[Python] Error when "import matplotlib.pyplot as plt"

I did not have any problem to use "plt", but it suddenly shows an error message and does not work, when I import it. Please see the below.

>>> import matplotlib
>>> import matplotlib.pyplot as plt


Output:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib64/python2.6/site-packages/matplotlib/pyplot.py", line 6, in <module>
from matplotlib.figure import Figure, figaspect
File "/usr/lib64/python2.6/site-packages/matplotlib/figure.py", line 18, in <module>
from axes import Axes, SubplotBase, subplot_class_factory
File "/usr/lib64/python2.6/site-packages/matplotlib/axes.py", line 2, in <module>
import math, sys, warnings, datetime, new
File "new.py", line 12, in <module>
import matplotlib.pyplot as plt
AttributeError: 'module' object has no attribute 'pyplot'


This package is suddenly corrupted. So, I tried to install as below. I use Ubuntu.

In [1]: sudo apt-get install python-matplotlib
File "<ipython-input-1-2400ac877ebd>", line 1
sudo apt-get install python-matplotlib
^
SyntaxError: invalid syntax


If I need to reinstall, what are the detailed instructions on how to do it?

I am very new to Python. So, my problem might be too simple to be solved. But I cannot.

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