can not import hashlib

[ch huang]

i have a big problem,here is
and any can help me?

Python 2.6.5 (r265:79063, Apr  1 2010, 05:22:20)
[GCC 4.4.3 20100316 (prerelease)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import hashlib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/hashlib.py", line 136, in <module>
    md5 = __get_builtin_constructor('md5')
  File "/usr/lib/python2.6/hashlib.py", line 63, in
__get_builtin_constructor
    import _md5
ImportError: No module named _md5
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