[問題] 請問 matplotlib 要如何 show()

[hardliner (liner)]

$HOME=/root
CONFIGDIR=/root/.matplotlib
matplotlib data path
/usr/local/lib/python2.6/site-packages/matplotlib/mpl-data
loaded rc file /root/.matplotlib/matplotlibrc
matplotlib version 0.98.5.2
verbose.level helpful
interactive is False
units is False
platform is linux2
Using fontManager instance from /root/.matplotlib/fontList.cache
backend Agg version v2.2

以上的訊息是我照 manual 上所指示所得到的訊息，下面是我測試的內容。

from pylab import *
plot([1,2,3])
show()

>>> from pylab import *
>>> plot([1,2,3])
[<matplotlib.lines.Line2D object at 0x8bceeac>]
>>> show()
/usr/local/lib/python2.6/site-packages/matplotlib/backends/__init__.py:41:
UserWarning:
Your currently selected backend, 'Agg' does not support show().
Please select a GUI backend in your matplotlibrc file
('/root/.matplotlib/matplotlibrc')
or with matplotlib.use()
  (backend, matplotlib.matplotlib_fname()))

由於問題出在 backend，看起來是指 Agg 不支援 show()，而搜尋相關網頁，
只找到一篇是使用 WXAgg（http://0rz.tw/WcgOw），於是我安裝了 wxPython，
vi ~/.matplotlib/matplotlibrc，更改其內容為下
backend        : WXAgg

可是更改之後，卻連 import 都不行了。

>>> from pylab import *
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.6/site-packages/pylab.py", line 1, in <module>
    from matplotlib.pylab import *
  File "/usr/local/lib/python2.6/site-packages/matplotlib/pylab.py", line
253, in <module>
    from matplotlib.pyplot import *
  File "/usr/local/lib/python2.6/site-packages/matplotlib/pyplot.py", line
75, in <module>
    new_figure_manager, draw_if_interactive, show = pylab_setup()
  File
"/usr/local/lib/python2.6/site-packages/matplotlib/backends/__init__.py",
line 25, in pylab_setup
    globals(),locals(),[backend_name])
  File
"/usr/local/lib/python2.6/site-packages/matplotlib/backends/backend_wxagg.py",
line 19, in <module>
    import wx
ImportError: No module named wx

請問問題是出在哪裡呢？謝謝。

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