
    <p>loaded rc file C:\Python27\lib\site-packages\matplotlib\mpl-data\matplotlibrc
    matplotlib version 1.4.3
    verbose.level helpful
    interactive is False
    platform is win32
    CACHEDIR=C:\Users\XX.matplotlib
    Using fontManager instance from C:\Users\XX.matplotlib\fontList.cache
    backend TkAgg version 8.5
    findfont: Matching :family=sans-serif:style=normal:variant=normal:weight=normal:stretch=normal:size=medium to Bitstream
    Vera Sans (u'C:\Python27\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf') with score of 0.000000</p>
  </blockquote>
  
  <p>What does this mean? How could I get matplotlib working?</p>